Tau'ri-Goa'uld skirmishes

This is a list of skirmishes that have occurred in the Milky Way galaxy between the Tau'ri and the Goa'uld during the Goa'uld dominance over the Galaxy.

Apophis' attack on Stargate Command
As five United States Air Force Airman are playing poker, Apophis and several Jaffa led by his First Prime Teal'c arrive on Earth through the Stargate on a mission to search for hosts. The group captures Senior Airman Carol Weterings and enter a firefight with the other four Airman. In the fight, one Jaffa is killed and so are all of the other airmen before Apophis, Teal'c and his remaining Jaffa retreat through the Stargate. As they leave, Major General George S. Hammond runs into the room with more men and witnesses Apophis' eyes glow, causing him to believe that Ra survived.

Skirmish on Abydos
The appearance of Apophis in Stargate Command and the revealing of the fact that Dr. Daniel Jackson and the people of Abydos surviving causes Major General George S. Hammond to send another team to Abydos led by Colonel Jack O'Neill and including Captain Samantha Carter, Major Charles Kawalsky and Major Louis Ferretti. As the team is shown a massive cartouche of Stargate addresses, Apophis and his men arrive through the Stargate on another hunt for hosts. The Earth team and the Abydonian militia engage the Jaffa, but are defeated. Skaara tries to stop them from taking Sha're and is captured by Teal'c who is interested in him as he's using an Earth weapon and he and Sha're are taken through the Stargate, but Ferretti, badly injured but still conscious, manages to see the Stargate address Apophis dials. As a result of the attack, Jackson willingly returns to Earth in hopes of being able to rescue Sha're and Skaara.

Skirmish on Chulak
After the attack on Abydos, Earth learns the location of Chulak from Major Louis Ferretti who saw where Apophis and his men dialed when they left Abydos. In an attempt to learn more about this new enemy and rescue Sha're and Skaara, the newly formed SG-1 and SG-2 led by Colonel Jack O'Neill and Major Charles Kawalsky travel there. After being mistaken for Goa'uld's looking for hosts, SG-1 are taken to the main city while SG-2 stays behind. At the city, Apophis arrives with Sha're now host to his queen Amaunet. When Dr. Daniel Jackson tries to reach Sha're, he is thrown away by Apophis's Kara kesh and O'Neill tries to shoot Apophis but hesitates when Amaunet steps in the way and is knocked out.

After waking up, Apophis and other Goa'ulds arrive to choose from the prisoners who will be a host and among them Skaara is chosen. After the newly selected hosts are taken away, Apophis orders his men to kill the remaining prisoners before leaving, but O'Neill convinces Apophis' First Prime Teal'c to help him and Teal'c shoots one of the guards before tossing O'Neill his Staff weapon. Together they kill the guards in the room and scare off the ones outside before O'Neill uses the staff weapon to blow a hole in the outside wall for them and the prisoners to escape through. At first Teal'c stays behind as due to his betrayal he has nowhere to go, but O'Neill invites him to come with them.

As the group travels to the Stargate, they come under attack by a Death Glider and O'Neill and Teal'c try to shoot it down with their staff weapons to no avail until Major Carl Warren from SG-2 takes it out from nearby with a FIM-92 Stinger missile. The group reaches the Stargate where O'Neill tries to reach Skaara, but Skaara now has a Goa'uld implanted in him and throws him back with his Kara kesh before leaving with the other Goa'uld including Apophis and Amaunet through the Stargate. O'Neill misses the address so the group has no way of following them.

As the group prepares to dial Earth, a Jaffa battalion arrives and Warren and Casey shoot at them, trying to hold them off, but are eventually forced to fall back. Jackson manages to dial the Stargate and Captain Samantha Carter sends the IDC just in time as the Iris is about to be permanently closed. Jackson and Carter usher the former prisoners through the Stargate as the others hold off the Jaffa as best they can. When the Jaffa reach the top of a nearby hill, the Kawalsky triggers A-M18A1 Claymore mines laid there killing a bunch of Jaffa, but more keep coming. Jackson gets all of the prisoners through the Stargate and goes through himself, but as everyone else follows, Casey is hit by a staff blast and wounded. As Kawalsky helps him to the Stargate, one of the prisoners squeezes one of the Jaffa to death and his symbiote enters Kawalsky as he passes nearby. Everyone gets through the Stargate and the iris is closed, taking out the remaining Jaffa who try to follow.

Charles Kawalsky's infestation by a Goa'uld
While escaping from Chulak, Major Charles Kawalsky is infected with a Goa'uld who can only take control of him periodically as its still not completely mature. Complaining of a headache, Kawalsky visits Dr. Nimzicki, but the Goa'uld takes control and kills him when the doctor finds the spot that the Goa'uld entered through. Later, when Dr. William Warner does an MRI and discovers it, the Goa'uld takes control again and escapes as Warner activates the alarm.

The Goa'uld travels to the Stargate Operations room where it beats up the technicians and tries to dial the Stargate, but is found by Captain Samantha Carter who it takes hostage and uses to get into an elevator that it starts to take to the surface. The Goa'uld throws Carter against a wall, knocking her out, but before it can do anymore, Kawalsky regains control with no memory of what happened and stops the elevator upon seeing Carter hurt. Kawalsky is strapped down and after the idea of trying to surgically remove the Goa'uld is revealed as dangerous by Teal'c as the Goa'uld will likely kill the host if its tried, the Goa'uld is offered its freedom in exchange for leaving Kawalsky permanently. It refuses and its decided to try to surgically remove the Goa'uld. Using an anesthetic picked out by experimenting on Teal'c's Goa'uld, the operation goes ahead and the Goa'uld is removed with apparently no ill effects for Kawalsky. However, the Goa'uld has in reality gained permanent control over Kawalsky's body and claiming to want to thank Teal'c, approaches him offering to serve it and when he refuses, it briefly chokes him before knocking out the guards outside and heading to the Control Room.

In the Control Room, it injures MSgt. Walter Harriman and dials the Stargate to Chulak, setting the base Self-destruct at the same time. The Goa'uld tries to escape through the Stargate, but is stopped by Teal'c who fights him in front of the Gate. Colonel Jack O'Neill and Major General George S. Hammond deactivate the self-destruct before O'Neill has Teal'c hold Kawalsky's head partially in the event horizon then has Harriman shut down the Stargate, cutting off part of the top of Kawalsky's head, killing him and the Goa'uld who is revealed to have still had a piece of itself in Kawalsky's head which falls out and shrivels up when Kawalsky is killed.

Skirmish on Gaia
Looking for technologies that could help them in their fight against the Goa'uld, SG-1 travel to the planet Gaia looking to capture a Fenri, believing it has the ability to become invisible and will thus give them an advantage over the Goa'uld if they can figure out how and replicate the effect for themselves. After the Stargate disappears, SG-1 begins a search for it, but locate an invisible Fenri instead. As Colonel Jack O'Neill is about to shoot it with a tranquilizer gun, it is scared off by a staff weapon blast and they find Apophis with three Jaffa also hunting the creature. Realizing they have the element of surprise and all that they can learn if they capture him, SG-1 decide to take out the Jaffa and capture Apophis. Waiting for a moment when the group is distracted, Dr. Daniel Jackson, Teal'c and Captain Samantha Carter start a firefight with the Jaffa while O'Neill goes after Apophis with his tranquilizer gun. However, while O'Neill is able to shoot at Apophis, he surprises him by using the personal shield attached to his kara kesh to block the dart and has one of his Jaffa toss him a staff weapon. After bullets also fail to penetrate Apophis' shield, O'Neill dives for cover, but Apophis shoots and kills him. When Carter goes to help O'Neill, Apophis kills her and then Jackson when he also tries to help. Teal'c manages to injure Shak'l, but his staff weapon also fails to penetrate Apophis' shield. Declaring "I die free," Teal'c prepares to die, but disappears before Apophis can shoot.

SG-1 and Shak'l are taken by the Nox who resurrect SG-1 and try and fail to help Shak'l but take away everyone's weapons. The Nox explain what they've done, but refuse to allow SG-1 to have their weapons back or to kill Shak'l who's Goa'uld can heal his injuries and place the Nox in danger when Apophis learns of their existence. SG-1 decides to try to take Shak'l back to Earth with them to keep him from telling Apophis about the Nox, but as it will be difficult to get past Apophis even if they can find the Stargate, they decide to learn about the Nox first. After O'Neill fires at a Fenri with a bow and arrow he makes to protect Nafrayu, he learns that its actually the Nox and not the Fenri that have the ability to become invisible. The Nox make the Fenri invisible to protect them from outsiders which makes them more of a target for the Goa'uld if they learn about the Nox's existence as Apophis will try to capture the Nox or will destroy them from orbit if he can't. While this makes SG-1 more determined than ever to take Shak'l with them to protect the Nox, the Nox refuse as they know SG-1 wants to harm him.

However, Shak'l breaks free, injures Teal'c and kills Lya. The other Nox resurrect her, but both SG-1 and Shak'l learn that the Nox become visible during the ceremony, unable to shield themselves from view while performing a resurrection. Shak'l informs Apophis who kills Nafrayu when he comes to meet him, curious about the Goa'uld. Apophis then allows the Nox to collect the boy so he can wait until the Nox are vulnerable during the resurrection ceremony to attack. Despite the danger, the three adult Nox refuse to go to the other Nox for help or to let SG-1 fight. O'Neill pretends that the team is leaving them to their fate, but really comes up with a plan to attack at close-range with hand-to-hand combat to take down the Jaffa. O'Neill also figures out the weakness to Apophis' shield: while a fast moving object such as a staff weapon blast or a bullet can't get through, a slow-moving one such as a tossed staff weapon or an arrow can. After binding a tranquilizer dart the Nox missed to an arrow, SG-1 hides themselves and attack when Apophis and his Jaffa get close. Teal'c hits a Jaffa with a log and punches him out while Carter attacks a second Jaffa. Teal'c throws Jackson the Jaffa he took down's staff weapon and Jackson kills Shak'l and the Jaffa Carter is fighting with it before that Jaffa can kill her. Apophis tries to flee with his personal shield engaged, but O'Neill confronts him and fires his arrow at him. However, while the arrow goes through the shield, before it can take Apophis out, the Nox make him disappear.

Returning to the Stargate, SG-1 find Anteaus with a resurrected Nafrayu. The two reveal the Nox have resurrected the dead Jaffa and sent them and Apophis back through the Stargate which they make reappear and promise to bury it once SG-1 is gone to keep anyone from coming back. Understanding that SG-1 worries for their safety, Anteaus reveals a giant technologically advanced Floating city, revealing that the Nox were in fact a lot more advanced than they appeared and will be safe from the Goa'uld. However, as a result of the skirmish and the Nox burying the Stargate after SG-1 leave, they can never return to Gaia.

Skirmish on Cimmeria
Wanting to find possible allies against the Goa'uld, SG-1 travels to Cimmeria where something happened in the past that the Goa'uld will not speak of. Once there, the team is scanned for Goa'uld symbiotes by an obelisk and it detects Teal'c's symbiote and starts to beam him into the Labyrinth leading to Thor's Hammer, but Colonel Jack O'Neill grabs on and is beamed in as well. In order to find the two, the rest of the team has Gairwyn take them to Kendra a former Goa'uld host who was freed by Thor's Hammer so she can lead them to where she came out. Kendra is reluctant, but eventually agrees to lead Captain Samantha Carter and Dr. Daniel Jackson to the spot. As O'Neill and Teal'c make their way through the Labyrinth, they find the bones of Goa'ulds and their hosts eaten by the Unas Ruax and their presence wakes him up. He attacks the two, demanding Teal'c kill O'Neill, but O'Neill shoots him, apparently killing him, but Ruax's healing powers keep him alive and he quickly recovers. Ruax catches up and attacks again, but O'Neill and Teal'c shoot again and run, but Ruax quickly recovers.

The two reach the Hammer and O'Neill is able to leave, but the Hammer starts to kill Teal'c's symbiote so O'Neill pulls him out of the beam and the two get ready to face Ruax. The two manage to maneuver Ruax in front of the Hammer and open fire, trying to knock him into the Hammer, but while he's weakened, he manages to keep from falling in so after they run out of ammunition, Teal'c shoves him in and both are affected by the Hammer. O'Neill pulls Teal'c out of the Hammer and the Hammer kills Ruax's Goa'uld. Ruax's host is mortally wounded by O'Neill and Teal'c's gunfire and dies without Ruax to heal it. O'Neill and Teal'c reunite with Jackson, Carter and Kendra and Teal'c is freed when Jackson uses Teal'c's Staff weapon to destroy Thor's Hammer from the outside. In order to protect the people of the planet, the team requests they seal the entrance so any Goa'uld or Jaffa who come to the planet will hopefully be trapped in the Labyrinth.

Back to Chulak
In order to steal a larval Goa'uld for study and to keep Teal'c's son Rya'c from being implanted, SG-1 travels back to Chulak. With Teal'c wearing his old Serpent Guard uniform and the rest of SG-1 wearing priest clothes, they manage to trick the two priests and four Jaffa guards at the Stargate and pass into Chulak undetected. After meeting Bra'tac, Colonel Jack O'Neill, Teal'c and Bra'tac travel to the outcast camp where they believe Teal'c's wife and son are and find Rya'c about to be implanted. Teal'c fights with the Priest doing the ceremony and Drey'auc attempts to stop him. In the struggle, Teal'c throws the priest into a table, smashing the bowl containing the larval Goa'uld and killing it and causing the priest to impale himself on his own knife, killing him too.

Teal'c is horrified to learn that Rya'c is dying of scarlet fever and needed the Goa'uld to survive. O'Neill offers to take Rya'c back to Earth to treat him with Earth medicines and Teal'c, Drey'auc, O'Neill and Bra'tac head for the Stargate with Rya'c. At the same time, Captain Samantha Carter and Dr. Daniel Jackson follow a group of priests to a monastery where they find a tank of larval Goa'uld. They steal one and Jackson kills the rest to keep them from being implanted in anyone in the future. On the way to meet with the others, they are attacked by three Jaffa, but Carter kills them with a fragmentation grenade. Rya'c proves to be too sick to make it to the Stargate and to save him, Teal'c is forced to implant him with his own Goa'uld. Jackson and Carter learn of what Teal'c did when they arrive and give him the Goa'uld they stole to save him. However, more Jaffa find the ones Carter killed and sound a horn, alerting everyone to SG-1's presence including the Jaffa at the Stargate. In response, three of the four guarding Jaffa leave the Stargate to look.

Teal'c says goodbye to Drey'auc and Rya'c planning to leave them in Bra'tac's care and tells Drey'auc to blame him for the death of the priest and claim he tried to kidnap Rya'c in order to protect herself. At the Stargate, Bra'tac pretends to have captured Jackson, Carter and O'Neill while Teal'c dresses as a Serpent Guard again. Bra'tac pretends to want to take SG-1 directly to Apophis, but the priests refuse to let him go through the Stargate until the Palace Guard arrive. Bra'tac pretends to agree and then knocks out the Jaffa and the priests. SG-1 leave through the Stargate while Bra'tac assures them that he will be fine and will look after Rya'c.

Hathor's infiltration of Stargate Command
The Goa'uld Queen, Hathor, who was revived in Mexico in 1998 found her way to the Stargate in Stargate Command. She was detained by SFs when she trespassed into the SGC. Hathor used her breath, which contained Nish'ta-like pheromones to influence her way into the personnel of the SGC, including Major General George S. Hammond, and made Colonel Jack O'Neill as her new First Prime, once she implants him with a symbiote that's one of a batch she creates with the help of Dr. Daniel Jackson. Captain Samantha Carter, Dr. Janet Frasier and the female SFs of the base try and fail to take Hathor down as they can't harm the influenced men who Hathor uses as a shield.

The female members of the SGC are captured, but using the fact that the mens libido has been increased by Hathor's chemical, they seduce their guards, knock them out and escape, rescuing Teal'c (who is immune) and overpowering several airmen and Hammond. They rescue O'Neill and use Hathor's sarcophagus to cure O'Neill of being a Jaffa and return him to normal, but Hathor destroys her own sarcophagus trying to kill them and injures Fraiser and Teal'c. O'Neill leads Carter to hidden tranquilizer guns and they use them to take out the SFs guarding Hathor. Hathor blasts Carter into a wall with her Kara kesh, but before she can do the same to O'Neill, Carter recovers and fires at Hathor with a pistol. Though Hathor is unharmed, the tub she is in with infant Goa'ulds catches on fire, killing the infants. Hathor survives due to her kara kesh's personal shield and defeated, escapes through the Stargate to Chulak. With Hathor gone, her influence over the men of the base is broken.

Nirrti's attack on Hanka and Earth
SG-1 travels to the planet Hanka to watch a black hole through an eclipse only to find the entire population and SG-7 dead. SG-1 call in a medical team led by Dr. Janet Frasier who determine that the population was killed off by a bacterial infection. SG-1, while tagging the bodies of the villagers, locate one survivor, a little girl named Cassandra. Frasier determines that the entire planet has been infected with the bacteria, with it in both the ground and water but not the air. She also determines that SG-1 aren't infected.

Captain Samantha Carter, Dr. Daniel Jackson and Frasier take Cassandra back to Earth and come to believe that they may have caused the deaths on Hanka which are determined to be 1,432 by one of SG-7 possibly bringing a normally harmless bacteria to the planet, it taking on traits from some organism there and then mutating into a very deadly strain of bacteria that killed everyone. As Cassandra seems to be immune, Frasier decides to run tests in hopes of finding a cure for other deadly infections on Earth though they can't figure out why SG-7 didn't report the outbreak. After Cassandra's heart stops and they are forced to restart it with an electric shock, Frasier discovers a strange sound when she listens to the girl's heartbeat and a chest x-ray shows a mysterious object in her chest near her heart. Frasier and Dr. William Warner do a biopsy, getting samples from the object, but are forced to stop the surgery when the object stops Cassandra's heart when they get too close to it.

It is determined that the object is made up of iron and potassium on one side and Naquadah on the other and that the layer between the two is slowly decaying and the two sides will eventually come together so Carter performs an experiment robotically in a lead-lined room in the SGC's subbasement to see what will happen when the two sides come together using microscopic samples of the two sides. The result is a massive explosion that leaves Gamma rays and particle radiation off the scale in the room. As a result, they realize that its a bomb meant to destroy Stargate Command and the Stargate and the whole thing was a set-up from the beginning: the Goa'uld wiped out the people on the planet and kept SG-7 from warning Earth so that Cassandra would be brought back to Earth and designed the device so that it would create itself once on Earth with Frasier theorizing that them giving Cassandra iron supplements when she arrived may have helped create the device and that when they gave her an electric shock to restart her heart, it activated the device. After learning they have just under two hours until the bomb goes off and talking with the President, Major General George S. Hammond decides to send Cassandra back through the Stargate to Hanka so she is no longer a threat to Earth.

At the same time, on Hanka, while viewing the black hole, Colonel Jack O'Neill and Teal'c observe another object through the telescope that turns out to be a Goa'uld Ha'tak ship. Teal'c identifies it as belonging to the Goa'uld Nirrti and figures out the plot based on past experiences: Nirrti once sent a peace emissary to a planet that was contested between her and Apophis, but when the emissary reentered the Stargate to go home, a massive explosion happened that destroyed the Stargate. Teal'c realizes that Nirrti intends the same on Earth using Cassandra and she thus can't be allowed to go through the Stargate. Under attack from Goa'uld Death Gliders, O'Neill and Teal'c manage to dial the Stargate and make it through to Earth just as on Earth they were about to finish dialing the Stargate to Hanka and send through Cassandra who falls into a coma upon approaching the Stargate. O'Neill and Teal'c prevent Cassandra from being sent through and to protect the SGC.

SG-1 takes her to a nearby abandoned nuclear facility to safely explode. Carter takes Cassandra deep underground, but after she wakes up, can't leave her. Cassandra doesn't explode and Carter reveals she realized that Cassandra's proximity to the Stargate was causing the bomb to grow and then explode. Once she was far enough away, the bomb wouldn't detonate anymore. Eventually, the bomb dissipates and is absorbed into Cassandra's system and Frasier adopts her. Later, the SGC sends a team back to Hanka and they cremate the bodies of those who died of the infection. Four years later, when Cassandra starts to go through weird changes, SG-1 returns to Hanka to find that the bacteria is gone and that Nirrti had another reason for wiping out the population: she wanted to hide her experiments to create a hok'tar which were at risk of being exposed with the presence of SG-7.

Apophis' attack on Cartago
Returning to Cartago after Major General George S. Hammond refuses to mount a rescue mission for Teal'c who is sentenced to death by the Byrsa, Captain Samantha Carter and Colonel Jack O'Neill find the Jaffa have arrived to harvest members of the population to be hosts to Goa'uld symbiotes. The Jaffa notice Carter and O'Neill who kill one and take his staff weapon. At the same time, the Jaffa have figured out where the Byrsa's hidings are and cut them off from them. The Byrsa men try to draw the Jaffa away from the children and slowest members of their people with the help of Carter and O'Neill who kills two with a staff weapon, but a few led by Shak'l find the children and Teal'c. One of the children hands Teal'c a knife and he kills Shak'l. Taking a staff weapon, Teal'c takes on the Jaffa who are going after the villagers, shooting one in the back but finding no clean shot on the other two. Seeing one is going to shoot a crowd of helpless villagers, Teal'c dives in the way and takes the shot, tackling the second Jaffa. Before Teal'c can be killed by the last Jaffa, O'Neill kills him with his stolen staff weapon. Teal'c's actions cause Hanno to accept that Teal'c is not the same man who murdered his father and he lets him go. SG-1 offer the Byrsa help in defending themselves from the Goa'uld which they accept.

Skirmish on P4A-771
When SG-1 arrived on P4A-771 they came under fire from Goa'uld staff weapons. They were surrounded so Dr. Daniel Jackson quickly dialed the gate for they could retreat back to Earth. Jackson and Teal'c made it through with Colonel Jack O'Neill and Captain Samantha Carter a little behind them. Right as they were about to go through one of the staff blasts hit the Stargate. This caused Jackson and Teal'c to be launched out of the gate at Stargate Command at such a force it rendered Jackson unconscious and also caused a disruption in the Stargate which sent O'Neill and Carter to the second Stargate on Earth located in Antarctica. While they were trapped there repairs were made on the SGC side and around a day later Major General George S. Hammond sent a MALP back to the planet but there was no sign of O'Neill or Carter and the MALP was quickly destroyed by the staff blasts. Due to this Hammond ordered they that would not attempt to return to the planet for a rescue mission.

Skirmish on Alternate Earth
While on a mission to P3R-233, Dr. Daniel Jackson accidentally activates and uses the Quantum Mirror and is transported to an alternate reality. There, he learns that Earth is under attack by the Goa'uld System Lord Apophis and Washington D.C. and Philadelphia have just been destroyed. Many cities across Europe, Asia and Africa have been destroyed by the Goa'uld and all efforts by the world's militaries to stop the attack have failed. When he arrives, the Goa'uld are starting their attack in the United States of America, going from the East Coast to the West Coast with efficiency and destroying everything and everyone in their wake, leaving no survivors. At that point, the death toll is estimated to be 1.5 billion.

In order to save as many important people such as world leaders, scientists and doctors as they can, the people of SGA begin evacuating them to the Beta Site, but Brigadier General Jack O'Neill, who is in command in that reality, has a nuclear warhead sent through the Stargate to Chulak after being given the coordinates by Jackson in an attempt to stop the attack and strike back. In response, the Goa'uld dial into the Stargate to keep the SGA from dialing out again and escaping or attacking. Air Force One heads for the SGA to bring in the President to be evacuated, but is shot down by a Ha'tak which lands on Cheyenne Mountain to invade the SGA with troops. In response, O'Neill orders the secondary elevator shaft blown and troops positioned to protect the base. Though he wants to send all non-essential personnel to the Beta Site, the Goa'uld wormhole blocking the Stargate prevents it.

While O'Neill and his men defend the SGA, Dr. Samantha Carter agrees to try dialing out when the wormhole closes as she believes it will around half an hour after it first opened. In the meantime, Carter and Dr. Catherine Langford show Jackson a message they received from the people of the P3R-233 of their reality that states "Beware the destroyers. They come from" and then a bunch of numbers they realize represents a Stargate address. Before they can figure out what the Stargate address is, the Stargate shuts down but they aren't able to dial out in time. Carter agrees to try to speed up the dialing process, but they have to wait 38 minutes to be able to try again and they realize they may not have that much time. On Level 2, O'Neill leads a defense against the invading Jaffa who are led by the alternate Teal'c, but eventually his position is overrun and he has to retreat.

When he returns to the SGA Briefing Room, Jackson has figured out the Stargate address in the message where the Goa'uld attack presumably originated from. While O'Neill wants to use the next chance they have to send another bomb through to the address, Jackson wants to use the opportunity to return to his own reality so he can use the information to stop the attack he believes is coming there. He manages to convince O'Neill to help him. Needing to buy more time to get the Stargate open, Jackson convinces O'Neill to try to ask Teal'c for help with stopping the attack so he can return to his world and save it, using the video tape he made of his mission to P3R-233 to show Teal'c that he and O'Neill are friends in an alternate reality. Colonel George S. Hammond and his men prepare to defend the Embarkation room level from the Jaffa to buy more time to open the Stargate and set the self-destruct so the Goa'uld won't capture the SGA intact. O'Neill seems to come close to convincing Teal'c, but when he brings up the fact that the Teal'c from Jackson's reality changed sides to free his family and his people, Teal'c angrily tells him that O'Neill killed his family when he sent his nuclear weapon to Chulak and kills him in revenge.

With only a few minutes left, Hammond and his men are overwhelmed by Jaffa and Carter, who goes to get the Quantum Mirror control, blows herself and a group of Jaffa up with a fragmentation grenade. Jaffa take the Stargate Operations room, presumably killing Catherine just after the Stargate shuts down and she starts dialing P3R-233 while Jaffa try to blast their way into the Gate Room. They eventually succeed and Teal'c gets in, but hesitates when he sees Jackson. The faster dialing program works and the Stargate is successfully dialed to P3R-233. Jackson escapes through the Stargate, but when he runs for it, Teal'c fires at him, hitting him in the shoulder. Seconds after Jackson leaves, the self-destruct goes off, destroying the SGA and killing the Jaffa inside. Afterwards, Earth is presumably conquered by the Goa'uld, but Jackson is able to use the Quantum Mirror to return to his reality where SG-1 uses the information gathered from the alternate reality to avert Apophis' attack on Earth.

Skirmish on Nassya
On the run from the Goa'uld Ashrak Edrekh, the Tok'ra symbiote Jolinar of Malkshur leaves her host and blends with Quinta and hides on the planet Nasya. Edrekh tracks her there and disguises himself as a Nasyan as well to search for Jolinar. When SG-1 arrives on the planet, Edrekh orders a Goa'uld attack and Edrekh is badly burned and taken to Earth. SG-1 helps a group of local Nasyans flee through the Stargate. Captain Samantha Carter stops to give CPR to Quinta. He suddenly grabs her head, and Jolinar possesses her with everyone else unaware of the possession.

Skirmish with Edrekh
Jolinar of Malkshur, now possessing Captain Samantha Carter, travels back to Stargate Command and pretends to be Carter. During an examination by Dr. Janet Fraiser, Fraiser mentions Cassandra Fraiser wanting to see her at the Air Force Academy Hospital tomorrow. The next day Jolinar visits Cassandra, who senses the Naquadah in her blood. After threatening Cassandra, Jolinar returns to Stargate Command for SG-1's next mission. Cassandra informs Colonel Jack O'Neill that Carter is a Goa'uld and he meets her in the Embarkation room and injects her with a sedative but it is not effective. After failing to use a gun to force them to let her go, Jolinar pulls a fragmentation grenade and demands to be let through the Stargate. The drugs finally take effect and she collapses and is taken to the brig.

Edrekh heals his wounds in the Air Force Academy Hospital and awakens and kills Dr. Jacobs and places him in his bed. He begins to search for Jolinar in the Nasyan patients but doesn't find her. Jolinar attempts to explain to O'Neill and Teal'c that she is Tok'ra not Goa'uld and that the System Lords have sent an Ashrak to hunt her but despite her efforts to convince SG-1 to let her go, they refuse to trust her. Edrekh uses his Hara'kesh and stolen uniform to get into the SGC and breaks into the brig. After killing two guards, he uses his hara'kesh to torture Jolinar until O'Neill and Teal'c arrive. He poses as an airman and tells O'Neill Carter is dead and leaves to pursue the killer. O'Neill takes Carter to the infirmary and Teal'c chases Edrekh to the Embarkation room where he takes Dr. Daniel Jackson hostage, trying to get Major General George S. Hammond to let him through the Stargate, but is shot twice by Teal'c with a Zat'nik'tel. Despite Frasier's best efforts, Jolinar dies, but she sacrifices herself to save Carter who survives.

Heru'ur's attack on Cimmeria
After SG-1 destroyed Thor's Hammer to rescue Teal'c from being trapped, the Goa'uld System Lord Heru'ur comes to Cimmeria and takes over the planet to be part of his territory, killing former Goa'uld host Kendra in the process and destroying the Cimmerian's village and most of their farms and killing over half of their people. Following Kendra's last instructions, Gairwyn sends the Sagan Institute Box through the Stargate to Earth in hopes of getting help from the Tau'ri. However, while she survives, her husband and his brothers are killed in the process along with one Jaffa. SG-1 travels to Cimmeria to discover Thor's Hammer destroyed and three pyramid landing pads under construction. Soon after meeting up with Gairwyn, SG-1 comes under attack by Jaffa. They kill two, but are forced to retreat when more show up. Needing to find out more information on Heru'ur and his troops, Colonel Jack O'Neill and Teal'c scout the Jaffa encampment with the help of Olaf, but Olaf is captured by Heru'ur and his Horus Guards. Looking for information on SG-1, Heru'ur starts to torture Olaf with his Kara kesh, but O'Neill and Teal'c kill several of his Jaffa, allowing Olaf to escape. Heru'ur protects himself with his personal shield during the fight, but Teal'c manages to destroy a staff weapon he reaches for causing Heru'ur to order the Stargate to be guarded.

Needing to find a way to stop Heru'ur and his troops before his Ha'tak's arrive, O'Neill, Teal'c and Olaf decide to use claymores to cause as much damage as possible while Captain Samantha Carter, Dr. Daniel Jackson and Gairwyn go to the Hall of Thor's Might which they believe may contain Asgard weapons they can use to defeat the Goa'uld. O'Neill, Teal'c and Olaf engage a Jaffa patrol, killing them with a combination of their weapons and the claymores but leave when another patrol starts coming. As a result of the ambush, the Jaffa start to use an interlacing hunting pattern to locate SG-1 and the Cimmerians and sweep in and corner them. At the same time, Jackson, Carter and Gairwyn manage to pass the Test of Worthiness in the Hall of Might and find out that the reward isn't weapons, but to meet Thor himself in his true form, a Roswell Gray alien. Thor explains that the tests were meant to determine if the Cimmerians were advanced enough to see the Asgard as they really are and is not pleased to learn of the destruction of the Hammer and the fact that the Goa'uld are attacking Cimmeria. However, he does nothing but send Jackson and Carter back to outside the Hall and cause Gairwyn to disappear.

Soon after SG-1 reunites, the Jaffa find the cave where they are hiding with the Cimmerians and demand the surrender of SG-1, proclaiming that otherwise they will kill everyone and if they surrender, the Cimmerians will be allowed to live. Outnumbered twenty to one, SG-1 surrenders to spare the Cimmerians. As the Jaffa escort SG-1 to their encampment, Thor arrives in his ship, the Biliskner and attacks, sending out waves of energy that cause the Jaffa and their encampment to disappear while destroying the pyramids. However, Heru'ur escapes through the Stargate before Thor can get him too. With the invasion over, Thor sends Gairwyn back who explains that Thor has told her to tell SG-1 that the Asgard have visited Earth often and are friends and protectors of all but the Goa'uld who they are at war with. Thor also refuses to meet SG-1 face to face as he believes the Tau'ri are too "young." To protect the Cimmerians from further invasion, Thor will build a new Hammer that will make an exception for Teal'c so he can safely visit Cimmeria and will send an Asgard teacher to help the Cimmerians rebuild.

Apophis' kidnap of Rya'c
Months after Apophis is presumed dead after his attack on Earth, Bra'tac arrives on Earth to announce that Teal'c's son, Rya'c, has been kidnapped by Apophis who is still alive. Bra'tac explains that Apophis and Klorel escaped through Klorel's Ha'tak's Stargate before the ship exploded and that his position is badly weakened as most of the Serpent Guards and warriors loyal to Apophis died on his ships, leaving him with very few loyal Jaffa left. Teal'c realizes that Apophis is trying to lure him into a trap in order to kill him and solidify his position among the Jaffa before the other Goa'uld take advantage of his weakness and send someone to eliminate him. Major General George S. Hammond agrees to allow SG-1 to rescue Rya'c and try to take out Apophis while he is vulnerable on the condition that they bring Teal'c's family back with them this time.

Returning to Chulak, SG-1 send containers of gas through the Stargate first that knock out all the Jaffa guarding it, allowing SG-1 and Bra'tac safe passage through it. Heading to the home of Drey'auc, Teal'c's wife, SG-1 is stunned to find she has divorced him and married his old friend Fro'tak. After Teal'c calms down, they make a plan to rescue Rya'c with Fro'tak's help as he knows the location where Rya'c is being held. Finding guards near Rya'c's room, Bra'tac distracts them and Colonel Jack O'Neill, Captain Samantha Carter and Dr. Daniel Jackson kill all but one with Zat'nik'tels while Teal'c kills the last with his staff weapon. However, instead of being happy to be rescued, Rya'c yells for help, summoning more guards who he runs to. Teal'c kills one of the guards that arrives, but SG-1 and Bra'tac are forced to retreat.

Returning to Fro'tak's house, SG-1 realize that Rya'c has been brainwashed through Nish'ta and now believes in Apophis whole-heartedly. Apophis makes a broadcast in which he places a bounty on Teal'c and SG-1 and has Rya'c denounce Teal'c. During the broadcast, Rya'c asks for help "rescuing" Drey'auc who he says is of the "Morning Chompka Groves. As Drey'auc is really of the Cord'ai Plains, Teal'c takes this to mean that Rya'c has overcome Apophis' brainwashing and is letting them know when and where to rescue him though Bra'tac and O'Neill are suspicious of this as it seems too easy after Rya'c had betrayed them earlier. Before they can do more, Jaffa arrive to search the house and SG-1, Bra'tac and Drey'auc hide while Fro'tak keeps their presence a secret from the Jaffa who leave without finding anything, causing Teal'c to trust Fro'tak though O'Neill and Carter are more wary. After seeing Drey'auc and Teal'c kiss, Fro'tak goes to the palace to betray Teal'c, but O'Neill follows him and kills the Jaffa Fro'tak goes to tell. When Fro'tak pulls a knife on him, O'Neill zats him to try to calm him down, but when Fro'tak refuses to stop, O'Neill is forced to zat him a second time, killing him in order to stop him. In order to hide Fro'tak's presence, O'Neill disintegrates him with a third zat shot and hides as Jaffa find the dead guard and order the palace sealed. Eventually O'Neill escapes and makes it back to Drey'auc's house dressed as a Serpent Guard.

In the morning, SG-1 and Bra'tac travel to the Chompka Groves where five Jaffa guard Rya'c. O'Neill, Carter and Jackson each take out a Jaffa with zat blasts while Teal'c and Bra'tac take one out each with staff weapon blasts. Rya'c reunites with Teal'c, apparently back to normal, but the rest of SG-1 remain suspicious as the rescue seemed to easy and Carter pats down Rya'c and finds nothing. While O'Neill still remains suspicious of a trap, Teal'c is adamant that there is not one and all but Bra'tac head for the Stargate with Bra'tac going to get Drey'auc. Near the Stargate, the team finds only two Jaffa guarding it, increasing O'Neill's suspicions. Rya'c claims his earlier calling for the guards was because he hadn't broken free yet while Bra'tac admits that since they took out most of what few Jaffa Apophis had left, he may have been able to spare no one else to guard the Stargate. With no other choice, O'Neill agrees to take Rya'c back to Earth despite his suspicions. SG-1 kills one Jaffa with zat fire and stun the other one who Teal'c kills with his staff weapon. SG-1, Drey'auc and Rya'c travel to Earth though Bra'tac chooses to remain behind.

While Dr. Janet Frasier examines Rya'c, Drey'auc notices that two teeth Rya'c had previously lost are once more there. When Frasier tries to sedate him, to investigate, Rya'c goes wild, revealing he is still brainwashed though they succeed in sedating him. When Rya'c comes to and can't get out of the room he is locked in, he tries to chomp his teeth only to find the two fake ones missing. Frasier explains what was apparently Apophis' plan: after capturing Rya'c, he filled each of the two fake teeth with a separate inert biological organism that was like a virus. When the teeth were broken, the organisms would've combined and released the most deadly biological weapon Frasier had ever seen into Earth's atmosphere which he had wanted to get outside and do from the start. Within two days it would have spread across North America and then the whole world in a week. A day after the world was infected, the virus would've wiped out all life on Earth. In order to restore Rya'c's mind, Teal'c tries to remind him of his love for his family, but it fails. O'Neill suggests electroconvulsive therapy which Frasier admits could work, but might kill Rya'c's symbiote, effectively dooming him to death. In response, Teal'c suggests using a zat blast instead which has similar effects to ECT and won't harm a Jaffa of any age beyond serious pain. With no other choice, Teal'c shoots Rya'c with a zat, causing him great pain but breaking the brainwashing of which Rya'c has no memory of. Afterwards, Drey'auc and Rya'c are sent to the Land of Light to start new lives.

Heru'ur's attack on Abydos
Dr. Daniel Jackson and Teal'c return to Abydos one year after the kidnaping of Sha're and Skaara to find Sha're there and pregnant with Apophis' child. They decide to take her to Earth, but as they dial the Stargate, a Cheops-class warship lands on the Temple of Ra and they are forced to flee. Heru'ur and four Jaffa, including Ryn'tak arrive via the transportation rings and set out to look for the child so Heru'ur can take him as his own. While Jackson delivers the baby, Ryn'tak interrogates Kasuf, but is caught and killed with a Zat'nik'tel by Teal'c. Teal'c dresses in Ryn'tak's Horus Guard armor and zats the returned Amaunet after telling her to tell Apophis that Heru'ur has taken the child.

Teal'c takes Jackson to the pyramid where he offers an alliance with Heru'ur against their common enemy Apophis who he and Teal'c claim returned and took the child. Heru'ur is not convinced, planning to conquer Earth himself when he's done with Apophis, but as he goes to torture Jackson with his kara kesh, the Stargate starts to activate and Heru'ur's Jaffa and Teal'c take up positions alongside it, believing it to be Apophis returning. As the Stargate activates, Teal'c shoves one Jaffa into the unstable vortex, disintegrating him and zats the other two, though he is mildly wounded by a staff weapon blast. Colonel Jack O'Neill and Captain Samantha Carter come through the Stargate instead and Carter finishes off the stunned Jaffa with her zat, disintegrating them. Heru'ur tries to blast O'Neill and Carter as they dive for safety, but Jackson shoves his kara kesh away so they have time. O'Neill fires at Heru'ur, but he puts up his personal shield which deflects the bullets so O'Neill throws a combat knife through the shield, kara kesh and Heru'ur's hand, damaging the kara kesh and shield which flickers in and out of existence. Angry, Heru'ur has no choice but to retreat to his ship through the rings. Soon after, Apophis arrives for Amaunet and the child. Amaunet tells him Heru'ur took the child, but looks right at SG-1 and doesn't tell Apophis they are there, indicating Sha're still has some control or at least influence over Amaunet. SG-1 return to Earth and Heru'ur leaves Abydos empty-handed.

Skirmish on P34-353J
Captain Samantha Carter receives a vision from the memories of the Tok'ra symbiote Jolinar of Malkshur that she was briefly host to that points to P34-353J as a Tok'ra base. SG-1 travels there to make an alliance with the Tok'ra and while they are trying to convince the Tok'ra to trust them, the Goa'uld System Lords send two Ha'taks to destroy the base and the Tok'ra and the Tok'ra begin evacuating while Jacob Carter starts blending with Selmak. As the Tok'ra evacuate the base, Colonel Jack O'Neill remembers seeing the Tok'ra Cordesh with a Goa'uld long range visual communication device and alerts Garshaw, believing him to be a spy. After learning of the communications device, Garshaw investigates as the Tok'ra don't use those. They find Cordesh's host Firnan in a collapsing tunnel saying that he couldn't stop him and that he's not who he appears to be. The tunnel then collapses, killing Firnan and they believe Cordesh. However, O'Neill realizes that the symbiote, who is actually a Goa'uld named Anker and not Cordesh, jumped hosts to Liandra after he sees her with the communications device. Anker is removed from his host and left to die in the collapsing tunnels.

Eventually all that's left in the tunnels are SG-1, Garshaw and Martouf and Carter chooses to remain behind with Martouf and her father until his blending is complete while everyone else evacuates to Earth. Reaching the Stargate, O'Neill, Teal'c, Dr. Daniel Jackson and Garshaw come under attack from newly-arrived Death Gliders, but manage to get through the Stargate to Earth unharmed. The Death Gliders bombard the surface as Selmak finishes blending with Jacob and the three head to the Stargate. As they arrive at the Stargate, the Goa'uld start dialing in so Carter tries to dial out faster. Though they aren't sure who managed to open a wormhole first, as the Death Gliders are closing in on them, they have no choice and flee through the Stargate as the Gliders fire. Luckily, Carter had succeeded in opening the wormhole and they safely reach Earth where the Tok'ra travel to their new base to evacuate it for a different planet for fear that Anker revealed their new base's location as well.

Sokar's attack on Earth
After receiving coordinates from what is believed to be the Tok'ra, SG-1 travels to PB5-926 where a Death Glider is chased by two other Gliders and crashes. The pilot turns out to be Apophis who begs for the team's help. Chased by the Gliders, the team takes Apophis through the Stargate to Earth where he demands sanctuary. It's discovered that Apophis is not only severely injured, but the symbiote has been tortured as well and both the host and symbiote are dying as a result. Also, without a Sarcophagus to sustain him, Apophis begins to age as his body is over ten thousand years old. Apophis reveals that Sokar is the one who tortured him and offers all of his knowledge in exchange for a new host in order to survive. The Tok'ra try to get Earth to send Apophis back to where they found him, but they refuse.

Angered over losing Apophis, Sokar starts to dial in and use a Particle accelerator to heat up the Iris with the intention to melt it so he can invade Earth. The wormhole is only able to be held open for thirty-eight minutes and during that time, Stargate Command personnel use liquid nitrogen to try to cool down the iris to little use. When that time is up, the SGC tries to dial out, but Sokar dials in first and continues his attack. Knowing that even if he fails to penetrate the iris, he will likely send ships to attack, it is decided to dial back to PB5-926 when the wormhole shuts down and send Apophis back through, stopping medical intervention at the same time so that Apophis will die. As Sokar is at war with Heru'ur, this will be enough to stop the attack.

As the attack continues, Apophis' weakened condition allows his host to surface and Dr. Daniel Jackson comforts him. Apophis regains control and begs for a new host, admitting that he's afraid before dying, but the host remains alive for a little longer. Jackson promises to do the funerary rites of his culture so he can move on and the host dies too. Thanks to Captain Samantha Carter speeding up the dialing process, the SGC is able to dial out before Sokar can dial back in and Apophis' body is sent through the Stargate back to PB5-926. This is enough to make Sokar stop his attack as even though Apophis is dead, he has a sarcophagus and can revive him.

Hathor's capture of SG-1
On a mission to an unnamed planet, SG-1 except Teal'c, who she leaves badly wounded, are captured by the rogue Goa'uld System Lord Hathor and taken to her base where she has them placed in Stasis pods. Three weeks later, she releases them and has her First Prime Trofsky and Raully, who is really a Tok'ra operative, pretend its seventy years in the future using a mock-up of Stargate Command inside her base. Trofsky and Raually use the Memory recall device to question SG-1 on the state of the Goa'uld Empire. At the same time, Teal'c recovers from his injuries and travels to Chulak to gather reinforcements to try to rescue his team. There he finds a badly injured Bra'tac and starts the beginning of the Jaffa Rebellion. Colonel Jack O'Neill grows suspicious of what is going on and escapes, searching Hathor's base and rescuing Captain Samantha Carter and Dr. Daniel Jackson before searching for a way out. They are recaptured by Hathor who plans to implant O'Neill with a Goa'uld symbiote, but is stopped by Raully when he tries to kill it under the pretense of stopping his attempt to kill it.

Meanwhile, SG-3 encounters the Tok'ra who give them the location of Hathor's base and Major General George S. Hammond organizes a rescue mission made up of SG-3, 5, 6 and 11. At Hathor's base, she straps O'Neill into a cryogenic tank and implants him with the Goa'uld, but Raully secretly puts him into stasis, which prevents the blending and kills the Goa'uld before Hathor discovers her and severely injures her with a Kara kesh. Carter and Jackson are rescued by the rescue team, but SG-3, who are guarding the Stargate, are captured and the rescue team is cut off from the Stargate by a giant shield and Sentry gun posts. The attack kills a few members of the rescue team, but blasts a hole into Tok'ra tunnels which the survivors escape into. Hammond, getting worried about the team, dials the planet and makes radio contact with them and after learning their situation, promises to send reinforcements in six hours while the team plans to take out the shield. Carter heads off armed with explosives to try to locate the generator while Jackson and the rest of the team are captured by Hathor's Jaffa. Carter finds Raully who tells her how to release O'Neill, which she does, but she is found by Hathor who starts to kill her with a hand device before O'Neill recovers and throws Hathor into the super-cool cryogenic fluid, killing her. The two find out from Raully that the shield generator is hidden behind the fake Stargate in the SGC mock-up and head there to plant explosives on it.

At the same time, Hammond is unable to get authorization to send more men to rescue those already captured and travels to Chulak himself to get help from Teal'c and Bra'tac. The three uncover a Needle Threader hidden by Bra'tac to give them an advantage over Hathor's forces and prepare their attack. Near the Stargate, Trofsky uses his captives to try to draw Carter out and O'Neill decides to pretend to be possessed by the Goa'uld to trick him. Trofsky quickly sees through it and refuses to give up even when learning of Hathor's death. As soon as the Stargate starts dialing, Carter blows the C-4, taking down the shield and O'Neill shoots Trofsky. The Needle Threader comes through first, piloted by Teal'c and Hammond and destroys one of the Sentry gun posts. Bra'tac and several rebel Jaffa arrives and Bra'tac kills Trofsky, who survived O'Neill's attack thanks to his armor, with a staff weapon blast. After Hammond destroys the other attack tower with the Needle Threader's cannons, Bra'tac gets Hathor's few remaining Jaffa to surrender, ending the fight.

Setesh's infiltration of Earth
After Earth rebelled against the Goa'uld and buried the Stargate, the Goa'uld Setesh was left trapped on Earth with no way off of the planet. Over the next several thousand years, Seth survived by using a sarcophagus or changing his hosts every four hundred years or so and started a cult in his name throughout various parts of history, controlling the members with the drug Nish'ta and forcing them all to commit suicide or murdering them when the authorities got too close, hiding also from the System Lords and the Tok'ra, both of whom wanted him dead. In 1999, the Tok'ra mapped out where all of the known Goa'ulds were and realized since they had no record of Seth after the burial of the Earth Stargate, that he was likely hiding out on Earth. Selmak, wanting to push his host Jacob Carter to fix his relationship with his son Mark Carter, volunteers for the mission and the two enlist the help of SG-1. Dr. Daniel Jackson searches Earth history for false religions in the name of Seth, figuring that he would create one to have power and followers and found his cults throughout history. After running a search on the United States Government classified net to see if the CIA had anything on Seth, he located Seth's current cult just north of Seattle, Washington on the ATF page as the ATF were investigating him because of his massive compound and all of his weapons. His current cult had about fifty members and deprogrammed members described him having Goa'uld abilities including the signature glowing eyes.

SG-1 and Jacob investigate the compound, getting close thanks to the help of Jason Levinson who's son Tommy Levinson is a member of the cult. There they find out that among other powerful weapons, the followers carry Zat'nik'tels, confirming their suspicions of there being a Goa'uld there. However, the group is captured by ATF agents led by Special Agent James Hamner. Hamner reveals that he plans to try to force Seth to surrender and is annoyed when the team refuses to cooperate and tell him anything, although he does allow them to call Major General George S. Hammond. Hammond gets the President of the United States involved and the President personally calls Hamner and puts Colonel Jack O'Neill in charge of the operation. Going by Seth and other Goa'ulds mode of operation, the group realizes that there must be an emergency escape tunnel and with the help of the ATF forces, locate the entrance. Having figured out that Seth must be using Nish'ta to control his followers and knowing that an electric shock will break the Nish'ta's hold, Captain Samantha Carter sets herself, Jackson and O'Neill up with earpieces that can deliver and electric shock while leaving Jacob and Teal'c behind as Seth will be able to sense their symbiotes.

The three enter the tunnels and are brought into the compound by Transportation rings where Seth gives them Nish'ta. After they wake up, he detects that Carter used to be blended to a Tok'ra and starts questioning them, forcing Jacob and Teal'c to shock them before they're sure its been enough time. Hamner, believing them to be compromised, surrounds the compound with his men while Seth orders SG-1 killed. The three manage to overpower the disciple ordered to kill them and shoot him with his own Zat, freeing him from the Nish'ta. He reveals that he is Tommy Levinson and helps the three find more Zats which SG-1 is able to use to free Seth's followers who are preparing to blow themselves and the compound up. Tommy is able to transport Carter and the disciples down to the escape tunnels where they make their way out to be met by Hamner and his men, but Seth and his remaining followers corner Jackson and O'Neill. The two Zat the followers, but Seth's Kara kesh protects him with an energy shield and he knocks the two out before setting a bomb near them and escaping wearing one of his follower's cloaks. The two recover in time to escape while Jacob, armed with a Kara kesh of his own, enters the tunnels to confront Seth. Selmak finds Seth, but is injured by him before he can kill him. Selmak, who is able to heal his injuries but needs time, gives Carter his hand device, telling her she needs to use it to stop Seth. Carter confronts Seth, and despite having never used it before, manages to blast Seth down before he can blast her. Carter then blasts Seth with it again, crushing his midsection into the ground hard enough to create a small crater and killing him.

Protected Planets Treaty Summit
After learning of a planned attack on Earth by the Goa'uld System Lords, the Asgard Thor comes to Earth in his ship and informs Colonel Jack O'Neill about the threat and offers Asgard help. As the Asgard fleet is engaged elsewhere, Thor offers to protect Earth by negotiating with the System Lords to include it in the Asgard's Protected Planets Treaty. Though O'Neill prefers the Asgard using their ships to defend the Earth, as that isn't an option, he agrees. Soon afterwards, Thor notifies SG-1 and Major General George S. Hammond that the System Lords have agreed to negotiate and are sending three representatives by Stargate in four days for the summit. Along with information on the three Goa'uld, Cronus, Yu and Nirrti, Thor sends orders that all weapons be removed from the base as no weapons are allowed during the summit from either side. Reluctantly, especially in Teal'c's case, they comply with this order and remove all weapons from the base and seal it off. Secretary of Defense Arthur Simms remains on the base to represent the President of the United States while the Asgard choose a reluctant O'Neill to act as Earth's representative as he led humanity into the stars through the Stargate despite his preference that Dr. Daniel Jackson, who is assigned to act as the Goa'uld liaison, be the representative.

Four days after Earth is notified, the Goa'uld arrive and are assigned VIP quarters which they are unhappy with. After being shown to their rooms, tensions rise when Teal'c and Cronus see each other and when Nirrti and Yu discover surveillance cameras in their rooms which they demand removed. Jackson is able to calm the situation and comes up with the compromise that the cameras will be removed from the rooms but remain in the halls which the Goa'uld agree to. Cronus also demands Teal'c stay away from him and Teal'c explains to Jackson that he hates Cronus deeply as Cronus murdered his father after he lost an unwinnable battle as Cronus' First Prime and has since sworn to get revenge. Soon after, as they wait for the negotiations to commence, Major Samantha Carter admits that she's realized that Cronus is the one that sent the Ashrak Edrekh tho kill Jolinar of Malkshur, the Tok'ra she was briefly host to and the attack she nearly died as a result of. The negotiations get off to a bad start as after Thor opens them, the System Lords start to insult each other in the Goa'uld language and O'Neill unintentionally insults them by speaking out of turn to ask if they could all speak the same language, causing the Goa'uld to storm out. Thor explains to O'Neill what happened and why the Asgard allowed the Goa'uld to get so powerful: they have a much worse enemy in their home galaxy and cannot spare the resources to fight the Goa'uld too. The Asgard rely on the System Lords to enforce the treaty out of fear of Asgard retaliation with the System Lords keeping even rogue Goa'uld like Sokar from breaking it. However, as the Asgard rely on this and Goa'uld's feudal nature, if a single Goa'uld rose to dominate power such as Sokar, the Asgard wouldn't have the power to stop them from attacking and enforce the treaty as they are pretty much bluffing the Goa'uld into thinking they have the power to stop them. Thor then gives O'Neill a way to contact him when the Goa'uld are ready to return to negotiations and leaves but not before warning O'Neill and Jackson that the negotiations won't be easy and both the Tau'ri and the Asgard will be required to make great sacrifices to succeed.

After Jackson types up an apology letter in Goa'uld and O'Neill signs it, the System Lords agree to continue and the negotiations resume. Thor agrees to open the Passage of Nilor to the Goa'uld in return for Earth's inclusion into the treaty, but the Goa'uld are reluctant as the treaty states that no human civilization protected by the treaty can rise to become a threat to the Goa'uld. They agree however, but demand the forfeiture of both of Earth's Stargates in order to limit Earth's development and eliminate the threat that humanity poses to them. The negotiations recess as the Tau'ri try to decide what to do as if they don't give up the Stargates the Goa'uld will destroy Earth, but if they do, there are other threats that the treaty doesn't protect them from and giving up Stargate travel would leave them vulnerable if the Goa'uld ever called the Asgard bluff and attacked anyway and they had no new advanced technology to defend themselves with. After O'Neill is unable to get an opinion from Thor about what they should choose, the President decides to agree to the Goa'uld terms, but before they can inform the System Lords, Cronus and Teal'c are found unconscious in Cronus' room. While Teal'c took a bad blow to the head, his symbiote will be able to repair the damage over time, but Cronus took severe internal injuries to the point where neither Dr. Janet Frasier nor his symbiote can save him. The security camera tape of the incident shows Teal'c going to Cronus' room, but as there are no cameras inside Cronus' room, it looks like Teal'c attacked him in revenge for his father's death and they can't prove otherwise though SG-1 and Hammond believe him to be innocent. SG-1 inform Nirrti and Yu of Cronus' attack but not of Teal'c's apparent involvement and have Nirrti use a Goa'uld healing device to try to save Cronus. It doesn't work and Nirrti tells them that Cronus' injuries are too severe and he needs a sarcophagus to survive. As Earth doesn't have one, the Goa'uld prepare to leave to save Cronus and prepare their attack on Earth in revenge.

As the summit is apparently over, Thor is ordered to leave Earth and informs O'Neill of this fact, telling him that to stay and fight would put the Asgard into a greater war that they couldn't win at the moment. He also warns O'Neill not to imprison the Goa'uld as the other System Lords would attack anyway even if they didn't return to order the attack. Despite this, the Tau'ri imprison the Goa'uld and bring in soldiers armed with guns despite the rule that states no weapons are allowed. As they wonder how to prepare for the impending devastating attack, they receive word that Teal'c has regained consciousness. Teal'c explains his side of the story: he received a message from Cronus to meet him alone, but when he did, Cronus denied sending the message and they were attacked by an invisible force. When everyone assumes it might be a Reetou, Teal'c informs them that he didn't sense one and that he knows of no Goa'uld with invisibility technology besides Hathor who is now dead. Carter decides to try to use the healing device on Cronus herself and manages to heal his injuries, saving his life. In return for SG-1 exposing which Goa'uld attacked him, Cronus agrees to support the treaty without Earth having to give up the Stargate.

Realizing Nirrti lied about not being able to heal Cronus, O'Neill suggests bluffing that they know more than they do and confront Nirrti and get her to confess. O'Neill confronts Nirrti about failing to heal Cronus and claims that they talked to the Tok'ra who told them that Nirrti was experimenting with phase shifting technology to fight the Reetou. Nirrti denies it, but an enraged Yu attacks her, saying that she always coveted Cronus' territory and that she was the one that always opposed the treaty. When Yu strangles her, Nirrti turns invisible, grabs a guard's gun and fires at Yu who O'Neill shoves to safety. Nirrti tries to escape but when Carter corners her with a Transphase Eradication Rod which makes her visible and threatens to shoot, Nirrti surrenders. In the aftermath, Yu agrees to the treaty without Earth having to give up the Stargate and the attack on Earth is averted. The System Lords leave with Nirrti as Cronus' prisoner, but before he leaves he warns that while Earth will not be attacked, any Tau'ri found by the System Lords off-world will be shown no mercy. The treaty ends up protecting Earth for years from Goa'uld attacks until Anubis rises to power at which time Earth eventually comes under attack from him, but the Tau'ri find a way to stop it on their own.

Saving Alternate Earth
An alternate reality Dr. Samantha Carter and Major Charles Kawalsky flee their reality to ours using the Quantum Mirror. There they ask for sanctuary from their world as it has been overrun by the Goa'uld System Lord Apophis. While they are originally allowed to stay, Dr. Carter begins to experience entropic cascade failure due to the presence of two Samantha Carters in one reality and in order to prevent her death, SG-1 must free her world from the Goa'uld. They decide to contact the Asgard of her world for help and the two Carters are able to make the power booster device Colonel Jack O'Neill made while the Repository of Knowledge was in his brain work again so they can dial the Asgard galaxy.

After Dr. Daniel Jackson finds the right reality in the mirror, Dr. Carter, Kawalsky, O'Neill, Teal'c and Jackson travel there while Major Samantha Carter from the correct reality remains behind. Once they arrive, they are forced to deactivate the mirror to prevent detection. Following the Jaffa, they find Apophis himself arriving through the Stargate and catch the alternate Teal'c's attention and lead him back to the storage closet where the mirror is. While Teal'c tries to get the alternate Teal'c to join them, he believes in the Goa'uld and Teal'c is forced to kill his alternate self. Teal'c then takes on alternate Teal'c's role as Apophis' First Prime and leads Dr. Carter to the Stargate Operations room where Apophis is torturing Major General George S. Hammond for the Stargate address to the Beta Site. Teal'c pretends to take over the interrogation as Apophis leaves and sends the other Jaffa with him. As they start to set up to dial the Asgard homeworld, a Goa'uld Ha'tak lands on top of Cheyenne Mountain. Teal'c and Dr. Carter are able to successfully set up the new dialing program created by O'Neill while he had the knowledge of the Ancients and O'Neill sets up the generator in the power room, causing the Stargate to dial the Asgard homeworld. As Hammond pretends to be a prisoner, Teal'c distracts a Jaffa that goes after Dr. Carter, allowing her to escape through the Stargate.

However, as a result, Apophis becomes aware of Teal'c's betrayal and captures Teal'c and Hammond. Returning to the storage closet, O'Neill and Kawalsky find Jackson captured and are forced to surrender to spare his life. They are taken before Apophis who threatens Hammond's life to force them to tell him how O'Neill is alive, having been killed in that reality and who Teal'c is. When Apophis doesn't believe them, he has Hammond killed. However before Jackson can be shot more than once with a Zat'nik'tel, an Asgard mothership arrives and Apophis orders his troops to flee through the Stargate. As he goes to kill the prisoners, the mothership beams him and two Jaffa with him away and the Ha'tak retreats. Apophis' remaining Jaffa retreat through the Stargate and the invasion ends. The Asgard also beam away the alternate Hammond briefly and return him resurrected along with Dr. Carter. In the aftermath, with the alternate Earth saved, O'Neill, Jackson and Teal'c return home where their Major General George S. Hammond has the mirror destroyed.

Skirmish on Medieval planet
SG-1 travel to a Medieval planet where they find an ill young woman named Mary chained up. Believing they are demons come to take her, a young man named Simon begs them not to take her and to take him instead. As they treat Mary for what they believe is chickenpox, what the villagers believe to be a demon shows up and is revealed to be a Goa'ulded Unas in service to Sokar who demands five sacrifices for Sokar to use as hosts. SG-1 decides to kill the Unas and then have the villagers bury their Stargate, believing that as the planet is seemingly years away from any known Goa'uld homeworld by ship, they won't bother to come back that way for revenge. When the Canon returns, he uses his ring to knock out SG-1 believing them to be evil. Teal'c is subjected to The Tests and when he fails, he is drowned. As a result of Teal'c's passing the test, the Canon decides to let SG-1 go and they convince Mary and Simon to come with them. However, Teal'c comes back to life having been sustained by his symbiote and the Canon declares the team evil and makes them and Mary the next sacrifices.

When the Unas returns, SG-1 and Mary are taken but briefly escape. The Unas catches them again, but Simon arrives with their gear and Teal'c's staff weapon. Simon shoots the Unas three times with the staff weapon but fails to kill it and is forced to run. SG-1 are able to use the staff to free themselves from the chain. While the others head to the Stargate, Colonel Jack O'Neill and Teal'c go after Simon who is knocked out after running into the Canon who the Unas goes after next. When O'Neill and Teal'c arrive, they find the Unas dead, the Canon unharmed and Simon knocked out. The Canon claims that the Unas died before it could harm him and Teal'c realizes that the Unas' wounds were too severe for even its Goa'uld to heal. O'Neill, Teal'c, Simon and the Canon meet up with the others at the Stargate where Major Samantha Carter starts to dial Earth but due to being a host to Jolinar of Malkshur is able to sense that the Unas' Goa'uld went into the Canon when its old host was dying. The possessed Canon attacks and O'Neill is forced to shoot him. The Goa'uld dies and the Canon lives long enough to beg forgiveness. Afterwards SG-1 return to Earth and Simon and Mary agree to bury the Stargate.

Skirmish with SG-X
Arriving at Apophis' training planet searching for a downed UAV, SG-1 finds an unidentified SG team pinned by Jaffa and wonder if it could be the missing SG-11 who disappeared months before on P89-534. Unable to raise the team on the radio, SG-1 decides to lay down covering fire and help them escape, but instead of being grateful, the captain in charge demands to know who they are and then has them stunned when SG-1 just tells them to run. Waking up, SG-1 is approached by a soldier named Lt. J. Hibbard who confuses them with claims that they are dead and are not supposed to be talking and then leads them to the leader of the soldiers, Captain Kyle Rogers. SG-1 is further confused as Hibbard's patch says SG-X which doesn't actually exist. To Colonel Jack O'Neill's confusion, Rogers doesn't show him the respect a captain should a colonel and mentions the Rules of Engagement which neither O'Neill or Major Samantha Carter are familiar with. Teal'c recognizes it however and when he addresses Rogers in Goa'uld, Rogers starts listening to him, believing Teal'c and SG-1's presence to be a challenge and refers to the Stargate as the Chapa'ai, the Goa'uld name for it, showing he isn't from Earth. Rogers explains that he and his men's orders are to practice exercises of battle under the Rules of Engagement until Apophis, who they worship as a god, returns to have them infiltrate Earth. The Jaffa they were fighting were really more Humans who were practicing for their infiltration led by Captain Nelson, Rogers' second-in-command who Teal'c orders to be fetched while Rogers leads SG-1 to the armory tent to get their weapons. Along the way, they notice that none of the young men training in the camp are Jaffa and Teal'c explains that Apophis was using Humans as after his failed attack on Earth, he had very few Jaffa left loyal to him.

At the armory, SG-1 finds their GDOs, but not Carter's H&K MP5A3 submachine gun or Teal'c's staff weapon. Teal'c explains that the other weapons they do find are intars, stun weapons meant for training that can take on any form including MP5s, pistols and staff weapons. While Carter and Dr. Daniel Jackson search the tent to try to find the missing weapons, O'Neill asks Teal'c to gather everyone to make sure they don't have SG-1's weapons with which they can actually get hurt. Teal'c has Rogers assemble the warriors with a vo'cume that projects a message from Apophis, but find that none of the assembled warriors possess the missing weapons but most of the warriors are engaging in the day's war games. O'Neill tries to convince the assembled warriors that the infiltration of Earth has been cancelled by Apophis, but none believe him. At the same time, Carter and Jackson only find one pistol and MP5 which means that the rest of SG-1's weapons are actually being used during the games. O'Neill and Teal'c fail to get Rogers and Nelson to call in the rest of the warriors or get them to believe that Apophis is dead and they go back to fighting. After finding out that one MP5, Teal'c's staff weapon and two pistols are missing, O'Neill stuns Hibbard with an intar and has SG-1 join the war games to try to stop any bloodshed with the real weapons. They arrive too late to stop one of the warriors from being killed with Teal'c's staff weapon and Rogers is hit and wounded before O'Neill can take out the "Jaffa" that has the weapon. Rogers' injury brings an end to the games, but as blood has been shed, it causes the young warriors to believe that the day of the Final Challenge has come where the war games become real. Rogers orders the Final Challenge to begin at dawn. SG-1's weapons are returned to the armory tent when the games end and they decide to take Rogers back to Earth with them to treat his wound. Rogers initially refuses as the rules say he no one can leave before the Final Challenge, but Jackson convinces him by telling him they'll take him to see Apophis himself.

On Earth, Rogers realizes he's been tricked and is taken for treatment while Teal'c explains in debriefing with Major General George S. Hammond that the Final Challenge is when a warrior receives his first real weapon and the two opposing camps in the war games then engage in battle until one side is victorious and the other is dead. Even though they don't think the warriors have real weapons, SG-1 recognizes that they are determined to continue on as their Jaffa masters had long ago abandoned them and they still continued their games. Needing more information on what's happening, O'Neill decides to talk to Rogers, who wasn't seriously injured, about everything. Rogers refuses to listen until O'Neill shows him a video of Apophis' death and then Rogers finally believes him but says he can't go home as many of his men will die because of the now-useless Final Challenge. Rogers then meets with SG-1 and Hammond and explains what's going on: shortly after SG-1 blew up Apophis' Ha'taks over Earth, he took all of the young men involved in the war games from a number of worlds and set Jaffa to train them. Apophis captured SG-11 and his Jaffa forced them to teach the warriors about Earth though they didn't reveal all he wanted to know and were eventually killed and put on display. As Apophis' power weakened more and more, the Jaffa masters all left one by one until the warriors were alone to continue their war games. Having revealed all that he knows, Rogers asks for SG-1's aid in stopping the Final Challenge, revealing that Master Gar'toc, the last Jaffa master to leave showed him and Nelson a cave full of real weapons that will be used in the Challenge. Carter comes up with the idea to upload the recording of Apophis' death to the vo'cume and show it to the warriors to get them to understand that Apophis is dead and to stop fighting. As they took some of the intars from the camp, SG-1 can shoot anyone who tries to stop them and Hammond agrees. Rogers explains the Final Challenge scenario which is his SG squad will defend the camp from other attacking SG teams led by Nelson as it would be like when they fight real SG teams when attacking Earth. In the scenario, the attackers have better numbers but the defenders have greater firepower. The plan is for SG-1 to take the camp and then while Carter sets up the vo'cume, Teal'c, O'Neill and Jackson will take over as the defenders of the camp to buy her time.

On the way to the camp, SG-1 and Rogers encounters two warriors who Carter and O'Neill stun them after Rogers uses himself to draw fire against orders to stay with Carter and do nothing. Upon arriving at the camp, Rogers distracts one of his men manning a M2 Browning, allowing SG-1 to sneak in and stun the other defenders. Rogers then stuns the man he distracted and leads SG-1 to the vo'cume. O'Neill, Jackson and Rogers defend against enemy warriors while Carter, guarded by Teal'c, works to upload the video of Apophis' death to the vo'cume. As Carter needs time to set the vo'cume up properly, Teal'c joins the others as they come under M224 mortar attack which luckily misses. To O'Neill's anger, Rogers reveals that the enemy warriors have a bunch of other powerful Earth weapons at their disposal including FIM-92 Stinger missiles, M60 machine guns and M72 LAWs. After a few more mortar attacks, Carter manages to upload the video to the vo'cume and activates it in the middle of the camp. Seeing the image from Apophis' usual message causes the warriors to stop fighting though Nelson insists on continuing the battle to the death. However, before the Challenge can restart, the image on the vo'cume changes to the video of Apophis' death, stunning the warriors. Seeing that SG-1 were telling the truth about Apophis being dead causes the warriors to lose the will to fight and decide to go home instead.

Skirmish on P8X-873
Amaunet had traveled to the planet Abydos and kidnapped a group of Abydonians, including Kasuf, Sha're's father and brought them to P8X-873. She did this to steal the Harcesis and hide him from her enemies, kidnapping the Abydonians to trick Heru'ur, who she had allied herself with into believing she had different intentions. Stargate Command sends SG-1 and several another SG team to the planet to rescue the Abydonians from captivity. During the attack, Colonel Jack O'Neill, Major Samantha Carter and the other SG teams held off the Jaffa who attacked with a staff cannon and waves of Jaffa. Carter took out the cannon with an AT4 while the teams took down the charging Jaffa with both their personal weapons and a mounted M2 Browning that O'Neill took control of himself when the soldier manning it was killed.

At the same time, Dr. Daniel Jackson ran to the tent where he killed one Jaffa and Teal'c killed another and once he got inside, tried to save Sha're from Amaunet's control but failed and got stuck in Amaunet's Kara kesh to his head. Teal'c found him and was forced to kill her with his Staff weapon. Amaunet died first, allowing Sha're to briefly regain control and say goodbye to Jackson. During Amaunet's torture of Jackson, Sha're managed to communicate a message to him telling him that Amaunet had taken the Harcesis child to Kheb, starting a search for him. All of Amunet's Jaffa were killed in the battle and Sha're's body was taken back to Abydos to be buried while most of the Abydonians were successfully rescued.

Skirmish on Netu
Knowing that Sokar was gaining massive power, the Tok'ra sent Jacob Carter/Selmak to infiltrate his ranks and learn the size of his forces and his plans. Though Jacob was successful, learning that Sokar's forces were ten times what they believed them to be and that he was planning an attack on the System Lords that he'd win, Jacob is captured and imprisoned on Sokar's hellish prison moon Netu which was ruled by the Goa'uld Bynarr and his First Prime Na'onak. Knowing that Jacob's information at the very least needed to be retrieved, the Tok'ra sent Martouf to enlist the help of SG-1, especially Major Samantha Carter, the last host to Jolinar of Malkshur, the only person to ever escape Netu. The group used a Tel'tak to travel to Netu where all of SG-1 (except Teal'c) and Martouf travel to Netu's surface in escape pods. There, the group is captured once Carter identifies herself as a former host to Jolinar and are reunited with Jacob who passes on his information to Teal'c through a Short range communicator.

Carter is taken to see Bynarr and finally remembers how Jolinar escaped: she seduced Bynarr (who Carter deduces truly loved her) and then stole his key to the secret Transportation rings in his quarters which she used to escape to the planet Delmak (which Netu orbited) and stole a Tel'tak there. Bynarr goes to kill her to get some revenge on Jolinar, but is killed from behind by Na'onak with a staff weapon. Using the distraction of the uprising coming from Bynarr's death, the team tries to escape through the rings to Teal'c's ship, but were captured by Na'onak who revealed himself to really be the resurrected Apophis. At the same time, Teal'c was forced to flee the system after being cornered by two Death Gliders and hearing a message from Apophis and returns to Vorash to alert the Tok'ra and get some help for a rescue. The Tok'ra, disturbed by the information of Sokar's forces, come up with a plan to kill him: they know he'll take his Ha'tak into Netu's orbit to put down the uprising before attacking the System Lords so they plan to launch a weapon into Netu's core that will destroy the moon and Sokar's ship, killing him.

Meanwhile, Apophis tortures the team for information, but only gets a false location for the Tok'ra from Martouf before Sokar arrives and Apophis convinces him to make him Lord of Netu while really planning to assassinate him and take his place. Teal'c and the Tok'ra Aldwin arrive and Aldwin launches the weapon against Teal'c's wishes, starting Netu's destabilization which will take twelve minutes. The team manages to use the explosions to escape from their cage and make their way to the rings while Apophis boards Sokar's ship and tries to assassinate him, but fails as Sokar conquered the planet the Tok'ra supposedly are on. Netu's impending destruction allows Apophis to break free and shoot Sokar, but Sokar's personal shield protects him and Apophis flees. SG-1, Jacob and Martouf manage to make it to the rings which Martouf successfully hotwires and they ring aboard the Tel'tak once Teal'c gets into position. Netu explodes, destroying Sokar's Ha'tak and killing Sokar, but Apophis manages to use the ship's rings to escape to Delmak where he takes over control of Sokar's vast forces, restoring Apophis to a position of power once again.

Zipacna's attack on Tollana
Using the Triad of Klorel as a pretense, the Goa'uld Underlord Zipacna has his Jaffa paint the Tollans Ion cannons as targets for a Ha'tak he claims is there to pick him and Klorel up once the Triad is over. After the Triad doesn't go in the Goa'uld's favor with Klorel being ordered to be removed from Skaara by the Tok'ra, Zipacna uses a Goa'uld Long range visual communication device to signal the Ha'tak to attack before escaping through the Stargate himself. The Ha'tak destroys all of the Ion cannons and it and Death Gliders attack the defenseless Tollan, but Teal'c had been suspicions of Zipacna and had Lya of the Nox hide one of the Ion cannons. Using the hidden cannon, Teal'c destroys the Death Gliders and Ha'tak, ending the attack. Soon afterwards, Klorel is extracted from Skaara who is finally set free.

Apophis' attack on Kheb
In his search for the Harcesis child Shifu, which Sha're hid on the legendary planet Kheb, Apophis sent a team of eight Jaffa to retrieve him and the priestess carrying him but they are killed by the Ascended Ancient Oma Desala. After they didn't return, Apophis sends a Ha'tak to the planet to continue the search. At the same time, after Apophis announces his return and powerful new forces with an attack on Chulak looking for the Harcesis, SG-1, SG-2 and Bra'tac manage to figure out the Stargate address to the planet and head there to find the child for themselves with SG-2 remaining behind to protect the Stargate. While Dr. Daniel Jackson is learning about Ascension from the Kheb Monk, Teal'c and Bra'tac discover the Ha'tak landed nearby with many troops massing after witnessing two Death Gliders fly overhead. They quickly return to the temple and inform the rest of SG-1 that around 2,000 Jaffa are on their way to the temple to get the Harcesis child.

However, as Jackson doesn't want to leave, believing that the monk is teaching him how to harness powers such as telekinesis and pyrokinesis which will allow him to protect the child, the rest of the team and Bra'tac take up defending positions and set up A-M18A1 Claymore mines to take out the Jaffa as they get close. When the Jaffa arrive, reluctant to get into a fight, SG-1, Bra'tac and the Jaffa enter a standoff which the monk tries to break only to be killed with a staff weapon blast. Before things can degenerate further, Jackson realizes that Oma Desala is actually the one with all the power and has been trying to communicate to him that she is best suited to look after the child. Jackson accepts this and convinces his friends to lay down their weapons so that Oma will not attack them. They reluctantly do so and the Jaffa fire on them, but Oma blocks the blasts then kills all of the Jaffa with lightning and also destroys two Death Gliders. With the Jaffa dead, Oma Ascends the monk and leaves Kheb through the Stargate as she knows the Jaffa will never stop coming as long as Apophis knows the child is on the planet. With the Jaffa gone, SG-1 and SG-2 are able to safely return home.

SG-1's attack on Apophis' Battleship
SG-1, minus Teal'c, is approached by the Tok'ra Anise to take part in an experiment using the Atanik armbands which end up increasing their speed and strength greatly, to up to fifty times human normal. However, the armbands prove impossible to remove and Major General George S. Hammond refuses to let SG-1 out of the base or on missions after their judgment is shown to be impaired by the armbands' effects. As the experiment goes on, Anise brings forth a proposal from the Tok'ra High Council to use SG-1's new abilities to destroy a new type of battleship that Apophis is constructing. An internal attempt at sabatoge by the Tok'ra had already failed, but they believe that SG-1 with their new abilities could succeed. Hammond refuses despite Anise and her host Freya's assertions that the new battleship would give Apophis the edge he needs to gain dominance over the rest of the Goa'uld System Lords, Earth and the rest of the galaxy as he believes Anise has just been manipulating them for exactly this reason and that SG-1 are too judgmentally impaired to perform the mission. Despite orders from Hammond to stand down, SG-1 study the battleship schematics anyway intending to perform the mission while Hammond consults Teal'c on whether the ship is the threat Anise claims it is. Teal'c confirms that it is as it has many advancements over the Goa'uld Ha'tak-class vessels the Goa'uld currently use and as it needs to be destroyed, offers to go by himself to do it. Hammond refuses however as the Stargate on the planet is heavily guarded and Teal'c would be more likely to be killed than succeed. Studying the schematics of the ship and the surrounding area, Major Samantha Carter determines that if they enter the Stargate at a high rate of speed, they will exit at the same speed and can easily take out all of the Jaffa guarding the Stargate though dealing with the ship itself will be much harder as its not enough to just plant C-4 as they have to take out the battleship's power core which is sealed in impenetrable trinium. However, Carter determines that the power core is linked to a cooling system in the facility and if they blow up the cooling pipes, the power core will overheat and explode and destroy the battleship. While the cooling pipes are protected by forcefields, with their ability to run at superhuman speed, they will be able to run right through them. Having come up with a plan, SG-1 arm themselves and enter the Control Room at superspeed where they drug the technicians manning the room, dial the Stargate and lock off the Gate Room and Control Room. Teal'c attempts to stop them, but Colonel Jack O'Neill tells him to stay behind and the rest of SG-1 go through the Stargate at superspeed. Arriving on PX9-757 where the battleship is, SG-1 take out all the Jaffa guarding the Stargate at superspeed without getting hit once despite being fired at with a staff cannon. Arriving at the facility, SG-1 easily take out the Jaffa guarding the entrance and begin to make their way through it only to discover two Jaffa carrying weapons-grade Naquadah. As they can use it to make more naquadah generators, Dr. Daniel Jackson goes after the naquadah while O'Neill and Carter go after the cooling system for the battleship. Using his superspeed, Jackson easily knocks out the two Jaffa carrying the naquadah and when another one arrives and threatens him with a staff weapon while he is collecting the naquadah in a bag, Jackson simply throws one of the blocks of naquadah into the standing Jaffa at superspeed, knocking him out and leaves to meet up with O'Neill and Carter. As Carter theorized, she and O'Neill are able to get through the forcefield surrounding the cooling system without any trouble and plant C-4 with a five minute timer on the pipes. As it will take ten minutes for the power core to overheat after that, it will give them fifteen minutes to get back to the Stargate and Earth which they believe to be enough time. After planting the C-4, O'Neill and Carter start to head for the exit and meet up with Jackson who has begun struggling with carrying the naquadah. As O'Neill and Carter start to leave at superspeed, Jackson collapses and the armband comes off as his immune system has neutralized the virus it uses to interact with and change the human body, reversing the changes it had created in him. As O'Neill and Carter try to help Jackson, two Jaffa corner them, but as one prepares to fire, he is shot with a Zat'nik'tel and collapses. O'Neill and Carter are able to dodge the shot the second Jaffa fires at them and he is shot with a zat too by Teal'c who Hammond sent to help them. While Teal'c carries Jackson, who wakes up, out of the facility, O'Neill and Carter deal with a patrol of Jaffa that are nearby then go after them. However, while O'Neill makes it through a forcefield that appears in the corridor, the armband's effects on Carter wear off and she bounces off the forcefield and is left trapped as the armband then comes off. O'Neill tries to go after her, but he bounces off the forcefield as well and his armband comes off too. Jackson and Teal'c reach the exit, but realizing something is wrong, try to go back only to find their way blocked by a forcefield. Even though the C-4 will blow soon and the ship soon after that, Jackson and Teal'c decide not to leave without their friends. Trying to rescue Carter, O'Neill uses a piece of metal from nearby to break open a nearby control panel and fiddles with it to no avail to try to take the forcefield down. Getting desperate to save Carter as he cares for her more than he should due to their ranks and working relationship, O'Neill desperately smashes at the forcefield and control panel to no avail and refuses to leave her despite her pleas. As two Jaffa approach and Carter and O'Neill prepare to defend themselves, the C-4 explodes, taking out the cooling system and apparently the shield generator as the forcefield separating Carter and O'Neill and the one blocking Jackson and Teal'c go down. The explosion also knocks the Jaffa off their feet, allowing O'Neill and Carter to flee without further problems from them though Carter tries to grab the naquadah which O'Neill has her leave as it will slow them down. SG-1 reunites near the facility entrance and quickly head for the Stargate before the power core explodes and takes out everything. On the path back to the Stargate, the group is ambushed by two Jaffa, but Teal'c zats them. Getting near the Stargate, O'Neill, Carter and Jackson stop, exhausted while Teal'c goes to the DHD to dial Earth, zatting a Jaffa that has regained consciousness nearby. After the Stargate is dialed, O'Neill, Carter and Jackson quickly make their way to it as Teal'c goes back to help them. The battleship explodes as they run, sending out a wave of destruction through the whole area. SG-1 makes it through the Stargate just in time to avoid the blastwave and safely make it back to Earth where they are not court-martialed as they were under the influence of alien technology at the time of their actions.

Skirmish on P3X-888
While being taken on a rite of passage by the Unas Chaka, Dr. Daniel Jackson enters a river filled with primordial Goa'uld and one gives chase to him, trying to take him as a host. Jackson reaches the shore where Chaka catches the Goa'uld as it flies at Jackson and breaks it in half, killing it. Soon afterwards, SG-1, SG-2 and Major Gil Hawkins and Doctor Robert Rothman of SG-11 camp near the river, not knowing its infested with Goa'uld as the Goa'uld have no Naquadah in their systems, preventing Major Samantha Carter and Teal'c from sensing them. In the morning, a primordial Goa'uld attacks Teal'c, but he realizes its coming and kills it with a blast from his Staff weapon. Realizing that one or more of the others may now be a host to a Goa'uld, Teal'c ties them up and leaves them for Major Couburn to find. Soon afterwards, Hawkins breaks free of the restraints, revealing himself to be a Goa'uld and goes to shoot Colonel Jack O'Neill with an FN P90 Defense Weapon only to be shot twice in the back with a staff weapon by Teal'c and killed. Teal'c reveals that the whole thing was a test to see who was a Goa'uld and who wasn't as a Goa'uld could've easily broken free, but as he goes to free Rothman, Rothman reveals himself to be a Goa'uld, breaks free, overpowers Teal'c and wounds Captain Michael Griff with his staff weapon. However, before he can do more, O'Neill shoots Rothman dead with a P90. While the rest of SG-1 carry on to rescue Jackson, Griff and Pierce remain behind to bury Griff and Rothman.

Osiris' return on Earth
Dr. Sarah Gardner opens a stasis jar and releases Osiris who takes her as a host. Using Sarah's connection to Doctor Daniel Jackson, Osiris tries to learn more about Earth and the Stargate, but Jackson refuses to tell him. After killing three people, Osiris tracks Jackson, Major Samantha Carter, Dr. Janet Fraiser and Dr. Steven Rayner to the tomb in which the Osiris jar was originally found and dons the garb of his queen Isis as he is now in a female host and badly beats Steven before attacking the team. Osiris defeats Carter and Fraiser and tortures Jackson for information on Isis and the other Goa'uld and is pleased to learn of the deaths of Ra, Hathor, Seth and Sokar as some of his opponents to rise to ultimate power are gone. As Osiris tortures Jackson, he manages to inject him with a powerful sedative, causing him to weaken. Unable to fight further, Osiris activates an Archaic Tel'tak and activates a set of Transportation rings. Carter shoots at Osiris, but the rings block the shots and Osiris escapes to his ship and flees the planet.

Cronos' attack on Juna
Some time after the People of Juna rebel against Heru'ur and bury their Stargate, Cronus arrives in his ship and takes over the planet, unburying the Stargate. As the Naquadah mine is dry it is theorized he likely did it for strategic reasons. After Cronus' takeover, the robot Colonel Jack O'Neill, Teal'c, Major Samantha Carter and Dr. Daniel Jackson arrive on an exploratory mission and are captured by the people of Juna and a Jaffa, led by Darian, but the robot O'Neill manages to escape. That night he captures Darian and his wife Hira and tries to explain to them the truth about him and his team and after learning how Cronus took control of the planet, tries and fails to convince them of the truth about Cronus and Heru'ur so he leaves. The next day, Cronus returns in his ship and is pleased to learn of the capture of what he believes to be SG-1. Cronus holds a gathering attended by the warriors of Juna and robot O'Neill disguised as a Juna warrior. As a reward for his loyalty, Cronus orders Darian to kill robot Jackson and has his Jaffa hold the people hostage to force him to do so. Robot Jackson signals robot O'Neill not to interfere and Darian blasts robot Jackson with a Staff weapon, decapitating and "killing" him, but shocking everyone including Cronus as it reveals his true nature as a robot. Meanwhile, Harlan comes to Earth worried about the robot team as they are overdue and gives the real team (minus the real Dr. Daniel Jackson who is on a mission) the location of the planet they went to. As Stargate Command dials the gate and sends a MALP, robot O'Neill takes out the Jaffa guarding the gate and uses the MALP to communicate with Earth. He is joined by Darian who, after seeing Cronus' reaction, came to realize that he is not a god after all and wants to help. After learning of the situation, SG-1, minus Jackson travel to the planet. On his ship, Cronus orders his Goa'uld scientist Ja'din to find out how the robots work and she "tortures" robot Carter and Teal'c for information on how the deactivated power pack on robot Jackson works. At the same time the real team comes up with a plan: use the Transportation rings in the Pyramid to reach the ship with the plan to travel to the Pel'tak (the bridge) and seal off the other levels to keep the Jaffa out while they kill Cronus and then offer the Jaffa freedom. On the ship, after being contacted by robot O'Neill, robot Teal'c offers a deal in exchange for robot Carter's freedom, but instead uses the opportunity to attack Cronus, overpowering one Jaffa and killing the other with his staff weapon, though that Jaffa gets off a shot that kills the other, before shooting Cronus who uses his Kara kesh's shield to block it, causing robot Teal'c to start strangling him. Robot O'Neill is taken by Darian to see Sindar, pretending to be a prisoner before the two attack, killing Sindar while the rest of the team enters and helps take out the remaining Jaffa, but robot O'Neill is badly damaged by three staff blasts. Robot Carter tells Ja'din how to reactivate the power pack, but in reality tricks her into activating a Self-destruct that kills her and frees robot Carter, who takes out the Jaffa guarding the rings and transports up the team, leaving behind robot O'Neill and Darian. Teal'c rushes to the Pel'tak where robot Teal'c is shot in the back and mortally damaged by another Jaffa who Teal'c shots with a Zat'nik'tel then uses as a shield to try to no avail to shoot Cronus before Cronus shoots both the Jaffa and Teal'c, killing the Jaffa and wounding Teal'c, allowing Cronus to begin crushing Teal'c's symbiote to painfully kill him. Robot Carter, Major Samantha Carter and Colonel Jack O'Neill travel to a circuit breaker to close the area off and robot Carter pulls the crystals as its protected by a force field, getting electrocuted the whole time while O'Neill and Carter cover her. Robot Carter successfully pulls the crystals and closes off area, but "dies" from the damage she sustained doing it. On the Pel'tak, Cronus continues trying to kill Teal'c, but robot Teal'c manages to grab a staff weapon and shoots Cronus in the back with it three times, killing him and saving the real Teal'c. Robot Teal'c "dies", proclaiming he did it for his and real Teal'c's father Ronac who Cronus had killed in the same way he tried to kill Teal'c. The invasion ends and SG-1 ends up capturing Cronus' ship, but robot O'Neill "dies" of the damage he sustained from the staff blasts and his power running out. With Cronus dead, O'Neill has Darian get any people who believe that still believe Cronus is a god so they can be shown Cronus' body as proof that he's not.

Skirmish on Memphis
During a mission to Memphis to check out intelligence received from the Tok'ra on the Goa'uld building a base there, SG-1 comes across Tanith and are forced to flee to the Stargate chased by Death Gliders and Tanith himself in an Al'kesh. Colonel Jack O'Neill, Major Samantha Carter and Teal'c (armed with a Staff cannon) guard Dr. Daniel Jackson as he dials the Stargate and everyone but Teal'c rush through it after it opens. Teal'c, upon seeing Tanith in the cockpit of the Al'kesh, waits until it gets closer and then uses his staff cannon to destroy the cockpit, killing Tanith and causing the ship to crash into the Dial Home Device as Teal'c escapes through the Stargate, cutting the wormhole off in transit. Eventually, Teal'c is rescued from the Stargate and shares the good news of Tanith's death with the team.

Goa'uld invasion of Steveston, Oregon
After Dr. Richard Flemming and Dr. Peter Stofer of Immunitech Research cloned a Goa'uld, there was a lab accident and Flemming was taken as a host and Stofer disappeared. Because the symbiote was immature they were only able to control the host while they were asleep. Flemming proceeded to infest the majority of the population of Steveston, Oregon and began building a ship to escape the planet. Flemming realized what was happening and contacted Major Samantha Carter but was run off the road and killed in a car crash. SG-1 minus Colonel Jack O'Neill traveled to Steveston and began investigating. They searched Flemming's house and accepted a package containing a syringe that was sent from Flemming. The next day, Jonas Quinn noticed several of the residents behaving strangely and that the shipyard had seen recent activity despite it's closure several months ago. After breaking in to the shipyard, they discovered the ship and realized they townspeople were infested with Goa'uld. That night Teal'c and Jonas staked out the warehouse and were detained by NID Agents Cross and Singer. They explained that they have been monitoring the situation for three months and are waiting for the Goa'uld to complete the ship. At the hotel, Carter discovered the syringe contained an antibiotic designed to kill the symbiote and injected herself before the townspeople kidnapped her and implanted her with a symbiote. When Cross realized the situation was out of control he radioed a containment team, but Singer had been taken as a host and shot the three of them with a Zat'nik'tel. Luckily, Carter's symbiote died shortly after implantation and she was able to stop Cross and Singer from infecting the NID and call in backup. The townspeople were then treated with the antibiotic and the event was covered up.

Ba'al's capture of Jack O'Neill
After Colonel Jack O'Neill was infected with an Ancient contagion and was implanted with a Tok'ra named Kanan, he disappeared from a Tok'ra base and traveled to Ba'al's outpost. He attempted to rescue Ba'al's lo'taur Shallan but was captured by Ba'al's Jaffa after Kanan fled his body. He was revived in a Sarcophagus and questioned by Ba'al. He insisted he did not know why Kanan came to his planet. Ba'al tortured him to death several times and revived him with the Sarcophagus. While in his cell, O'Neill was visited by an ascended Dr. Daniel Jackson who offers him ascension but O'Neill refused and asked him to help him escape but Jackson could not interfere because it was against the rules. Eventually, SG-1 figured out what Kanan was up to, but the outpost was too heavily fortified for an attack. Knowing that he was unable to help directly and that all O'Neill needed was a fighting chance, Jackson planted the idea in Teal'c's mind that if they informed another System Lord about the outpost which Ba'al had kept a secret, they would attack with a Ha'tak and it could be used as a distraction for O'Neill to escape. The SGC informed Lord Yu-huang Shang Ti, asking that he target the power generators first. Yu attacked, knocking out the generators first as asked, allowing O'Neill to escape his anti-gravity cell after Jackson let him know what was happening and overpower the Jaffa guarding him. Following Kanan's last wish, O'Neill took Shallan with him and they managed to escape to Earth in the chaos of the attack.

Her'ak's capture of SG-1
While babysitting a group of scientists on P5X-112, SG-1 was captured by Her'ak and taken aboard a Ha'tak. Two of the scientists, Dr. Jay Felger and Dr. Simon Coombs, ringed up to the Ha'tak to rescue them. Colonel Jack O'Neill explained that they were captured on purpose to meet with an undercover Tok'ra named Khonsu. O'Neill had the undercover Rebel Jaffa Dol'ok hide them on the ship. After arriving on Khonsu's World, Her'ak killed Khonsu because Anubis knew of his true identity for some time and used him to capture SG-1. Dol'ok and another rebel Jaffa were also killed but Felger and Coombs were not discovered. Felger realized something was wrong and took their armor and ringed down to the planet. They snuck into the Pyramid and made their way to the control room. They were able to deactivate the forcefield in SG-1's cell and Coombs directed them out of the pyramid from the control room. When the reached the Stargate, SG-1 was able to take out the Jaffa but Coombs was cut off from the ring room. O'Neill had Coombs ring himself and Teal'c into the pyramid and they took out the Jaffa blocking Coombs exit. The three of them ringed back to the gate and they escaped back to Earth.

Skirmish on P3X-367
After SG-4 returned from P3X-367 with Alebran, they informed SG-1 that Nirrti was experimenting on the People of P3X-367. After Alebran became sick and died from cellular breakdown, SG-1 and SG-4 traveled to 367 and took out the Jaffa guarding the fortress. Once inside, they discovered the inhabitants had been severely altered with Wodan possessing Telekinesis and Eggar possessing Telepathy. They explained that Nirrti had cured them of a disease and that they were expecting her back soon. Jonas Quinn and Teal'c went with Wodan to the basement and were attacked and imprisoned. Colonel Jack O'Neill and Major Samantha Carter stayed to study the machine. When O'Neill lost contact with SG-4, he went to investigate and Nirrti ringed into the room and shot Carter with a Zat'nik'tel. When O'Neill returned, he tried to shoot one of Nirrti's Jaffa but Wodan stopped the bullet in midair. Nirrti then imprisoned the two with Jonas and Teal'c. Nirrti then placed Lt. Colonel Sergei Evanov in the DNA resequencer and Nirrti manipulated his DNA. When she was done she returned him to the cell and did the same to Carter. When she moved on to Jonas, she told him that she could give him great power but he told if she did he would use them to kill her. Back in the cell, Evanov died of cellular breakdown. After Jonas refused to join her, Nirrti brought O'Neill to machine. On the way O'Neill was able to convince Eggar to read Nirrti's mind. When they entered the room, Eggar read her mind and discovered that she was not a god. He informed Wodan that she killed Alebran and Wodan used his power to break her neck but not before Eggar was able to learn how to work the machine. Eggar used the device to reset Carter and themselves before destroying it.

Skirmish on P4S-237
When the inhabitants of P4S-237 requested assistance in defeating the Goa'uld Mot, Colonel Jack O'Neill, Teal'c and SG-15 went to the planet to set up an ambush. During a meeting with the village leader Ellori, Chazen used a Shock grenade to stun them and informed Mot. Mot tried to set a trap by allowing Natania to free the prisoners and ambush them at the Stargate to get access to Stargate Command. Luckily, Jonas Quinn used his Precognition to warn them by radio. The warning was heard by Chazen who sounded the alarm. Mot attempted to kill Chazen but was shot by Natania. Because the alarm was sounded, the team was able to avoid the ambush and kill the Jaffa at the gate. They traveled back to the SGC and assembled SG-3 and 10 as reinforcements before returning and defeating the remaining Jaffa.

Skirmish on P5S-117
In order to stop the Avenger virus, Major Samantha Carter and Dr. Jay Felger traveled to P5S-117, the planet where the virus was sent by Stargate Command in the first place. There they learn that Ba'al upgraded the virus and spread it to the Stargate Network in order to gain more power due to his vast fleet. Unfortunately, this means the anti-virus program they brought would have to be modified. While Felger works on fixing the anti-virus, the two are found by a Jaffa patrol and Carter gets into a firefight with them to buy time. The two are nearly overrun, but Colonel Jack O'Neill and Teal'c arrive in an Al'kesh and drive off the Jaffa. Afterwards, Felger successfully brings an end to Avenger and makes it so the virus can never be used again.

Ambush of Anubis' Kull warrior
After Teal'c and Bra'tac were attacked by Anubis' new Kull warrior, SG-1 minus Dr. Daniel Jackson, SG-3 and Bra'tac set up an ambush on Ramius' homeworld with the help of the Rebel Jaffa hiding in Ramius' Jaffa. When the Kull warrior came through the Stargate and headed towards the Pyramid, Major Samantha Carter trapped it in a Tok'ra shield and Colonel Jack O'Neill shot it with a Tranquilizer gun but it had no effect. The supersoldier then escaped the shield and killed three Jaffa and wounded Colonel Albert Reynolds and other members of his team. O'Neill then ordered the detonation of the A-M18A1 Claymore mines and C-4 but the supersoldier was unharmed. It proceeded to the pyramid and the team was captured by Ramius' Jaffa. They are placed in a cell until the supersoldier attacks the pyramid and kills Ramius. They are then released by the Jaffa guarding them. Carter and Teal'c steal a Tel'tak and use the Transportation rings to bring the supersoldier aboard and vent the atmosphere to knock it unconscious and bring it back to Earth.

Tau'ri attack on Tartarus
After capturing a Kull warrior and using a Tok'ra memory recall device to learn the location of its homeworld of Tartarus, Major Samantha Carter, Teal'c, and Bra'tac took a Tel'tak to the planet and hide behind one it's moons while Jacob Carter used the Kull armor to get pass the Stargate shield and enter the facility. Jacob was stopped by Thoth and placed in a machine for repairs but Thoth was pulled away by Anubis and Jacob was able to deactivate the sensors and let them in the base. They began to search and discover a Queen that was preparing to spawn thousands of symbiotes with no genetic memory to brainwash them to serve Anubis. They plant C-4 to ensure the Queen is not allowed to spawn again and continue the search. They come upon a large room where Anubis is addressing several hundred supersoldiers and they are discovered by Thoth. Carter shoots him and the alarm sounds. They detonate the C-4 and head for the Tel'tak. They are chased by several supersoldiers and one is able to board the Tel'tak. It It attacks them but Bra'tac is able to ring it outside the ship.

Skirmish with Osiris
Osiris comes to Earth using an Al'kesh and beaming technology with plans to probe Dr. Daniel Jackson's mind with a memory recall device while he is asleep for the location of the Lost City of the Ancients, believing that the location is buried in his subconscious from the time when he was Ascended. Osiris pretends to be her host Sarah Gardner, but deviations from how he remembered things alert Jackson to something not being right and the team realize what must be going on and come up with a plan: they will allow Osiris to probe Jackson's mind one last time in an attempt to learn the location for themselves, but will use new jamming technology to block her ability to beam out. After she finishes, they will use a tranquilizer gun which they know can penetrate her shields and knock her out so the Tok'ra can remove Osiris from Sarah and save her. Eventually, Jackson realizes he never knew the location of the city and Osiris tries to kill him, but is attacked by Colonel Jack O'Neill and Teal'c, but shoots them with her Kara kesh them and tries to beam out. Osiris is unable to beam out to her frustration and heads outside where she engages Major Samantha Carter and Pete Shanahan in battle, but they are unable to penetrate her shields and she blows up the surveillance van containing the jamming equipment with a Zatarc ring, severely wounding Pete. Before Osiris can do more, a recovered O'Neill tranquilizes her from behind. Osiris is removed by the Tok'ra and presumably killed and Sarah is finally set free from the hell she had to live through for the past three years.

Anubis' attack on the Alpha Site
After Anubis learned the location of the Alpha Site, he launched an attack. The Stargate was hit by an Al'kesh and several Kull warriors landed in Tel'taks. Major Samantha Carter and Jacob Carter were there working on the Kull disruptor when the attack began. Lt. Glenn came to inform them that Colonel Reilly ordered an evacuation. As Carter and Jacob were downloading the data onto a crystal before deleting it Glenn was shot in the back by a supersoldier. Jacob managed to kill it with the disruptor and they both headed into the forest as the self-destruct was set off by Reilly. Jacob was caught in the explosion and a tree fell on his leg while Carter was chased into the forest by a supersoldier. SG-1 and SG-3 came to search for survivors and discovered Jacob who gave them the disruptor and told them Carter had a full power unit. Dr. Daniel Jackson went back to Stargate Command with Jacob while Colonel Jack O'Neill and Teal'c went to search for Carter. Major General George S. Hammond sent out an Unmanned Aerial Vehicle with missiles but it was shot down by the supersoldier. Carter was able to make her way to the crash site and fire the missile at the supersoldier but it did not kill it. Luckily, O'Neill and Teal'c arrived and Teal'c was able to draw the supersoldiers' attentiton so O'Neill could get the new power unit and kill it.

Skirmish on P3X-666
On a standard exploration mission of Ancient ruins on P3X-666, SG-13 came across a Goa'uld Reconnaissance probe. After a brief fire fight, they were able to neutralize it with a Colt M203 grenade launcher, but not before it sent out a sub-space signal informing Anubis of what had happened. Deeming the world to be safe, at least for the immediate future, Stargate Command allowed SG-13 to continue to study the ruins they had found with SG-3 as backup. However, Major Samantha Carter soon realized that the probe had sent out a sub-space signal. Moments after SG-13 received this message, Anubis' forces had already arrived on the planet. With Senior Airman Simon Wells subsequently injured via staff weapon blast, Colonel David Dixon sent Dr. Cameron Balinsky back to the SGC for reinforcments. Major General George S. Hammond sent several SG teams including SG-1, SG-3, and SG-5 to extract them while Dr. Janet Fraiser stabilized the wounded Wells. When they arrived on the planet, they were immediately faced with an army of Jaffa and several Al'kesh. Taking cover in the ruins, they were able to hold of the Jaffa while Janet tended to Wells. With the help of Dr. Daniel Jackson, the man was quickly stabilized, but not before Janet herself was hit by a staff blast and was killed instantly. Meanwhile, Colonel Jack O'Neill was shot in the torso by a staff weapon, however, the wound was not fatal due to the new vest inserts. After the battle, a memorial service for Janet was held where Carter read the names of those who, instead of having given their lives for their country, were still alive and serving due to Janet's excellent care. Among the many lives saved by Dr. Fraiser, and listed by Teal'c and Carter at Janet Fraiser's memorial service, was the whole SG-1 team, Wells, Major Ian Hules and Sgt. Connie Smith.

Skirmish on P3X-439
The Goa'uld System Lord Anubis sent a Reconnaissance probe to the planet P3X-439 to scout, which discovered the secrets the planet held. SG-1, SG-3, and SG-5 arrived first in an attempt to extract the information from the Ancient Repository of knowledge but were stopped by the arrival of Anubis' fleet. Flanked by Death Gliders and Al'kesh, SG-1 destroyed the Repository of knowledge with C-4 after Colonel Jack O'Neill took the drastic step of interfacing with the device, and downloading the Ancient knowledge into his brain. The three SG teams then escaped back to Stargate Command through the Stargate.

Anubis' infiltration of Stargate Command
While working to adjust the orbit of the International Space Station to avoid a piece of debre from Anubis' fleet, Cosmonaut Anatole Konstantinov was possessed by Anubis. He returned to Russia and became ill. He was visited in the hospital by his friend Russian Air Force Lt. Colonel Alexi Vaselov and Anubis left Konstantinov for Vaselov because of his recent assignment to Stargate Command. After Vaselov arrived at the SGC, he requested permission to join SG-1 but was denied by Brigadier General Jack O'Neill. Vaselov was visited by Dr. Daniel Jackson and Anubis entered his body. After Vaselov was taken to the infirmary and Dr. Brightman discovered lesions on his body, O'Neill stopped Anubis in Jackson's body from going through the Stargate. Anubis then took a hostage and shot two guards before Teal'c shot him with a Zat'nik'tel and O'Neill shot him in the shoulder with his sidearm. After Jackson was taken to the infirmary, Anubis left his body for Lt. Evans. When Jackson regained consciousness and discovered that Anubis was responsible, he remembered Anubis leaving his body for Evans. After Evans was detained, it was discovered that Anubis had left her body as well. After O'Neill ordered blood tests for all base personnel to check for elevated white blood cell counts, Airman Malcolm McCaffrey missed his test. They began a search and Anubis attempted to flee through the gate but O'Neill shot him with a Zat and Anubis left McCaffary and went through a wall. In order to force Anubis to use his ascended powers and alert the Others, O'Neill put the base in a three section lockdown. After several days under lockdown, O'Neill was ordered by President Henry Hayes to resume normal operations. O'Neill made a fake announcement that the lockdown would be held indefinitely to force Anubis to act. Anubis in the body of Lt. Colonel Samantha Carter bypassed security and set up a program to dial the gate. On his way to the gate he was shot with a Zat by O'Neill and left Carter for O'Neill. Anubis then tricked Major Kearney into setting the self-destruct before shooting him with a Zat. Anubis headed to the Embarkation Room and waited for his program to dial the gate but was stopped by Vaselov and convinced to leave O'Neill for Vaselov before entering the gate. Luckily, Carter was able to change the address to KS7-535 and Anubis was frozen solid on the other side.

Skirmish on P2X-887
After one of Anubis' former Jaffa gave intel on a base on P2X-887, Brigadier General Jack O'Neill sent SG-1 and SG-3. Lt. Colonel Samantha Carter ordered SG-3 to guard the Stargate while SG-1 searched for the secert base. After activating the Transportation rings, SG-1 was unable to get out of the base. Meanwhile, an Al'kesh flew over the gate and Colonel Albert Reynolds contacted Stargate Command for reinforcements to search for them. When the teams returned and reported no sign of SG-1, Ba'al contacted the SGC and said he had captured SG-1. He offered their release in exchange for Camulus. After O'Neill released Camulus, SG-1 dialed in from 887 and informed O'Neill that they had been traped in the base and not captured by Ba'al but were attacked by Ba'al's Jaffa on their way to the gate. They were able to fight off the Jaffa and head back through the gate.

Moloc's attack on the Hak'tyl
During a meeting of the Rebel Jaffa in Moloc's army, Moloc came to Hak'tyl ll himself in order to wipe out the resistance. All were killed except Teal'c, Ishta and Aron whom Teal'c did not trust. During the night Ishta is captured by Moloc's soldiers and tortured by Moloc himself. Teal'c shot Aron with a Zat'nik'tel as he could not trust him. After Stargate Command sent an Unmanned Aerial Vehicle and it was shot down, Teal'c located the crashsite and retrieved the Tretonin and laser designator but was surrounded by Jaffa. Luckily, Aron arrived and helped Teal'c kill the Jaffa. Teal'c launched a rescue mission for Ishta while Aron uses a laser designator to designate two missiles sent by the SGC onto Moloc, killing him and his Jaffa. Teal'c takes out all of Moloc's remaining Jaffa on the planet and comes into contact with Moloc's First Prime, Cha'ra, who is using Ishta as a hostage. He shoots him with a Zat and knocks him out (who later joins the Jaffa Rebellion) and successfully rescues Ishta.

Goa'uld attack on Prometheus
After the Prometheus is hijacked by Vala Mal Doran in an attempt to sell it to the Lucian Alliance for weapons grade Naquadah, Dr. Daniel Jackson is able to take back the ship but unable to stop the ship from finishing its course to its destination. The ship lands on a planet where Tenat and Jup are waiting for Vala. When she does not show but Jackson in her stead they are still willing to go through with the trade, which he turns down. When suddenly several Death Gliders start to fire on the unshielded Prometheus. Jackson shots the two mercenaries with a Zat'nik'tel and gets to the ship in order to escape but needs Vala's help in order to unlock the systems, and together they engage the several Death Gliders and Al'kesh, but they run out of weapons and their shields fail before they can take them all out. Then the Al'kesh controlled Lt. General George S. Hammond and the crew of the Prometheus comes in and helps finish off the remaining forces. Both ships quickly escape before they have to engage a nearby Ha'tak mothership. After the battle Vala is able to escape on the Al'kesh.

Ares' attack on Arkhan's World
The Goa'uld Ares decides to return to and take over the planet where Harold Maybourne used to live on so he sends his First Prime, Trelak and some ground troops as an advance party and comes himself in his mothership. SG-1 is already on the planet and is attempting to get the people to leave, but they believe that the Goa'uld will be defeated and refuse to go. Trelak recognizes Teal'c and Dr. Daniel Jackson among the villagers and sends men to find Lt. Colonel Samantha Carter, who along with Brigadier General Jack O'Neill, are trying to a get a Time Jumper they found working again. They barricade themselves inside and when Carter gets power hooked up, take off and fly into space to confront Ares' mothership. The distraction caused by the Jumper flying overhead allows Jackson and Teal'c to take the offensive and together with the help of Garan, they kill all of Ares' Jaffa and Trelak. In space, the Jumper comes up against the mothership which fires at them but misses. O'Neill fires two Drone weapons at it but after that the Jumper's weapons are depleted. Luckily, the drones hit some vital systems and the mothership is destroyed, killing Ares.

Goa'uld infiltration of the Trust
After the Stargate was recovered by the Prometheus and The Trust Al'kesh fled to hyperspace, the Trust agents in it attack a few more Goa'uld worlds and are captured by an unknown Goa'uld. They are implanted with Goa'uld's and sent back to Earth to implant the rest of the Trust. As part of a plan to cause a nuclear war to destroy Earth so they can presumably get control of the Antarctic outpost in Antarctica, the Trust use an agent to implant Russian General Miraslov Kiselev with a Goa'uld and also implant former Vice President Robert Kinsey. Stargate Command becomes aware of their plan somewhat due to Kinsey warning Brigadier General Jack O'Neill that the Trust are planning something. Dr. Daniel Jackson travels to Russia to try to figure out what's going on while the Trust send the Goa'uld-Kinsey to pretend to attempt to assassinate Kiselev so the Russians believe the Americans have been compromised by the Goa'uld. While all of this is going on the Prometheus conducts an unsuccessful search for the Trust's Al'kesh. Jackson is detained and checked for a Goa'uld before being shown Kinsey who is now a prisoner. Meanwhile the Kremlin stops taking calls from President Henry Hayes due to fear he has been turned into a Goa'uld. Working with Russian Colonel Chekov, Lt. Colonel Samantha Carter and O'Neill attempt to stop the threat. Carter figures out Kiselev is a Goa'uld and Chekov manages to get O'Neill a direct line to the Russian President Mikhailov through friends of his in an attempt to convince him of the truth. In Russia, Jackson goes to see Kinsey and as one of the Trust's agents goes to detain him, manages to escape with Kinsey by activating a locator beacon, signaling the Prometheus to beam him on board. In a desperate attempt to destroy the ship, the Trust Al'kesh launches an attack on the Prometheus while its shields are down, doing some damage. Prometheus raises shields and starts to battle the Al'kesh while Kinsey manages to escape and rings to the Al'kesh. In the SGC, Carter, O'Neill and Chekov try to convince Mikhailov of the truth, and while he does hear them out, he's reluctant to believe them even when sent evidence as he's worried they may be compromised as well. They lose the connection just as Kiselev attempts to launch a nuclear attack without authorization. On the Al'kesh, Kinsey kills Jennings, the Trust agent piloting it and possibly beams away. The Prometheus shields hold under the onslaught from the Al'kesh at 40% and the ship gets an opportunity to destroy the Al'kesh with Jennings' death as the Al'kesh is defenseless. Colonel Lionel Pendergast, the ship's commander, is reluctant to fire but gives the order when the Al'kesh powers up again. Prometheus fires two missiles and destroys the Al'kesh, possibly killing Kinsey. On Earth, it looks like Russia and the US are about to go to nuclear war, but the Russian President apparently decides to believe O'Neill and stops Kiselev who is presumably arrested and the situation is defused. Presumably, Kiselev and the known Trust members in Russia are then freed from their Goa'ulds, although much of the Trust is still infected with Goa'ulds.

SG-1 stranded in Ancient Egypt
After using the Time Jumper to travel back in time 5,000 years to ancient Egypt to steal a Zero Point Module, SG-1 meets Katep and Salatis. They joined them on a pilgrimage to Ra's temple to make an offering. When Ra was displeased with the offering, he ordered his Jaffa to kill Salatis. After Ra left SG-1 shot a Jaffa with a Zat'nik'tel and Teal'c took his Jaffa helmet and armor to gain access to the treasure room. Teal'c is able to retreive the ZPM and they head back to the Jumper but it had been covered up by a sandstorm and was discovered by Ra's Jaffa. Despite Brigadier General Jack O'Neill wanting to retake the Jumper, Lt. Colonel Samantha Carter would not allow them to as it would change the timeline. After several years of gathering weapons and tying to recruit people to start a rebellion, there attempts were discovered and O'Neill, Teal'c and Carter were exacuted. Dr. Daniel Jackson was able start the rebellion over again and it succeeded in expelling Ra from Earth but he took the Stargate with him causing an alternate timeline.

Alternate Earth's Skirmish on Chulak
After the timeline was changed due to SG-1's involvement, the alternate timeline versions were able to find the Beta Gate in Antarctica and use the Time Jumper that was uncovered in Giza, Egypt to travel to Chulak. Once through the gate, Colonel Jack O'Neill landed near the city and he, Dr. Daniel Jackson, Dr. Samantha Carter, Major Charles Kawalsky and Senior Airman Jake Bosworth head towards the city. On the way, they are stunned by a Goa'uld Shock grenade and taken prisoner. After trying to convince Teal'c to join them, Jackson is taken to Apophis who impants him with Goa'uld symbiote to be used as a spy. Teal'c brings them their gear and Carter shows him the camcorder video of his alternate self. Jackson is then returned to the cell and they use C-4 to escape. On the way back to the Jumper, Teal'c is waiting for them and kills Jackson. They head to the Jumper and take off but Kawalsky, Bosworth, Donner, and Mansfield are killed. Once in the air, O'Neill uses the ship to time travel to avoid the Death Gliders that were chasing them.

Alternate Earth in Ancient Egypt
After travel back in time on Chulak, Colonel Jack O'Neill, Dr. Samantha Carter and Teal'c head through the Stargate to Earth. They head into the nearest village and are greeted by Katep. He takes them inside so they are not seen by a Jaffa patrol. Once inside, Dr. Daniel Jackson enters and shows them the hidden weapons cache. They then begin to plan an attack that ensures the gate does not get taken by Ra and Carter works to fix the Time Jumper's cloak. While she is working, the Jumper is discovered by Ra's Jaffa and Teal'c and Jackson bring the villagers to help rescue them. Later, the rebellion is successful and Ra leaves without the Stargate.

Ba'al's infiltration of the Trust
After the Battle of Dakara, Ba'al sought refuge on Earth and took control of the The Trust. When Gerak of the Free Jaffa Nation discovered this, he sent troops to Earth and attacked a Farrow-Marshall Aeronautics warehouse in Edison, Virginia. He was able to capture a Goa'uld inside of Alex Jameson but was of his Jaffa was left behind and hit by a car and killed. After Teal'c and Lt. Colonel Cameron Mitchell traveled to Dakara to confront Gerak, he denied any knowledge of the Jaffa's presence but Teal'c believed he was lying. Lt. Colonel Samantha Carter Dr. Daniel Jackson began investigating Farrow-Marshall but Carter was stonewalled by Charlotte Mayfield. Teal'c and Mitchell began asking around Dakara and Ka'lel informed them that the Jaffa died attempting to capture Ba'al. After the Goa'uld inside of Alex Jameson was tortured into giving the location of Ba'al's hideout, a group of Jaffa lead by Yat'yir raided an office building by Ba'al was able to escape. Following the attack, Ba'al sent a message to Stargate Command and told them he would follow Earth laws if he was left alone and had placed a Naquadah bomb in a building in the United States of America that he would detonate if another attempt on his life was made. After Agent Malcolm Barrett and the NID discovered Ba'al's location, Carter and Jackson joined him on a stackout. When Ba'al went public by having a news conference announcing his purchase of Hammel Technologies, Major General Henry Landry called off the assignation to avoid a media circus. After Ba'al returned to a Trust facility, Landry ordered an attack on the facility with Symbiote poison but the Trust was able to intercept the transmition and Ba'al activated the bomb in a building in Seattle, Washington. After the building was evacuated, Mitchell had the Prometheus beam the building into space. Meanwhile, Landry launched the symbiote poison but Ba'al was not there. Teal'c went to Dakara to talk to the Jaffa High Council when Gerak brought in Ba'al and exacuted him. Teal'c returned and the rest of the team informed him that cloning technology was found in the facility.

Khalek's attack on Stargate Command
When SG-1 finds an Ancient lab on P3X-584 formerly controlled by Anubis, they have no choice but to explore, they find a DNA resequencer of Ancient design and a stasis pod containing a young man. The young man is released from stasis and taken to Stargate Command. He tells them his name, Khalek, and that he was a captured by a Goa'uld. But all this was a rouse which is later found out by Dr. Daniel Jackson after searching the logs in the lab. He was in fact the son of Anubis, half Human and half Goa'uld, and possessing the entire Genetic memory of Anubis before his ascension and a genetically advanced body on the verge of ascension. He was designed to be a foot soldier capable of ascending and taking over the ascended planes from the Ancients in an attempt to not only control the galaxy but the entire universe. But SG-1 was able to stop their plan. They plan to hold Khalek in a specifically designed room to contain such a hostile and dangerous creature to stop him from getting any more treatments from the manipulation machine to stop him from ascending and either put him in stasis or kill him. Richard Woolsey arrived and informed Major General Henry Landry that the International Oversight Advisory has decided to not put him in stasis but study him in an attempt to find a way to fight the Priors of the Ori. When Major Altman hooked up the Ascendometer to Khalek, Khalek overloaded a monitor injuring Altman and tried to escape but was shot by Lt. Colonel Cameron Mitchell. After Landry overruled the IOA and was about to send Khalek back to 584, Jackson returned and informed him that Khalek needed more time in the machine so 584 is the last place he should be sent. Khalek used his advanced hearing to listen in and was able to escape. He proceed to the Embarkation Room and headed back to 584 through the Stargate. Fortunately, Lt. Colonel Samantha Carter reset the Call forwarding device to send him back to the SGC. As he returned through the gate, Mitchell was able to distract him long enough for Jackson to shoot him and together they shot him several times, killing him. Because of their encounter with Khalek they were able to construct a weapon capable of disabling advanced mental powers for a temporary time, this helped in their victory in fighting the Ori.

Trust attempt to destroy Atlantis
Due to transmissions picked up from members of The Trust, Agent Malcolm Barrett of the NID alerts Stargate Command of a Trust plan to destroy Atlantis on the next scheduled dial-in through a planted bomb. The SGC manages to make contact with the Daedalus which is on route back to Earth by sending an SG-5 to P4M-399 and warns them of the plan so they can relay the message to Atlantis. The Daedalus, pushing its hyperdrive to the limits, manages to get into range of Atlantis and warn them just in time of the threat, stopping the dial-in at the last second. The Daedalus is recalled to help with the investigation while the team looks for the operative who they believe to be human as he's supposed to be a low-level member of the Trust. Due to the suspicious activities of Dr. Peter Kavanagh, he becomes the prime suspect in the case. At the same time, the NID raids a Trust compound and finds computers with some further intelligence on the plan. They don't learn much as the data is cryptic, but they do learn that there's no transmitter on Earth to detonate the bomb, that its something on the Atlantis end that will cause the bomb to detonate. Dr. Rodney McKay discovers that the city's Zero Point Module failsafes had been disabled and that dialing Earth would have caused the ZPM to overload and explode. In order to reverse this, the command code of the person responsible is needed. The city's systems have also been programed to help this happen, trying to dial Earth which is unsuccessful due to the Stargate's control crystal being removed while at the same time broadcasting a brief distress message with Atlantis' transmitter to draw two nearby Wraith cruisers in order to force the city to be cloaked to give it another opportunity for an overload. When the city cloaks, the program activates the inertial dampeners which, combined with the cloak, cause the ZPM to start to overload. With no other choice and unable to use the Stargate, the Daedalus and the city's Puddle Jumpers take the expedition to the Light Bugs' Planet, the nearest inhabitable planet in the Lantean system. Seeing no other option, Dr. Elizabeth Weir reluctantly agrees to let Ronon Dex torture the information out of Kavanaugh, but he faints before Ronon can start. At the same time, Lt. Laura Cadman discovers two deletions in the city's records with Colonel Steven Caldwell's command code attached. The team quickly stops Ronon's attempt to torture Kavanaugh and have Hermiod beam Caldwell to Atlantis' conference room to be questioned. Upon being confronted by the evidence, Caldwell reveals that he is actually a host to a Goa'uld Trust agent who is the one doing the sabotage. The Goa'uld refuses to give up the command code so Lt. Colonel John Sheppard Tasers him, injuring the Goa'uld and allowing Caldwell to regain control of his body at least temporarily. Caldwell, although in a lot of pain from the Taser and his fight for dominance against his Goa'uld, manages to give Sheppard the code he needs and McKay enters it, shutting down the Trust program and reinitializing the failsafes, averting disaster. Hermiod is later able to use the Daedalus' beaming technology to remove the Goa'uld from Caldwell and it is presumably killed afterwards. Caldwell survives the extraction and returns to his position as commander of the Daedalus.

Tau'ri attack on Ba'al's Stronghold
After Teal'c is captured by a Ba'al clone for brainwashing, a rescue is set up after Bra'tac follows the brainwashed Ka'lel to P2M-903 where Ba'al had a Ha'tak parked on a pyramid and was trying to brainwash Teal'c. There, several SG teams including SG-1 and SG-3 battle Ba'al's Jaffa soldiers including a fixed Staff cannon emplacement, backed up by Bra'tac piloting an Al'kesh. Bra'tac's Al'kesh is shot down by Death Gliders and Bra'tac is captured. Lt. Colonel Cameron Mitchell manages to take out the staff cannon with a grenade launcher and makes it to the pyramid's Transportation rings. Lt. Colonel Samantha Carter and Dr. Daniel Jackson save Mitchell from some Jaffa and then ring him into the ship while staying behind to defend the position from the Jaffa which were retreating as they were getting overrun by the Tau'ri forces. On board Ba'al's Ha'tak, Teal'c is apparently successfully brainwashed and is brought an injured Bra'tac to execute with a staff weapon to prove it, but Mitchell, after shooting every Jaffa he came across with a Zat'nik'tel, makes it to the room and attacks, taking out the guards while Teal'c who is revealed to have been faking all along, shoots the Ba'al clone three times with the staff weapon, killing him. Realizing someone is still piloting the ship and that it is taking off, Mitchell, Teal'c and Bra'tac quickly make their way to the rings and escape before the ship leaves. On Dakara, a vote establishes a democaracy for the Free Jaffa Nation and Ba'al's brainwashing over the Jaffa High Council members is broken, fully ruining his plan.

Ba'al's takeover of Stargate Command
Ba'al comes to Earth in an Al'kesh and is shot down by an F-16 near Cheyenne Mountain. SG-1 meet Ba'al at the crash site and he tells them that the clones are rebelling. Stargate Command starts to round up the clones to receive the information they believe Ba'al possesses, the location of Merlin's weapon. Several teams including SG-1 collected several Ba'al clones by fighting their way through Jaffa. Finally all the clones are gathered at the SGC but unknown to the SGC the Ba'als brainwashed Agent Malcolm Barrett into breaking procedure giving them the chance to escape and take over the SGC. The clones take control of Level 15, 16 and 17 and take Barrett and Lt. Colonel Samantha Carter hostage. Lt. Colonel Cameron Mitchell, Teal'c and Vala Mal Doran each lead a strike team to provide a distraction so Dr. Bill Lee and MSgt. Sylvester Siler can release Symbiote poison throughout the levels. Meanwhile, Ba'al forced Carter to download the entire database of Gate addresses form the SGC computer in the hopes of finding the planet with Merlin's weapon and not only destroy the Ori but the Ancients as well. After Vala's team is discovered, Lee is forced to release the poison early and the clones have time retreat back to one location and use their locator beacons to penatrate the SGC's jamming signal and beam to a Tel'tak in orbit.

Athena's capture of Vala Mal Doran
During a dinner with Dr. Daniel Jackson at Il Fiore Bianco, Vala Mal Doran is kidnapped by Devon of The Trust. She is brought to a warehouse where Athena had Weaver and Kakalios use a Memory recall device to find the location of the Clava Thessara Infinitas in Qetesh's memories. During a rescue attempt, the device used to stimulate Vala's memory was hit with a Zat'nik'tel and Vala lost her memory. Vala wandered into Sol's Diner and tried to leave without paying the bill but the owner Sal stopped her. She explained that she could not remember anything from before entering his diner and he gave her a job as a waitress. During one of her shifts, she stopped two men from robbing the diner and was taken to the police station to give her statement. Detective Ryan questioned her and she gave him a fake name so he sent out an attempt to identify bullitin. This got the attention of Stargate Command and The Trust. Unfortunately, The Trust was able to get there first and an impostor of Lt. Colonel Samantha Carter took her away. SG-1 showed up at the station shortly after and Lt. Colonel Cameron Mitchell chased the car on a Motorcycle. While in route she was able to cause the car to crash and Mitchell came upon the crash. Mitchell was shot by one of the Trust operatives and Vala stole a man's car and made Mitchell drive to a hotel room. After Vala left the hotel, she was cornered in a warehouse by The Trust but SG-1 was able to find her and Jackson was able to help her regain her memories.

Ba'al's capture of Adria
After SG-1 used the Galaran memory device to implant false memoried into Vala Mal Doran and lure Adria to an unnamed planet, Ba'al stole Adria off them by beaming several battalions of loyal Jaffa to take her away. Ba'al later killed most of his clones and their Jaffa with Symbiote poison to make sure his plan was not ruined by them and their egos. He then implanted Adria with a clone while in the meantime SG-1 beamed aboard to retrieve Adria unknown to them it was actually Ba'al in control. They were successful in reaching Adria/Ba'al by killing several Jaffa and a Ba'al clone. But they soon realized it was not Adria but Ba'al. They devised a plan to swap Ba'al out for a Tok'ra but this plan failed when Ba'al released his symbiote toxin into her system in attempt to kill her so that the Tok'ra could not retrieve the knowledge she possessed. Ba'al was extracted but not soon enough for Adria to take over the Odyssey before she Ascended.

Skirmish on the Alternate Achilles
Ba'al uses the Solar observation outpost on Praxyon to travel back in time to 1939 through the Stargate to change time using a solar flare. The Achilles is an ocean freighter captained by Mitchell (Colonel Cameron Mitchell's grandfather), that is carrying the Alpha Gate from Africa to the United States of America before the outbreak of World War II. At the time it was zig-zaging across the North Atlantic to evade U-boats and was near the North Pole. Ba'al and three Jaffa arrive and the activation of the Stargate vaporizes the Bosun. Ba'al has his Jaffa kill the entire crew of the ship despite their best attempts to escape and fight back and then plants a Naquadah bomb to destroy the Stargate in order to stop the Tau'ri from being able to stop him in the future. The entire crew is killed and Captain Mitchell is mortally wounded by the time that Ba'al and his Jaffa escape through the Stargate leaving behind the activated bomb. The Captain manages to toss the bomb overboard through the hole made by the activation of the Stargate where it detonates harmlessly in the ocean, but he dies at some point later and the Achilles becomes trapped in the ice of the North Pole leaving the US without a Stargate in the future.

Skirmish on Praxyon
Colonel Cameron Mitchell, Dr. Daniel Jackson, Colonel Samantha Carter, the alternate Teal'c and two Jaffa travel to the planet Praxyon through the Stargate recovered by the Russians. Once there, Carter realizes that the facility that they gated into is Ba'al's time machine and that they can use it to set things right. After convincing Teal'c of this, Carter sets to work to find the right solar flare to send them back in time while Mitchell, Jackson, Teal'c and the two Jaffa work together to hold off Qetesh's Jaffa that keep ringing in. Carter finds a solar flare that will send them back to 1929, ten years too soon, but they decide that it will have to be close enough. Jackson and the two Jaffa are killed in the battle and Carter is killed as she finishes dialing the Stargate. Mitchell escapes through the Stargate into the past, but Teal'c is mortally wounded by the remaining Jaffa and remains behind. Qetesh rings in and offers Teal'c to become her First Prime, but as his last act before dying, he detonates a grenade that kills him, Qetesh and the enemy Jaffa and destroys the time machine.

Skirmish on the Achilles
In order to change the timeline, the real Ba'al travels back in time to destroy the Achilles and the Alpha Gate before it can reach the United States of America. But Colonel Cameron Mitchell managed to travel back in time from the altered future caused by this to 1929 and after waiting for ten years, he somehow manages to stow aboard the Achilles and is prepared to stop Ba'al. When Bosun comes to check out the cargo due to the Stargate causing vibrations, he runs into Mitchell who he mistakes for the Captain Mitchell who is Cameron's grandfather. Mitchell hands him a Thompson submachine gun and orders him to one side of the Gate so he won't be vaporized by its activation like he was in the alternate timeline. The first two Jaffa come through the Stargate and are immediately killed by Mitchell and the Bosun. Ba'al comes through next and is shocked to see Mitchell who shoots him in the head, finally killing him. The last Jaffa arrives carrying the Naquadah bomb and is killed by the Bosun, putting history back on track as Ba'al and his men are now never able to stop the Achilles from reaching the United States with the Stargate.