The third season of Stargate: Atlantis was a time of change for the series. The cast experienced several changes in the latter part of the season, and the individual episodes focused more in this season on character development.


Image Title Number Airdate Planet(s) Race(s) Enemies
Battle of the Void "No Man's Land (Part 2 of 3)" 301 July 14, 2006 Earth, Lantea Asgard, Human-form Wraith, Wraith Wraith Queen
Two Wraith Hive Ships used the alliance to upgrade their hyperdrives to reach Earth. While the Daedalus and the Orion are sent to dispatch them, Dr. Rodney McKay and Ronon Dex escape from their cocoons, and Lt. Colonel John Sheppard uses his F-302 fighter-interceptor to attach himself on one of the ships to ambush them.
Misbegotten "Misbegotten (Part 3 of 3)" 302 July 21, 2006 Earth, Lantea, M8G-352 Human-form Wraith, Wraith Michael Kenmore
The Atlantis expedition stopped the Wraith from reaching Earth, and now that they turned Human, they send them to an isolated world to teach them to administer the Iratus bug retrovirus themselves. However, some of them, including Michael Kenmore, are starting to remember their past.
Irresistible "Irresistible" 303 July 28, 2006 Lantea, Lucius' planet Lucius' people N/A
The Atlantis expedition encounter Lucius Lavin, a highly obnoxious man, but everyone in his village seems to love him. After visiting Atlantis, Dr. Rodney McKay and Lt. Colonel John Sheppard notice that everyone in the city is starting to fall for him, and it is up to them to figure out why.
Sateda (episode) "Sateda" 304 August 4, 2006 Keturah's planet, Lantea, Sateda Keturah's people, Satedan, Wraith Wraith Leader
Ronon Dex is noticed by the villagers he once visited during his time as a runner. After getting turned in by the villagers to the Wraith, he is implanted with another Wraith tracker and dropped off on his abandoned homeworld, Sateda, where he is forced to become a runner again.
Progeny "Progeny (Part 1 of 2)" 305 August 11, 2006 Asuras, Lantea Ancient, Asuran Oberoth
The Atlantis expedition makes first contact with the Asurans, who claim that they are the last of the Ancients. However, after holding the team prisoner, they learn that they are not people, but machines; Replicators, and they plan to destroy Atlantis.
The Real World "The Real World (Part 2 of 2)" 306 August 18, 2006 Lantea Asuran N/A
Dr. Elizabeth Weir awakens in a psychiatric hospital outside Washington D.C. where she is told that she never left Earth, and the entire Stargate Program, and Atlantis never existed.
Common Ground 11 "Common Ground" 307 August 25, 2006 Kolya's planet, Lantea, Unnamed, Unnamed, Unnamed Genii, Wraith Acastus Kolya
Lt. Colonel John Sheppard is captured by Commander Acastus Kolya, who wants the expedition to hand over Ladon Radim, in exchange of returning Sheppard. Sheppard is also imprisoned with a Wraith feeding on him, and the two form an unlikely alliance to escape the base.
McKay and Mrs. Miller "McKay and Mrs. Miller" 308 September 8, 2006 Earth, Lantea Asgard N/A
Jeannie Miller, Dr. Rodney McKay's sister has thought up a theory to bridge two realities together. Stargate Command, and McKay convince her to come to Atlantis to reform Project Arcturus. However, soon, another McKay appears in front of everyone's eyes.
Phantoms "Phantoms" 309 September 15, 2006 Lantea, M1B-129 Genii, Wraith N/A
Lt. Colonel John Sheppard's team travels to M1B-129 to retrieve a missing team, but come across a Wraith Mind manipulator, making the team see things things that aren't there.
The Return, Part 1 "The Return (Part 1 of 2)" 310 September 22, 2006 Earth, Lantea, New Athos Ancient, Asuran, Genii Cetus, Talus
While testing the McKay/Carter Intergalactic Gate Bridge, the Daedalus picks up an Ancient warship, the Tria, who retake control of Atlantis, and the expedition is expelled to Earth. However, the Asurans are heading straight for Atlantis.
The Return, Part 2 "The Return (Part 2 of 2)" 311 November 20, 2006 Earth, Lantea, New Athos Asuran Cetus, Talus
Lt. Colonel John Sheppard's team reunites to take out the Asurans, who have taken control of Atlantis, and plan to use Niam, who is drifting in space over Lantea. Meanwhile, Major General Jack O'Neill and Richard Woolsey do their best to avoid capture.
Coronal mass ejection "Echoes" 312 November 27, 2006 Lantea Ancient, Flagisallus N/A
Teyla Emmagan starts seeing "ghosts" of Ancients wandering Atlantis, and soon other people start seeing them also. The visit from a group of Flagisallus are related, when they use the "ghosts" to warn the expedition of a Coronal mass ejection.
Irresponsible "Irresponsible" 313 December 4, 2006 Lantea, M65-PL8 People of M65-PL8, Genii, Lucius' people Acastus Kolya
Lt. Colonel John Sheppard's team travels to a planet to meet a "hero", only to find Lucius Lavin, who play-fights off Genii mercenaries to win the hearts of the villagers. However, the mercenaries soon contact Commander Acastus Kolya in order to capture Sheppard's team.
Tao of Rodney "Tao of Rodney" 314 December 11, 2006 Lantea N/A N/A
Dr. Rodney McKay gets "zapped" by a device, where his brain quickly evolves to that of the Ancients to achieve Ascension, and he gains super powers. However, he must learn to ascend, or he will die, but it isn't going to be easy.
The Game "The Game" 315 December 18, 2006 Lantea, M4D-058 Geldaran, Hallonan N/A
Major Evan Lorne reports back from M4D-058 and tells them they encountered a race of humans who has Dr. Rodney McKay's face on their flag. They learn that a game McKay and Lt. Colonel John Sheppard were playing is actually happening in reality. However, this also causes friction between McKay and Sheppard's worlds, who are on the brink of war.
The Ark "The Ark" 316 January 8, 2007 Jamus' homeworld, Lantea Jamus' people Jamus
Lt. Colonel John Sheppard's team discovers a moon base where the last of a race of Humans remain. They soon discover, however, the entire population is in danger when the station is damaged through the suicide of a recently awoken resident.
Sunday "Sunday" 317 January 15, 2007 Lantea N/A N/A
While the Atlantis expedition tries and relax on a regular Sunday, a mysterious explosion rocks the city, leaving three people dead. It is later revealed that a scientist is a walking time-bomb, and has to be stopped. However, the attempt to resolve the problem will result in the loss of an important figure in Atlantis.
Drilling platform "Submersion" 318 January 22, 2007 Lantea Wraith Wraith Queen
The Atlantis expedition explore a Mobile drilling platform under the ocean of Lantea. However, due to Teyla Emmagan's background, a Wraith Queen awakens after being stuck in a nearby crashed cruiser for 10,000 years.
Vengeance "Vengeance" 319 January 29, 2007 Lantea, Taranian settlement Bug People, Human-Wraith Hybrid, Taranian Michael Kenmore
The Taranians have failed to contact Atlantis, so Lt. Colonel John Sheppard's team is sent to investigate. They find the settlement abandoned, and soon find them all dead, by Michael Kenmore's experimenting.
First Strike "First Strike (Part 1 of 3)" 320 February 5, 2007 Asuras, Lantea Asuran Oberoth
The new Earth battle-cruiser Apollo arrives in Atlantis to launch a preemptive strike against an armada of Asuran ships preparing to take off to Earth. However, after the strike is finished, a weapons satellite appears above the city and attacks its shields. If they cannot find away out of the situation, Atlantis will be no more.


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