The people of a world that had succumbed to the religion of Origin were all mysteriously wiped out by an unknown force. As SG-1 investigated, they discovered that the Dakara superweapon was responsible and decided to investigate further, only for things to take a turn for the worse when they met a group of Jaffa who have plans for commandeering an Ori warship and matters are further complicated when Adria returns, hellbent on finding out who or what killed her new followers. (SG1: "Counterstrike")
After another planet had fallen into the hand of the Ori, the Jaffa leader Se'tak uses the Dakara superweapon to annihilate the surrounding Ori forces, notably an Ori warship. Unfortunately, all life on the planet was killed in the process. SG-1, who were on the planet earlier, discovered the mothership and decided they could not pass the opportunity to examine an unmanned and completely accessible Ori ship. Unfortunately, they were not the only ones with the idea to explore the vessel, a group of Jaffa led by a man named Bo'rel was also aboard. Bo'rel, who wanted the ship under Jaffa control, captured Teal'c and Lt. Colonel Cameron Mitchell. Afterwards, three Ha'taks dropped out of hyperspace in orbit and Odyssey, which they brought earlier, left to prevent a possible confrontation. Bor'el, having heard Mitchell talking to Lt. Colonel Samantha Carter over their radios, called to the rest of SG-1 to surrender or he would harm Teal'c and Mitchell. Dr. Daniel Jackson suggested that the Tau'ri and Jaffa work together. However Bor'el refused, and while Daniel continued to try and reason with Bo'rel, he and Vala Mal Doran were at that moment captured by a Jaffa patrol.
Adria, who had apparently survived the attack, appeared and captured Daniel and Vala by killing the Jaffa with her powers. Daniel tried to stun her with a Zat'nik'tel, but she began to telekinetically choke Daniel demanding that they told her what happened. Despite her best efforts, she could not force the information from Daniel's mind. Daniel and Vala tried to reason with Adria. With help from Carter, who had returned from the bridge, Mitchell and Teal'c escaped from the Jaffa and decided to head for the Stargate. Adria brought a Jaffa back to life and forced the soldier to reveal the location of the superweapon. She then activated and operated the Ori Battlecruiser and set course for Dakara. Carter, Mitchell and Teal'c go to the bridge and try to override the primary systems. They encounter Bo'rel and convinces him that they have to fight a common enemy. The ship arrived at Dakara and Mitchell decided to destroy the powercore using C-4. Unfortunately Adria had prevented the C-4 from detonating. The Jaffa attack the room she was holding Daniel and Vala prisoner in, but she sealed the door.
The Odyssey arrived, but was unable to extract SG-1, Carter succeeded in deactivate the shielding and SG-1 were beamed off. The Odyssey jumped to hyperspace to avoid the wavefront of the superweapon which the Jaffa had deployed in a last ditch effort against the battlecruiser. The desperate defense strategy succeeded, only in killing the Jaffa aboard the ship, since Adria is immune to the superweapon. Eager to destroy the only real threat to the Ori, Adria fired the battlecruiser's beam weapon directly at the superweapon. The Superweapon was completely destroyed. Back at Stargate Command, SG-1 received word that not only had Dakara been devastated, but five more planets had fallen to the Ori. With the Dakara superweapon destroyed, three Jaffa Ha'taks destroyed and the Ori continuing to convert countless planets, Merlin's anti-Ori weapon is now needed more than ever. (SG1: "Counterstrike")
Back at the SGC, SG-1 received word that not only had Dakara been devastated but five more planets have fallen to the Ori and the Free Jaffa Nation was thrown into disarray. With the Dakara superweapon destroyed and the Ori continuing to convert countless planets, Merlin's anti-Ori weapon was now needed more than ever. (SG1: "Counterstrike")
This also affected System Lord Ba'al plan for use of the weapon to regain his formal power base, forcing them to also seek out the anti-Ori device to defeat the Ori. (SG1: "The Quest, Part 1", "The Quest, Part 2")