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Daniel and Vala travel to Atlantis in search of Merlin's anti-Ori weapon, while Sam and Mitchell join forces with Dr. McKay to lock out the Ori supergate.
The team goes off-world seeking a weapon against the Ori and ends up in serious trouble. Meanwhile, Landry is faced with having to decide whether or not Vala can be trusted to remain at the SGC.
Stargate Command faces off against their old nemesis Ba'al and his clones as Landry spars with the NID and Agent Barrett.