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Mitchell attempts to infiltrate the Lucian Alliance in order to rescue members of the SG-1 team from the fallout of an Alliance civil war.
Vala finds herself alone in a city with no memory of her identity or past life. Meanwhile, Mitchell and Teal'c question a man named Weaver who may have information about Vala's whereabouts.
The SG-1 team continues their quest for the Holy Grail, an Ancient device capable of killing the ascended Ori. They learn that an old nemesis is also looking for the device.