An experiment gone wrong pulls Samantha Carter into a parallel reality, where she must save Earth from an Ori assault before she will be allowed to return home.
SG-1 tries to defend a planet from the Ori by hiding its people in another dimension. Vala attempts to convince her husband Tomin of the Ori’s true motives.
When the team finds Merlin himself, they must help him complete the Sangraal weapon before Adria and her Ori forces can track them down.
SG-1 races against Baal in the hunt to find the Sangraal, Merlin’s anti-Ori weapon, and comes up against a series of ancient trials.
Cameron Mitchell must go undercover inside the deadly Lucian Alliance to prevent his teammates from becoming casualties of an Alliance civil war.
Striken with amnesia and on the run, Vala takes a job as a waitress as she tries to piece together who she is and what happened to her.
The Jaffa take the fight to the Ori, using a genocidal weapon on their new worshipers and landing SG-1 in the middle of a war they can’t control.
Martin Lloyd seeks out SG-1 for assistance when his failed TV show based on the real Stargate program becomes a feature film.
Teal’c discovers a world where people are being savagely attacked by an elusive creature, leading SG-1 to a stunning discovery about its potential origin.
When Baal comes to Earth seeking help, Stargate Command must capture his clones and determine which one is the genuine article.