A misfit archaeologist joins a military team in travelling through an ancient doorway to a far-away planet, where they must liberate an enslaved people from a powerful false god.
SG-1 travels to the Ori home galaxy in search of an Ancient device that could stop the Ori war once and for all. But the return of an old enemy threatens to overrun the ship before they can accomplish their mission.
After Teal'c and Vala vanish during Baal's execution ceremony, the team gates back to Earth to discover that the timeline has been altered and the Stargate program no longer exists.
