O'Neill, Carter and Jackson must escape Hathor's clutches, while Teal'c tries to raise a Jaffa army on Chulak. General Hammond must take desperate measures to rescue the team.
SG-1 must free an alternate reality Earth from a Goa'uld invasion after duplicates of Samantha Carter and Charles Kawalsky come through the quantum mirror.
The Tollan put Skaara and Klorel on trial to determine who will control the host body, calling on SG-1 to defend their friend's claim against the Goa'uld.
O'Neill steals technology from the Tollan, and is forced to leave the Stargate program. Maybourne offers an intriguing proposal involving his black-ops team.
Jack, Sam and Daniel are imprisoned on a planet and become pawns in a war of ideology, while Teal'c must rely on the kindness of a local man after being badly injured.
An alien artifact causes Daniel to disappear, and the team looks for help from his institutionalized grandfather – unaware that their friend is still close by.
SG-1 faces creatures of mass destruction that even the Asgard can't control, and must destroy Thor's infested vessel before the Replicator bugs reach Earth.