A charismatic Jaffa leader seeks to forge an alliance between Earth and his rebel followers, winning the allegiance of Teal'c and Bra'tac.

Jack and Mason investigate the area where the power was to be turned off. Nina tries to warn Jack about his family's disappearance, but Mason hampers her efforts. Teri explores…

Earth finds itself threatened by something even larger than the Goa'uld when the team learns that an asteroid is on a collision course with the planet.

Palmer and Sherry clash over the handling of the evidence against Carl. Kim finds herself in a sticky situation with Dan's brother. Jack poses as Alexis and meets with a…

Dr. Jackson's undercover mission to a Goa'uld summit is complicated by the arrival of a surprise guest. The rest of the team face a full-scale invasion of the Tok'ra homeworld.

Teri is struck with amnesia and must turn to an old friend for help. Kim goes to Rick's house in hopes of finding a lead. Jack sets Elizabeth up for…

The Tok'ra war with the Goa'uld escalates, and the rebel faction sends Daniel Jackson to a secret meeting between the System Lords.

Keith takes matters into his own hands when he arranges a secret meeting with Carl. Elizabeth realizes who Alexis really is and immediately comes forward. Jack and Mason question her…

Disaster strikes the Stargate, trapping Teal'c in transit. SG-1 must turn to Russia — and to their enemies — for help.

Jack and Palmer finally meet face to face and learn of their connection through Operation Nightfall. They work together to track down those who are seeking revenge on them. A…