||SG-1 finds themselves stranded in a crippled ship in a distant galaxy -- with Apophis threatening to destroy them. Teal`c is brainwashed and made loyal to Apophis once again.
||SG-1 encounters a potential new, technologically advanced ally in the war against the Goa`uld -- though they do not know the Aschen`s dark secret.
||Major Carter is kidnapped by a terminally ill man who intends to use a Goa`uld symbiote to save his life. O`Neill is forced to team up with an old foe to find her.
||An alien ship approaches Earth, sending SG-1 to an old friend for some answers -- where they discover that Martin Lloyd has created a TV show about the Stargate program.
||While training cadets at a secret facility, O`Neill learns of a possible alien incursion at the SGC -- and must take a group of raw cadets into a real battle situation.
||The Tok`ra war with the Goa`uld escalates, and the rebel faction sends Daniel Jackson to a secret meeting between the System Lords. The Goa`uld invade the Tok`ra homeworld.
||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.
||Earth finds itself threatened by something even larger than the Gou`ald when the team learns that an asteroid is on a collision course with the planet.
||SG-1 encounters a young woman with the ability to control Replicators, and who may hold the key to the salvation of the Asgard.
||Daniel Jackson is exposed to a lethal dose of radiation while visiting an alien civilization that is building a weapon of mass destruction.
||SG-1 must come to the rescue of their once-powerful allies when the Goa`uld attack a secret Asgard laboratory.