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.

His mind altered by Apophis, Teal'c must undergo a ritual that takes him to the edge of death itself, in order for him to rediscover who he is.

An alien being is smitten with Carter and follows her back to Earth, assuming human form and pursuing a relationship with her.

O'Neill and Lieutenant Tyler are ambushed by Goa'uld forces and trapped behind enemy lines while the rest of their team discover they don't know who Tyler is.

SG-1 discovers that their trip through the Stargate may have inadvertently doomed an entire civilization, and plead with the Asgard for assistance.

Cassandra mysteriously falls ill, sending SG-1 back to her home planet where they uncover a dark Goa'uld secret.

SG-1 discovers a civilization that uses Unas as slave labor, and attempt to liberate Daniel's friend, Chaka.

SG-1 teams with a Russian unit when one of their Stargate teams goes missing in a mysterious alien ziggurat.

The Tollan offer Earth advanced weapons technology, prompting a secret investigation on Tollana one that leads to a startling discovery.

SG-1 encounters a potential new, technologically advanced ally in the war against the Goa'uld though they do not know the dark secret of the Aschen.

When 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.

This is the 100th episode.

SG-1 trains a team of raw cadets, and Colonel O'Neill is forced to take them into a real-life battle situation when he learns of a possible alien incursion at the S.G.C.

After an accident with the Stargate traps Teal'c in transit, SG-1 must turn to Russia and to their enemies for help before time runs out.

The Tok'ra send Daniel Jackson to a secret meeting between the System Lords, unaware that a new power is about to attack the Tok'ra homeworld.

Dr. Jackson's undercover mission to a Goa'uld summit is complicated by the arrival of a surprise guest. Meanwhile, the rest of the team is buried under the surface of the Tok'ra homeworld after a Goa'uld attack.

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.

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

SG-1 encounters a young woman with the ability to control Replicators, and who may hold the key to the salvation of the Asgard.

SG-1 must turn to a pair of convicted criminals to save a world from annihilation by the Goa'uld.

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.