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ENEMIES 501 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. This episode is part two of two, following "Exodus"

THRESHOLD 502 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.

ASCENSION 503 An alien being is smitten with Carter and follows her back to Earth, assuming human form and pursuing a relationship with her.

THE FIFTH MAN 504 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.

BEAST OF BURDEN 507 SG-1 discovers a civilization that uses Unas as slave labor, and attempt to liberate Daniel's friend, Chaka.

THE TOMB 508 SG-1 teams with a Russian unit when one of their Stargate teams goes missing in a mysterious alien ziggurat.

2001 510 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.

PROVING GROUND 513 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 SGC.

48 HOURS 514 Disaster strikes the Stargate, trapping Teal'c in transit. SG-1 must turn to Russia -- and to their enemies -- for help.

SUMMIT 515 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. This episode is part one of two, followed by "Last Stand"

LAST STAND 516 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. This episode is part two of two, following "Summit"

FAIL SAFE 517 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.

THE WARRIOR 518 A charismatic Jaffa leader seeks to forge an alliance between Earth and his rebel followers, winning the allegiance of Teal'c and Bra'tac.

MENACE 519 SG-1 encounters a young woman with the ability to control Replicators, and who may hold the key to the salvation of the Asgard.

THE SENTINEL 520 SG-1 must turn to a pair of convicted criminals to save a world from annihilation by the Goa'uld.

MERIDIAN 521 Daniel Jackson is exposed to a lethal dose of radiation while visiting an alien civilization that is building a weapon of mass destruction.

REVELATIONS 522 SG-1 must come to the rescue of their once-powerful allies when the Goa'uld attack a secret Asgard laboratory.