O'Neill, Carter and Jackson are trapped on Hathor's planet. Teal'c and Hammond go to Chulak to forge a rescue plan and recover the team.

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Jacob visits Earth saying the Tok'Ra believe that the Goa'uld Seth is hiding on Earth. Jackson's research indicates that Seth is passing as a religious cult leader. SG-1 attempts to capture or kill him without falling under his control.

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The Asgard and three Goa'uld System Lords meet at Stargate Command to negotiate a treaty modification, but subterfuge and treachery threaten not only the success of the negotiations, but Earth itself.

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When the SG-1 team discover a sealed chamber of dead Goa'ulds, Daniel Jackson is exposed to the parasites that killed them and threaten to drive him insane.

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While employing the help of a planet's highly intelligent children for a project, the team discovers their horrific imposed fate when they reach a certain age.

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Alternate reality versions of Kawalsky and Carter are caught at Area 51 after coming through the quantum mirror.

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SG-1 is captured by a bounty hunter who uses them to help catch a Tok'ra named Korra. The Goa'uld has his race addicted to a drug that can be supplied only by them, but he repents at the last moment and asks Sam to help free his race from the drug.

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SG-1 visits a planet ruled by a Goa'uld-infested Unas, who uses the persona of the Devil to keep the residents ruled by fear. They free the people of the "devil" and instruct them to bury the stargate.

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SG-1 come across another SG team being attacked by Jaffa. They offer to help but are shot by the SG team members. When they awake, they find out that the other SG team are Jaffa, loyal to Apophis, who are planning to infiltrate Earth.

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Whilst rescuing Kasuf's Abydonians, the Goa'uld queen Amaunet inside Dr. Jackson's long lost wife Sha're tries to kill him, but Teal'c shoots her fatally. Grief stricken, Daniel resigns from the SGC and gets strange appearances by Sha're, telling him to forgive Teal'c and about her special child.

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The team discovers an early industrial world with suffering from collective amnesia and has no elderly people.

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When Major Carter's father Jacob is kidnapped by Sokar, the SG-1 team must infiltrate a prison moon designed to look like hell to rescue him.

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Imprisoned on a hellish moon controlled by Sokar, SG-1 and Martouf are subjected to torture by one of their worst enemies.

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SG-1 returns from a mission and discovers that metamorphic aliens have taken over the complex.

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The SG-1 team is requested by the Tollan to participate in a trial concerning Skaara and whether he has control of his body or the Goa'uld parasite, Klorel.

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SG-1 receives alien brain implants that manifest themselves as a bizarre man, who tells them that they would not survive the procedure to remove him.

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After a cataclysmic meteorite bombardment, Col. Jack O'Neill finds himself stranded on a primitive planet with its Stargate apparently permanently inaccessible.

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Col. O'Neill is dismissed from the SGC for stealing alien technology, and is subsequently approached to participate in an even more covert Stargate operation.

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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.

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SG-1 discovers the mystical planet Kheb, and must find the Harcesis child of Apophis and Sha're before Apophis's army does.

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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.

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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.

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