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.

SG-1 must free an alternate reality Earth from a Goa'uld invasion after duplicates of Samantha Carter and Charles Kawalsky come through the quantum mirror.

O'Neill steals technology from the Tollan, and is forced to leave the Stargate program. Maybourne offers an intriguing proposal.

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

The Asgard aid Earth in negotiating a nonagression treaty with the Goa'uld System Lords.

The Tollan put Skaara and Klorel on trial to determine who will control the host body.

SG-1 must escape a hellish prison moon, and one of their worst enemies.

After a meteor strike buries the Stargate, O'Neill finds himself stranded on a planet with no hope of rescue.

An alien artifact causes Daniel to disappear, and the team looks for help from his institutionalized grandfather.

O'Neill, Carter and Jackson must escape Hathor's clutches, while Teal'c tries to raise a Jaffa army on Chulak. General Hammond must take desperate measures to rescue the team.

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.

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.

SG-1 discovers a planet where children are used to acquire knowledge for the entire population, then discarded.

SG-1 is taken captive by an alien bounty hunter with uncertain loyalties.

SG-1 encounters an entire planet suffering from amnesia. The planet's leader returns to Earth with SG-1 to find a cure, but SG-1 suspects she may not be who she appears to be.

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

The members of SG-1 are imprisoned on a planet and become pawns in a war of ideology.

When Daniel goes insane, SG-1 must deal with the legacy of Machello's anti-Goa'uld technology.

Jackson deals with the apparent death of his wife, Sha're, at the hands of Teal'c.

SG-1 must find a renegade Goa'uld who has been hiding on Earth for thousands of years.

SG-1 discovers a military camp where young men are trained to impersonate SGC personnel to infiltrate Earth.

SG-1 finds a medieval Christian society terrorized by Sokar and the Unas, and is accused of being possessed by demons.