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.
An alien artifact causes Daniel to disappear, and the team looks for help from his institutionalized grandfather.
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.
O'Neill steals technology from the Tollan, and is forced to leave the Stargate program. Maybourne offers an intriguing proposal.
After a meteor strike buries the Stargate, O'Neill finds himself stranded on a planet with no hope of rescue.
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.
The Tollan put Skaara and Klorel on trial to determine who will control the host body.
SG-1 returns from a mission and discovers that metamorphic aliens have taken over the complex.
SG-1 must escape a hellish prison moon, and one of their worst enemies.
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 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.
Jackson deals with the apparent death of his wife, Sha're, at the hands of Teal'c.
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.
SG-1 is taken captive by an alien bounty hunter with uncertain loyalties.
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.
SG-1 discovers a planet where children are used to acquire knowledge for the entire population, then discarded.
When Daniel goes insane, SG-1 must deal with the legacy of Machello's anti-Goa'uld technology.
The Asgard aid Earth in negotiating a nonagression treaty with the Goa'uld System Lords.
SG-1 must find a renegade Goa'uld who has been hiding on Earth for thousands of years.
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.
