22 episodesFirst aired 25 June 1999
SG-1 in their fight against the Goa'uld Empire's System Lords, the main being Sokar until "The Devil You Know" and then Apophis, after he regained power during that episode.
E1Jun 199944m
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.
E2Jul 199944m
SG-1 must find a renegade Goa'uld who has been hiding on Earth for thousands of years.
E3Jul 199944m
The Asgard aid Earth in negotiating a nonagression treaty with the Goa'uld System Lords.
E4Jul 199944m
When Daniel goes insane, SG-1 must deal with the legacy of Machello's anti-Goa'uld technology.
E5Jul 199944m
SG-1 discovers a planet where children are used to acquire knowledge for the entire population, then discarded.
E6Jul 199944m
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.
E7Aug 199944m
SG-1 is taken captive by an alien bounty hunter with uncertain loyalties.
E8Aug 199944m
SG-1 finds a medieval Christian society terrorized by Sokar and the Unas, and is accused of being possessed by demons.
E9Aug 199944m
SG-1 discovers a military camp where young men are trained to impersonate SGC personnel to infiltrate Earth.
E10Oct 199944m
Jackson deals with the apparent death of his wife, Sha're, at the hands of Teal'c.
E11Oct 199944m
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.
E12Oct 199944m
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.
E13Oct 199944m
SG-1 must escape a hellish prison moon, and one of their worst enemies.
E14Nov 199944m
SG-1 returns from a mission and discovers that metamorphic aliens have taken over the complex.
E15Jan 200044m
The Tollan put Skaara and Klorel on trial to determine who will control the host body.
E16Jan 200044m
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.
E17Feb 200044m
After a meteor strike buries the Stargate, O'Neill finds himself stranded on a planet with no hope of rescue.
E18Feb 200044m
O'Neill steals technology from the Tollan, and is forced to leave the Stargate program. Maybourne offers an intriguing proposal.
E19Feb 200044m
The members of SG-1 are imprisoned on a planet and become pawns in a war of ideology.
E20Feb 200044m
SG-1 discovers the mystical planet Kheb, and must find the Harcesis child of Apophis and Sha're before Apophis's army does.
E21Mar 200044m
An alien artifact causes Daniel to disappear, and the team looks for help from his institutionalized grandfather.
E22Mar 200044m
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.