A teenage boy shows up at the S.G.C. claiming to be Jack O’Neill, sending the team on a mission to uncover his true identity.

Jackson’s teammates notice a disturbing change in him when he is reunited with the Harcesis child and given the Goa’uld genetic memory.

Dr. Jackson is taken captive by an Unas while on an archaeological dig. The SGC mounts a rescue operation, but discovers a danger of their own.

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

The members of SG-1 are used as forced labor in an underground alien facility after their memories are erased by the ruling elite.

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.

A test gone wrong leaves Jack and Teal’c marooned in space aboard a damaged prototype attack ship

An alien ship approaches Earth, sending SG-1 to an old friend for some answers — where they discover that Martin Lloyd has created a TV show about the Stargate program.

Cassandra mysteriously falls ill, sending SG-1 back to her home planet — where they uncover a dark Goa’uld secret.

A warring alien race offers to exchange their advanced technology for Earth’s help in defeating their enemy.

A Tok’ra archaeologist arrives at the SGC with newly discovered technology, giving the SG-1 team superhuman powers.

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.

Teal’c is reunited with his lost love — a woman who claims to have found a way to communicate with her symbiote and defeat the Goa’uld.

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.

O’Neill and Teal’c are caught in a time loop in the SGC, and must relive the same 10 hours over and over again.

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.

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

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.

Apophis, SG-1’s greatest enemy, seeks sanctuary from Sokar and ends up near death in the S.G.C. infirmary.

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

A young boy arrives through the Stargate, and warns of plot by invisible aliens to kill all of the human race in order to rob the Goa’uld of potential hosts.

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

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