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 must stop Apophis and Heru-ur from forming an alliance of their powerful forces, while Teal'c is captured and tortured by the Goa'uld.

The SGC is invaded by an alien life force that takes up residence in the base computer system -- and in Major Carter.

SG-1 discovers a civilization that uses Unas as slave labor, and attempt to liberate Daniel's friend, Chaka.

A charismatic Jaffa leader seeks to forge an alliance between Earth and his rebel followers, winning the allegiance of Teal'c and Bra'tac.

SG-1 encounters a young woman with the ability to control Replicators, and who may hold the key to the salvation of the Asgard.

Tensions rise between the Tok'ra and rebel Jaffa at the S.G.C.'s offworld base when they are attacked by an invisible enemy.

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.

After an injury, Teal'c must put aside his self-doubt when SG-1 launches a mission to rescue his son and his mentor from a Jaffa death camp.

When Earth's attempts to exploit a newly-discovered naquadah mine are thwarted by a tribe of indigenous Unas, SG-1 must turn to an old friend for help.

O'Neill seeks help from a former comrade to rescue Daniel and Dr. Lee, who have been kidnapped in Central America. Carter, Teal'c and Jacob infiltrate Anubis' super-soldier facility.

Earth's secret offworld base is attacked by Anubis' forces, and Major Carter finds herself being hunted by the enemy. General Hammond and Jacob Carter make an unnerving discovery about the Earth-Tok'ra alliance.

Teal'c becomes the chief suspect in a murder investigation after he moves into an apartment off-base. Carter considers her future with Pete.

A duplicate of Colonel Carter seeks help from Stargate Command in defeating the Replicator Fifth, who she claims has found a way to counter the Asgard's new weapon.

SG-1 comes to the aid of a world about to be invaded by the Goa'uld, only to discover that the local king is Earth's Harry Maybourne.