Stargate Command begins to explore the galaxy, making many new friends -- and new enemies.

The team encounters a Goa'uld resistance movement and forms an alliance with the Tok'ra.

Earth signs a treaty with the Goa'uld to prevent invasion, but the galaxy faces a new threat from Sokar.

Earth joins the fight against the Asgard's unstoppable enemy, and SG-1 discovers that the Russians have started a Stargate program.

A powerful new Goa'uld enemy threatens to annihilate Earth and its allies, while the System Lords renew their alliance.

Jonas Quinn joins SG-1, and the team faces the new threat of Anubis. The Asgard's conflict with the Replicators comes to a head.

Daniel Jackson rejoins the team, which must find the Lost City of the Ancients to stop a terrible enemy.

Jack O'Neill takes command of the S.G.C., while old enemies prove they can't be written off so easily.

A new member joins the team, and SG-1 and Stargate Command are forever changed. A powerful new enemy from a distant galaxy targets the Milky Way Galaxy with demands for total submission.

The Milky Way Galaxy stands on the brink of destruction as the Ori worshipers invade, led by the half-Ori Adria, and Vala Mal Doran joins SG-1 to try and help stop them.