The U.S. government creates Stargate Command to explore the galaxy and acquire advanced technologies to defend Earth. SG-1 makes many new friends -- and new enemies.

The team encounters a Goa'uld resistance movement and forms an alliance with the Tok'ra. Captain Carter's life is forever transformed, and the team witnesses the fall of a powerful enemy.

Earth signs a treaty with the Goa'uld to prevent invasion, but SG-1 continues to encounter deadly enemies -- including Sokar, a powerful rogue Goa'uld poised to conquer the galaxy.

Earth joins the fight against the Asgard's seemingly unstoppable enemy, and SG-1 discovers that the Russians have started a Stargate program. The team's arch enemy becomes more powerful than ever before.

A powerful new Goa'uld enemy threatens to annihilate Earth and its allies. The System Lords renew their alliance, and one member of the team begins a new journey.

Jonas Quinn joins SG-1, and the team faces a powerful new Goa'uld threat. Colonel O'Neill is forever altered, and the Asgard's conflict with the Replicators comes to a head.

Daniel Jackson rejoins the team after an incredible experience, as the team must find the Lost City of the Ancients to defeat a terrible enemy.

Change is in the air at the S.G.C., as Jack O'Neill steps into the big shoes following General Hammond's reassignment. Old enemies prove they can't be written off so easily.

Neither SG-1 nor Stargate Command will ever be the same when a new member joins the team, and a new commanding officer is assigned. An amazing new enemy reveals itself to Earth.

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