Ba'al travels back in time and prevents the Stargate program from being started. SG-1 must figure out how to restore history.

The Stargate is an intergalactic gateway, developed by an ancient civilization, that links other planets from other solar systems to ours. The U.S. Air Force assembles a Stargate team for interstellar peace-keeping missions.

Adventures of a U.S. Air Force interstellar peacekeeping team assigned to an ancient intergalactic gateway, the Stargate, which links planets from various solar systems.

Adventures of a U.S. Air Force interstellar peacekeeping team assigned to an ancient intergalactic gateway, the Stargate, which links planets from various solar systems.

Adventures of a U.S. Air Force interstellar peacekeeping team assigned to an ancient intergalactic gateway, the Stargate, which links planets from various solar systems.

Adventures of a U.S. Air Force interstellar peacekeeping team assigned to an ancient intergalactic gateway, the Stargate, which links planets from various solar systems.

Stargate is an intergalactic gateway, developed by an ancient civilization, that links planets from other solar systems to ours. The US Air Force assembles a Stargate team headed by Colonel Jack O'Neill (Richard Dean Anderson) for interstellar peacekeeping. In "The serpent's lair," the SG-1 team boards an enemy ship with enough explosives to destroy the entire force, but the team's capture turns their objective into a suicide mission. In "In the...

The Stargate is an intergalactic gateway, developed by an ancient civilization, that links other planets from other solar systems to ours. The U.S. Air Force assembles a Stargate team headed by Colonel Jack O'Neill for interstellar peacekeeping missions.

In the final season, Vala, a former Goa'uld host turned freedom figther, joins SG-1in their battle to defend the galaxy from the holy war of Ori. Meanwhile, relations between Jaffa and Earth continue to be strained.