The first of two films after the closing of the series StarGate SG-1, the closing of the Ori storyline and tells about the finding of the Ark of the truth.

SG-1 searches for an ancient weapon which could help them defeat the Ori, and discover it may be in the Ori's own home galaxy. As the Ori prepare to send ships through to the Milky Way to attack Earth, SG-1 travels to the Ori galaxy aboard the Odyssey. The International Oversight committee has their own plans and SG-1 finds themselves in a distant galaxy fighting two powerful enemies.

When the Stargate team goes to see Ba al, the last of the System Lords, being extracted from his host. All of a sudden, Tealc, Vala and all of their allies start to vanish. Later Carter, Daniel, and Mitchell try to escape through the Stargate but find themselves not on earth but on a ship trapped beneath the polar ice cap. They learn they are on the freighter that was delivering the Stargate found in Egypt in 1939 to America. The ship is about to sink and they evacuate. They are picked up by a submarine and brought to a Naval Base where they learn the SG project never happened. They try to warn the government that the Gouald might attack earth. But the government doesn t believe and tells them that they re being released and given new identities and not to talk about what they are talking about. Three months later, the Gouald attack and the government asks for their help.