Stargate SG1: Complete Season 9

Stargate SG-1 is an action-packed sci-adventure series involving a team of U.S. Air Force soldiers and scientists that uses ancient portals called Stargates to travel instantaneously from their Stargate Command base in the Rocky Mountains to other planets to explore, forge alliances, defuse crises, establish trade, investigate ancient mysteries, and defend Earth from such hostile forces as the Goa'uld and the Replicators.

With the departure of Gen. Jack O'Neill, Stargate Command enters a new era in season 9. His long time friend and mentor, Gen. Hank Landry, has been called back from retirement to replace him as the new head of Stargate Command, ready to lead the SG-1 team to fight a new enemy the "Ori" and their ambassadors the "Prior". The Ori not only have unleashed a deadly plague on Earth - in their quest to rule the world they are planning to stage a massive crusade against all dissidents. They constructed a fleet of ships and a "supergate" through which to invade Earth.