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Many changes await the SGC has Brig. Gen. Jack O'Neill is promoted to head up Homeworld Security and appoints his replacement, Gen. Hank Landry. Daniel and Teal'c must also make adjustments as they are temporarily without Carter. Lt. Col. Cameron Mitchell joins the Stargate Program and finds himself quickly occupied with the missions of SG-1. Soon, they must all work together as a new enemy is revealed to Daniel in a vision—the Orii, evil ascended beings.