On a mission to investigate rumors of a second Ori supergate in the Milky Way Galaxy, the Odyssey, with Lt. Col. Carter (Amanda Tapping) aboard, is attacked by Anateo, a former captain of the Lucian Alliance. After receiving the Odyssey's mayday transmission, SG-1 sets out to find the Odyssey and save its crew. Vala (Claudia Black) and Daniel (Michael Shanks) track the Odyssey's subspace beacon to a chop shop on a nearby planet, but it turns out to be an ambush and Daniel and Vala are captured and brought aboard the Odyssey. Having run out of options, SG-1 decides to use the Reole Chemical - a drug that causes people to believe they are seeing someone else - to allow Lt. Col. Mitchell (Ben Browder) to infiltrate the Lucian Alliance posing as Kefflin, another captain in the Lucian Alliance and the old friend of the Alliance's leader, Netan. Mitchell discovers that Netan double crossed Anateo by sending him on a suicide mission to take the Odyssey in order to solve some of the Alliance's internal political struggles. But now that Anateo has succeeded in taking the Odyssey and half of SG-1, he intends to discredit Netan and take control of the Lucian Alliance himself. As Carter, Daniel and Vala hatch a plan to retake the Odyssey, Mitchell learns of the Odyssey's true location, but is identified by Tenat - a rogue agent aboard Netan's mothership. Now Mitchell must pull a double cross of his own, or else be discovered.