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An Ancient device on another planet causes Dr. Keller to swap bodies with a woman named Neeva, who hides her true identity from the Atlantis expedition. Once they realize what has happened, Sheppard’s team, with Dr. Carson Beckett along, must find and deactivate the device that caused the body swap. They must rescue Keller from people who believe she is Neeva, and who have troubles of their own.

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