On a daring mission to rescue victims of a Goa'uld attack, Sam Carter's body is taken over by a Goa'uld. When Carter and the SG-1 team return to Earth, an alien assassin follows to destroy the rebel Goa'uld, Jolinar of Malkshur, within Carter. Can Jack O'Neill eliminate the Goa'uld without killing her? Or will the assassin kill them both?
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