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Crusade is the nineteenth episode of the ninth season of Stargate SG-1, and the one hundred ninety-third episode overall. Vala takes over Dr. Jackson's body in order to give SG-1 important news about the Ori crusade.
Guest Stars: Claudia Black (Vala), Garry Chalk (Colonel Chekov), Dan Shea (Sgt. Siler), Doug Abrahams (Prior), Alex Dafoe (Halstrom), Tim Guinee (Tomin), Tamlyn Tomita (Shen), Michael Ironside (Seevis), Daniella Evangelista (Denya)