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Although she refuses to acknowledge the fact, Cally (Jan Chappell) is in the telepathic thrall of a derelict space vessel. Things heat up when the artificially sustained intelligence of the ship's long-deceased navigator causes Cally to behave in a near-homicidal manner toward the other crew members of the Liberator. One of the few Blakes 7 episodes to dispense with a guest-supporting cast, "Sarcophagus" was originally broadcast on March 3, 1980.