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Taking control of Scorpio, Avon guides the ship away from Xenon and heads to a different planet. Alas, this world is under the thumb of the newly regenerated Federation, which has developed an even stronger mind-control drug than before. Crew members Tarrant (Steven Pacey) and Dayna (Josette Simon) are given the task to locate the antidote for this drug, and in so doing run across an old enemy (though they don't realize it at first). "Traitor" originally aired on October 12, 1981.