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UNCLE agent April Dancer poses as her lookalike, Princess Fatima, the missing heir to the throne of oil-rich Zalamar. Meanwhile, the real Fatima endures psychological torture at the hands of her power-mad uncle (Michael Ansara), Zalamar's Grand Vizier. Fellow UNCLE operative Mark Slate ends up racing to the rescue of both ladies. Written by Max Hodge, "The Prisoner of Zalamar Affair" originally aired on September 20, 1966.