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A girl named Madeleine (Leigh Madison) steals Peter Brady's passport so that her boyfriend Nick can pose as "The Invisible Man" and smuggle narcotics into the country. Teaming up with plucky policewoman Sgt. Winter (Jeanette Starke), Brady himself dons a disguise to go undercover at a Soho den of inquity, the better to trap Nick and his cohorts. Amusingly, the role of Nick is played by Tim Turner, who had been providing the voice of Peter Brady, sans screen credit, ever since the first episode of The Invisible Man.