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A criminal mastermind named Spectre (Peter Brocco) uses special coins to render himself and his henchmen invisible while committing crimes. Hoping to trap the crooks, Clark Kent (George Reeves) pretends that he'd like to join their gang. When Clark's true motives are discovered, he is thrown out of a plane in flight--which of course has no ill effect on him, inasmuch as he is really Superman and is quite accustomed to sailing through the air. The climax of the episode finds the extremely visible bad guys dukeing it out with a temporarily invisible Superman!