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A valuable supply of radium is stolen from the United States Medical Corps in Germany. The authorities think they've got the culprit dead to rights--but he has an airtight alibi. It is up to Superman (George Reeves) to figure out that the radium was swiped by a clever pair of twins (both played by Howland Chamberlain)--simply knowing this does not wrap up the case. In addition to a cameo appearance by future Mickey Mouse Club host Jimmy Dodd, this episode also boasts the spectacle of ubiquitious Superman bit player Stephen Carr) (the brother of director Thomas Carr) cavorting about in drag!