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Working titles of this film were Alter Ego and The Crime of Joan Ellis. The film marked radio personality Arch Oboler's first directorial effort. The Oboler story on which this film is based, "Alter Ego," was originally produced for radio broadcast. Though the date of the original radio broadcast has not been determined, a book on Oboler's radio plays published in 1940 indicates that Bette Davis starred in a broadcast of "Alter Ego" that was directed by Bill Bacher. Hollywood Reporter production charts list actor Tim Murdock in the cast, but his appearance in the released film has not been confirmed.