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The working title of this film was Terror of the South Seas. While Ralf Harolde's character is referred to as "Rod Grady" in the film, some reviewers listed the character as "Rod Hogan." A Hollywood Reporter news item from January 1941 states that writer Samuel J. Warshawsky was assigned by supervising producer Joseph Santley to work on the screenplay for this film, but it has not been determined if either man contributed to the released film. According to Universal press materials, this was the first picture that actor Leo Carrillo made as part of his new contract with the studio. Hollywood Reporter stated in March 1941 that Universal signed director George Waggner to a seven-year contract because of his work on this film and Man-Made Monster . Hollywood Reporter also reported that actor John Eldredge's scenes in the Universal film The Black Cat (see entry above) were rushed so that he could appear in the film. Modern sources list Walter Strenge as camera operator and include Eddie Parker, Dale Van Sickel and John Burton in the cast.