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- Dick Purcell as James "Mac" McCarthy
- Joan Woodbury as Barbara Winslow
- Mantan Moreland as Jefferson "Jeff" Jackson
- Henry Victor as Dr. Miklos Sangre
- John Archer as Bill Summers
- Patricia Stacey as Alyce Sangre
- Guy Usher as Admiral Arthur Wainwright
- Marguerite Whitten as Samantha
- Leigh Whipper as Momba
- Madame Sul-Te-Wan as Tahama
- James Davis as Lazarus
- Laurence Criner as Dr. Couillie