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- Warren Hull as Mandrake the Magician
- Doris Weston as Betty Houston
- Al Kikume as Lothar
- Rex Downing as Tommy Houston
- Edward Earle as Doctor Andre Bennett
- Forbes Murray as Professor Houston
- Kenneth MacDonald as James Webster
- Don Beddoe as Frank Raymond
- Dick Curtis as Dorgan
- John Tyrrell as Dirk
- Sam Ash as George Regan