| Cast | Richard Greene (as Sir Ronald Burton, alias Richard Beckett), Boris Karloff (as Dr. Meissen), Stephen McNally (as Count Karl von Bruno), Rita Corday (as Countess Elga von Bruno), Lon Chaney Jr. (as Gargon), John Hoyt (as Count Steiken), Michael Pate (as Count Ernst von Melcher), Nancy Valentine (as Therese Von Wilk) |
| Directed by | Nathan Juran |
| Links | https://www.imdb.com/title/tt0044423/ |
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