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Richard Greene as Sir Ronald Burton / Richard Beckett |
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Boris Karloff as Dr. Meissen |
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Stephen McNally as Count Karl von Bruno |
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Rita Corday as Countess Elga von Bruno |
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Lon Chaney Jr. as Gargon |
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John Hoyt as Count Steiken |
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Michael Pate as Count Ernst von Melcher |
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Nancy Valentine as Therese von Wilk |
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Tudor Owen as Romley |
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Henry Corden as Fender |
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Otto Waldis as Innkeeper Krantz |
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Roy Engel as Burgher |
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Leslie Denison as Sir David Layton (uncredited) |
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Bernard Szold as Koppich (uncredited) |
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Jack Perrin as Hunter (uncredited) |
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Forrest Burns as Guard (uncredited) |
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Chuck Hamilton as Guard (uncredited) |
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John Roy as Guard (uncredited) |
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Victor Romito as Guard (uncredited) |
| Directing | Nathan Juran | Director |
| Production | William Alland | Producer |
| Writing | Jerry Sackheim | Screenplay |
| Camera | Irving Glassberg | Director of Photography |
| Art | Russell A. Gausman | Set Decoration |
| Art | Alfred Sweeney | Art Direction |
| Costume & Make-Up | Joan St. Oegger | Hairstylist |
| Sound | Paul Sawtell | Music |
| Sound | Hans J. Salter | Music |
| Sound | Paul Dessau | Music |
| Art | Oliver Emert | Set Decoration |
| Sound | William Lava | Music |
| Costume & Make-Up | Bud Westmore | Makeup Artist |
| Sound | Frank Skinner | Music |
| Sound | Joseph Gershenson | Music Director |
| Sound | Charles Previn | Music |
| Sound | Milton Rosen | Music |
| Writing | Jerry Sackheim | Story |
| Art | Bernard Herzbrun | Art Direction |
| Editing | Russell F. Schoengarth | Editor |
| Sound | Joe Lapis | Sound |
| Visual Effects | David S. Horsley | Visual Effects |
| Sound | Leslie I. Carey | Sound |
| Costume & Make-Up | Ray Romero | Makeup Artist |
| Directing | William Holland | Assistant Director |
