 | Charles Laughton als Sire Alain de Maletroit |
 | Boris Karloff als Voltan |
 | Sally Forrest als Blanche de Maletroit |
 | Richard Wyler als Denis de Beaulieu |
 | William Cottrell als Corbeau |
 | Alan Napier als Count Grassin |
 | Morgan Farley als Renville |
 | Paul Cavanagh als Edmond de Maletroit |
 | Michael Pate als Talon |
| Marion Gray |
| Mary Bayless |
| George Bruggeman |
| Forrest Burns |
 | George Calliga |
| Monique Chantal |
 | Jack Chefe |
 | Harry Cording |
 | Herbert Evans |
 | Franklyn Farnum |
 | Charles Horvath |
 | Forbes Murray |
 | Barry Norton |
 | William H. O'Brien |
 | Frank O'Connor |
 | Eddie Parker |
| Joe Phillips |
| Tao Porchon |
 | Scott Seaton |
 | Ellinor Vanderveer |
| Patrick Whyte |
| Robert Louis Stevenson | Story |
| Jerry Sackheim | Screenplay |
| Joseph Pevney | Director |
| Robert Laszlo | Props |
| Ted Richmond | Producer |
| Irving Glassberg | Director of Photography |
| Edward Curtiss | Editor |
| Bernard Herzbrun | Art Direction |
| Eric Orbom | Art Direction |
| Russell A. Gausman | Set Decoration |
| Julia Heron | Set Decoration |
| Rosemary Odell | Costume Design |
| Bud Westmore | Makeup Artist |
| Joan St. Oegger | Hairstylist |
| Joseph Gershenson | Music Director |
| Hans J. Salter | Music |
| William Lava | Music |
| Frank Skinner | Music |
| Herman Stein | Music |
| Miklós Rózsa | Music |
| Nathan H. Juran | Art Direction |
| Glenn E. Anderson | Sound |
| Leslie I. Carey | Sound |
