 | Boris Karloff als John Gray |
 | Bela Lugosi als Joseph |
 | Henry Daniell als Dr. Wolfe 'Toddy' MacFarlane |
 | Edith Atwater als Meg Camden |
 | Russell Wade als Donald Fettes |
 | Rita Corday als Mrs. Marsh |
 | Sharyn Moffett als Georgina Marsh |
 | Donna Lee als Street Singer |
 | Ted Billings als Townsman (uncredited) |
 | Robert Clarke als Richardson a Medical Student (uncredited) |
 | Mary Gordon als Mary McBride (uncredited) |
 | Milton Kibbee als Dan (uncredited) |
 | Bill Williams als Survis, Medical Student |
 | Bobby Burns |
| Aina Constant |
 | Carl Kent |
 | Ethan Laidlaw |
| Jim Moran als Angus - Horse Trader (uncredited) |
 | Larry Wheat |
| J.R. Whittredge | Editor |
| Walter E. Keller | Art Direction |
| Darrell Silvera | Set Decoration |
| Val Lewton | Screenplay |
| Philip MacDonald | Screenplay |
| Albert S. D'Agostino | Art Direction |
| Robert Louis Stevenson | Story |
| Roy Webb | Original Music Composer |
| Robert Wise | Director |
| Robert De Grasse | Director of Photography |
| John Sturtevant | Set Decoration |
| Renié | Costume Design |
| Val Lewton | Producer |
| Jack J. Gross | Executive Producer |
| Mel Berns | Makeup Artist |
| C. Bakaleinikoff | Music Director |
| Terry Kellum | Sound Re-Recording Mixer |
| Harry Scott | Assistant Director |
| Bailey Fesler | Sound Recordist |
| Charles Burke | Camera Operator |
