 | Beverly Garland als Joyce Webster, aka Jane Marvin |
 | Bruce Bennett als Dr. Eric Lorimer |
 | Lon Chaney Jr. als Manon |
 | George Macready als Dr. Mark Sinclair |
 | Frieda Inescort als Mrs. Lavinia Hawthorne |
 | Richard Crane als Paul Webster |
 | Douglas Kennedy als Dr. Wayne McGregor |
 | Bill Bradley als Patient 'Number Six' (uncredited) |
 | Hal K. Dawson als Conductor |
 | Dudley Dickerson als Porter |
 | John Frederick als 1st Male Nurse (uncredited) |
 | Ruby Goodwin als Louann |
 | Ken Kane als Third Male Nurse (uncredited) |
 | Boyd Stockman als Alligator-headed Paul |
| Vince Townsend Jr. als Toby |
| Lee Warren als 2nd Male Nurse (uncredited) |
| Roy Del Ruth | Director |
| Orville H. Hampton | Screenplay |
| Joseph Kish | Set Decoration |
| Lyle R. Wheeler | Art Direction |
| Ben Nye | Makeup Artist |
| John B. Mansbridge | Art Direction |
| Irving Gertz | Original Music Composer |
| Jack Leewood | Producer |
| Eve Newing | Hairstylist |
| Charles O'Neal | Story |
| Orville H. Hampton | Story |
| Walter M. Scott | Set Decoration |
| Karl Struss | Director of Photography |
| Dick Smith | Makeup Artist |
| Harry Gerstad | Editor |
| Herbert E. Mendelson | Assistant Director |
| Herbert E. Mendelson | Production Manager |
| George Westenhiser | Property Master |
| W.D. Flick | Sound |
| Arthur Cornell | Sound Effects |
| Fred Etcheverry | Special Effects |
| Bob Bryant | Stunts |
| Ollie Hughes | Costume Supervisor |
| William McCrary | Costume Supervisor |
| Harry Gerstad | Supervising Film Editor |
| Orven Schanzer | First Assistant Editor |
| Mary Coleman | Script Supervisor |
