 | Dorothy McGuire als Helen |
 | George Brent als Professor Warren |
 | Ethel Barrymore als Mrs. Warren |
 | Kent Smith als Dr. Parry |
 | Rhonda Fleming als Blanche |
 | Gordon Oliver als Steve Warren |
 | Elsa Lanchester als Mrs. Oates |
 | Sara Allgood als Nurse Barker |
 | Rhys Williams als Mr. Oates |
 | James Bell als Constable |
 | Erville Alderson als Dr. Harvey (uncredited) |
 | Ellen Corby als Neighbour (uncredited) |
 | Myrna Dell als Murder Victim (uncredited) |
 | George Holmes als The Killer's 'Shadow' (uncredited) |
 | Stanley Price als Starry-eyed Man (uncredited) |
 | Robert Siodmak als The Killer's 'Eye' (uncredited) |
 | Richard Tyler als Freddy (uncredited) |
 | Charles Wagenheim als Desk Clerk (uncredited) |
 | Larry Wheat als Minister (uncredited) |
| Robert Siodmak | Director |
| Ethel Lina White | Novel |
| Jack Okey | Art Direction |
| Mel Dinelli | Screenplay |
| Harry Gerstad | Editor |
| Dore Schary | Producer |
| Harry Marker | Editor |
| Albert S. D'Agostino | Art Direction |
| Roy Webb | Original Music Composer |
| Nicholas Musuraca | Director of Photography |
| Fred Fleck | Production Manager |
| Edward Stevenson | Costume Design |
| Darrell Silvera | Set Decoration |
| Harry Scott | Assistant Director |
| John L. Cass | Sound |
| Terry Kellum | Sound |
| Vernon L. Walker | Special Effects |
| Chris Crowell | Digital Compositor |
| Gordon Carveth | Stunts |
| C. Bakaleinikoff | Music Director |
| Samuel Hoffman | Musician |
| Edgar Peterson | Production Assistant |
