| Actor | Boris Karloff (as Edmond Bateman), Bela Lugosi (as Dr, Richard Vollin), Lester Matthews (as Dr. Jerry Holden), Irene Ware (as Jean Thatcher), Samuel S. Hinds (as Judge Thatcher), Spencer Charters (as Col. Bertram Grant), Inez Courtney (as Mary Burns), Ian Wolfe (as Geoffrey 'Pinky'), Maidel Turner (as Harriet) |
| Associate Producer | David Diamond (2) |
| Cinematography By | Charles J. Stumar |
| Directed By | Lew Landers |
| Screenplay By | David Boehm |
| Links | https://www.imdb.com/title/tt0026912/ |