 | Ray Milland als Guy Carrell |
 | Hazel Court als Emily Gault |
 | Richard Ney als Miles Archer |
 | Heather Angel als Kate Carrell |
 | Alan Napier als Dr. Gideon Gault |
 | John Dierkes als Sweeny |
 | Dick Miller als Mole |
 | Brendan Dillon als Minister |
 | Clive Halliday als Judson |
| Ronald Stein | Original Music Composer |
| Ronald Sinclair | Editor |
| Marjorie Corso | Costume Design |
| Ray Russell | Screenplay |
| Floyd Crosby | Director of Photography |
| Daniel Haller | Art Direction |
| Roger Corman | Director |
| Samuel Z. Arkoff | Producer |
| Roger Corman | Producer |
| Gene Corman | Executive Producer |
| Charles Beaumont | Screenplay |
| Francis Ford Coppola | Assistant Director |
| Harry Reif | Set Decoration |
| Jack Bohrer | Production Manager |
| Lou LaCava | Makeup Artist |
| Lloyd Garnell | Lighting Technician |
| Richard M. Rubin | Props |
| David Blangsted | Assistant Editor |
| Betty Crosby | Script Supervisor |
| John Bury Jr. | Sound |
| Burt Shonberg | Painter |
| Charles Hannawalt | Key Grip |
| Jonathan Haze | Producer's Assistant |
| Les Baxter | Additional Music |
| Edgar Allan Poe | Short Story |
