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Boris Karloff as Nahum Witley |
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Nick Adams as Stephen Reinhart |
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Suzan Farmer as Susan Witley |
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Freda Jackson as Letitia Witley |
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Terence de Marney as Merwyn |
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Patrick Magee as Dr. Henderson |
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Sheila Raynor as Miss Bailey |
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Harold Goodwin as Taxi Driver |
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Paul Farrell as Jason |
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Sydney Bromley as Pierce |
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Billy Milton as Henry |
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Leslie Dwyer as Potter |
| Directing | Daniel Haller | Director |
| Writing | H.P. Lovecraft | Short Story |
| Sound | Philip Martell | Music Director |
| Camera | Paul Beeson | Director of Photography |
| Editing | Alfred Cox | Editor |
| Art | Colin Southcott | Art Direction |
| Sound | Don Banks | Original Music Composer |
| Writing | Jerry Sohl | Screenplay |
| Production | Pat Green | Producer |
| Production | Samuel Z. Arkoff | Executive Producer |
| Production | James H. Nicholson | Executive Producer |
| Directing | Dennis Hall | Assistant Director |
| Camera | Cecil Cooney | Camera Operator |
| Sound | Ken Rawkins | Sound Recordist |
| Sound | Bob Jones | Sound Recordist |
| Sound | Alban Streeter | Sound Editor |
| Sound | Alan Corder | Sound Editor |
| Directing | Tilly Day | Continuity |
| Costume & Make-Up | Jimmy Evans | Makeup Artist |
| Costume & Make-Up | Bobbie Smith | Hairstylist |
| Costume & Make-Up | Laurel Staffell | Wardrobe Designer |
| Crew | Wally Veevers | Special Effects |
| Crew | Ernie Sullivan | Special Effects |
