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Anton Rodgers as Dr. Dyson |
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Edward Petherbridge as Lord Vaughan |
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Raymond Witch as Joy |
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June Brown as Mrs. Joy |
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Jennie Franks as Girl |
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Robert Blythe as Van Driver |
| Directing | Gareth Davies | Director |
| Writing | Emyr Humphreys | Adaptation |
| Writing | Arthur Machen | Original Story |
| Production | Huw Davies | Executive Producer |
| Sound | Alun Hoddinott | Music |
| Sound | Norman Kay | Music |
| Crew | Laurie Davies | Cinematography |
| Editing | Dave Camps | Editor |
| Art | Doug James | Production Design |
| Sound | Jack Butler | Sound Recordist |
| Sound | John Cross | Sound Mixer |
| Camera | Roger Pearce | Camera Operator |
