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Vincent Price as Paul Toombes |
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Peter Cushing as Herbert Flay |
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Robert Quarry as Oliver Quayle |
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Adrienne Corri as Faye |
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Linda Hayden as Elizabeth Peters |
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Natasha Pyne as Julia Wilson |
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Michael Parkinson as TV Interviewer |
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Barry Dennen as Gerry Blount |
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Ellis Dale as Alfred Peters |
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Catherine Willmer as Louise Peters |
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Jenny Lee Wright as Carol Clayton |
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Julie Crosthwaite as Ellen |
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Ian Thompson as Bradshaw |
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John Garrie as Inspector Harper |
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Peter Halliday as Psychiatrist |
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Basil Rathbone as Basil (archive footage) |
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Boris Karloff as (archive footage) |
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Hyma Beckley as Passenger on Quayside (uncredited) |
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George Blackler as George the Make-Up Artist (uncredited) |
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Robert Cawdron as CID Inspector (uncredited) |
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Michael Craze as Reporter (uncredited) |
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David Jackson as Police Sergeant (uncredited) |
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Patrick Jordan as Ship's Steward (uncredited) |
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Earl Rhodes as Boy Fishing (uncredited) |
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Pam Rose as Pretty Blonde (uncredited) |
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Christopher Sandford as Reporter (uncredited) |
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Reg Thomason as Hollywood Party Guest (uncredited) |
| Directing | Jim Clark | Director |
| Production | Milton Subotsky | Producer |
| Writing | Greg Morrison | Screenplay |
| Production | Samuel Z. Arkoff | Executive Producer |
| Writing | Ken Levison | Screenplay |
| Production | Max Rosenberg | Producer |
| Production | Pat Green | Production Manager |
| Sound | Douglas Gamley | Music |
| Art | John Siddall | Assistant Art Director |
| Production | John Dark | Associate Producer |
| Costume & Make-Up | George Blackler | Makeup Artist |
| Directing | Allan James | First Assistant Director |
| Art | Bill Waldron | Construction Manager |
| Crew | Ray Parslow | Cinematography |
| Production | Rose Tobias Shaw | Casting |
| Editing | Clive Smith | Editor |
| Costume & Make-Up | Helen Lennox | Hairdresser |
| Art | Tony Curtis | Art Direction |
| Camera | Ken Coles | Camera Operator |
| Directing | Michael Green | Third Assistant Director |
| Crew | Norman Kerss | Special Effects |
| Production | Ruggero Salvadori | Production Manager |
| Crew | Roy Spencer | Special Effects |
| Sound | Danny Daniel | Sound Recordist |
| Camera | Ian Smith | Clapper Loader |
| Sound | Peter Horrocks | Sound Editor |
| Sound | Gerry Humphreys | Sound Recordist |
| Directing | Nigel Wooll | Second Assistant Director |
| Costume & Make-Up | Dulcie Midwinter | Wardrobe Master |
| Directing | Lorna Selwyn | Continuity |
