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| Cast |
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| Dr Namaroff | CUSHING, Peter |
| Professor Carl Meister | LEE, Christopher |
| Paul Heitz | PASCO, Richard |
| Carla Hoffman | SHELLEY, Barbara |
| Professor Heitz | GOODLIFFE, Michael |
| Inspector Kanof | TROUGHTON, Patrick |
| the coroner | O'CONOR, Joseph |
| chatelaine | HYMAN, Prudence |
| Ratoff | WATSON, Jack |
| Hans | PHILLIPS, Redmond |
| Bruno Heitz | LONGHURST, Jeremy |
| Sascha Cass | GILPIN, Toni |
| Martha | HEMSON, Joyce |
| Cass | WILLIAMSON, Alister |
| policeman | PEAKE, Michael |
| nurse (uncredited) | NESBITT, Sally |
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| Credits |
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| Directed by | FISHER, Terence |
| Production Company | Hammer Film Productions |
| Produced by | NELSON KEYS, Anthony |
| Production Manager | WEEKS, Don |
| Production Secretary (uncredited) | WHITE, Maureen |
| Assistant Director | BATT, Bert |
| Assistant Director (2nd) (uncredited) | HARLOW, Hugh |
| Assistant Director (3rd) (uncredited) | VICTOR, Stephen |
| Continuity | HARLOW, Pauline |
| Screenplay | GILLING, John |
| Based on a story by | DEVINE, J. Llewellyn |
| Director of Photography | REED, Michael |
| Camera Operator | COONEY, Cec |
| Focus Puller (uncredited) | SHINEROCK, John |
| Clapper Loader (uncredited) | RICHMOND, Anthony B. |
| Stills (uncredited) | EDWARDS, Tom |
| Special Effects | PEARSON, Syd |
| Supervising Editor | NEEDS, James |
| Editor | PERKINS, Eric Boyd |
| Assistant Editor (uncredited) | NIMMO, David |
| Assistant Editor (2nd) (uncredited) | PATTEN, George |
| Production Designer | ROBINSON, Bernard |
| Art Director | MINGAYE, Don |
| Draughtsman (uncredited) | RYAN, Ken |
| Scenic Artist (uncredited) | EVANS, Burt |
| Wardrobe Mistress | BURROWS, Rosemary |
| Make-up Artist | ASHTON, Roy |
| Hairstylist | STEIGER, Frieda |
| Music composed by | BERNARD, James |
| Music Supervisor | DODS, Marcus |
| Sound Recordist | RAWKINS, Ken |
| Sound Assistants (uncredited) | THORNE, A. |
| | BUCHANAN, Tom |
| | MINGAYE, Roy |
| | SALE, Michael |
| Sound Editor | HYDE, Roy |
| Fight Arranger | DIAMOND, Peter |
| Studio | Bray Film Studios |
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