| Kieron Moore | ... | Dr. Peter Blood | |
| Hazel Court | ... | Nurse Linda Parker | |
| Ian Hunter | ... | Dr. Robert Blood, Peter's Father | |
| Kenneth J. Warren | ... | Sergeant Cook (as Kenneth Warren) | |
| Gerald Lawson | ... | Mr. Morton | |
| Fred Johnson | ... | Tregaye | |
| Paul Hardtmuth | ... | Professor Luckman | |
| Paul Stockman | ... | Steve Parker, Linda's Husband | |
| Andy Alston | ... | George Beale the Tunnel Expert | |
| rest of cast listed alphabetically: | |||
| John Romane | ... | Hanson | |
| Ruth Lee | ... | Girl (uncredited) | |
Directed by | |||
| Sidney J. Furie | |||
Writing credits | ||
| Nathan Juran | (story) (as Jerry Juran) | |
| Nathan Juran | (screenplay) (as Jerry Juran) | |
| James Kelley | (adaptation) (as James Kelly) and | |
| Peter Miller | (adaptation) | |
Produced by | |||
| George Fowler | .... | producer | |
| David E. Rose | .... | executive producer (uncredited) | |
Original Music by | |||
| Buxton Orr | |||
Cinematography by | |||
| Stephen Dade | (director of photography) | ||
Film Editing by | |||
| Antony Gibbs | |||
Art Direction by | |||
| Scott MacGregor | (as Scott Macgregor) | ||
Costume Design by | |||
| Dulcie Midwinter | |||
Makeup Department | |||
| Helen Penfold | .... | hair stylist | |
| Freddie Williamson | .... | makeup artist | |
Production Management | |||
| Buddy Booth | .... | production manager | |
Second Unit Director or Assistant Director | |||
| John Comfort | .... | assistant director | |
Sound Department | |||
| William Galter | .... | sound mixer | |
| Fred Ryan | .... | dubbing mixer | |
| Bob Winter | .... | sound editor | |
Special Effects by | |||
| Les Bowie | .... | special effects (as Leslie Bowie) | |
| Peter Neilson | .... | special effects (uncredited) | |
Camera and Electrical Department | |||
| Nicolas Roeg | .... | camera operator | |
Costume and Wardrobe Department | |||
| Dulcie Midwinter | .... | wardrobe supervisor | |
Music Department | |||
| Philip Martell | .... | musical director | |
Other crew | |||
| Gladys Reeve | .... | continuity | |
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| The Black Widow | The Invisible Monster | King of the Rocket Men | Dangers of the Canadian Mounted | The Revenge of Frankenstein |
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| Full cast and crew | Company credits | External reviews |
| IMDb Horror section | IMDb UK section | Add this title to MyMovies |
Dr. Peter Blood (Kieron Moore) shows up in a small Cornish village shortly after the death of his father (Ian Hunter) to carry on with the old man's experiments. Maddened by his ambition and arrogance, Peter paralyzes unwilling victims with curare (African arrow poison) until their still-beating hearts can be removed and transplanted into other bodies. Will his new widowed nurse girlfriend Linda Parker (Hazel Court, as always, a strong female lead) catch on before it's too late?
Saddled with a very implausible plot and pretty minor compared to some concurrent Corman and Hammer films, this still has good acting, nice location filming, atmosphere and a decent surprise ending.