| Marshall Thompson | ... | Maj. Cummings | |
| Kynaston Reeves | ... | Prof. R.E. Walgate | |
| Kim Parker | ... | Barbara Griselle | |
| Stanley Maxted | ... | Col. Butler | |
| Terry Kilburn | ... | Capt. Al Chester (as Terence Kilburn) | |
| James Dyrenforth | ... | Mayor | |
| Robert MacKenzie | ... | Const. Gibbons | |
| Peter Madden | ... | Dr. Bradley | |
| Gil Winfield | ... | Dr. Warren | |
| Michael Balfour | ... | Sgt. Kasper | |
| Launce Maraschal | ... | Melville | |
| Meadows White | ... | Ben Adams (as R. Meadows White) | |
| E. Kerrigan Prescott | ... | Atomic Engineer (as Kerrigan Prescott) | |
| Lala Lloyd | ... | Amelia Adams | |
| Shane Cordell | ... | Nurse | |
| rest of cast listed alphabetically: | |||
| Sheldon Allan | ... | Sentry (uncredited) | |
| Alexander Archdale | ... | Minister (uncredited) | |
| Tom Watson | ... | Technical Sergeant (uncredited) | |
Directed by | |||
| Arthur Crabtree | |||
Writing credits | ||
| Herbert J. Leder | (screenplay) | |
| Amelia Reynolds Long | (original story "The Thought Monster") | |
Produced by | |||
| John Croydon | .... | producer | |
| Richard Gordon | .... | executive producer (uncredited) | |
| Ronald Kinnoch | .... | co-producer (uncredited) | |
| Charles F. Vetter | .... | executive producer (uncredited) | |
Original Music by | |||
| Buxton Orr | |||
Cinematography by | |||
| Lionel Banes | (lighting cameraman) | ||
Film Editing by | |||
| R.Q. McNaughton | |||
Makeup Department | |||
| Barbara Barnard | .... | hairdressing | |
| Jim Hydes | .... | makeup artist | |
Production Management | |||
| Ronald Kinnoch | .... | production manager | |
Second Unit Director or Assistant Director | |||
| Douglas Hickox | .... | assistant director | |
Art Department | |||
| John Elphick | .... | set designer | |
Sound Department | |||
| Peter Davies | .... | sound recordist | |
| Terry Poulton | .... | dubbing editor | |
Special Effects by | |||
| Peter Neilson | .... | special effects | |
| Flo Nordhoff | .... | special effects (as Ruppel & Nordhoff) | |
| Karl-Ludwig Ruppel | .... | special effects (as Ruppel & Nordhoff) | |
Camera and Electrical Department | |||
| Martin Curtis | .... | photographer: second unit | |
| Leo Rogers | .... | camera operator | |
Costume and Wardrobe Department | |||
| Anna Duse | .... | dress supervisor | |
Music Department | |||
| Frederick Lewis | .... | conductor (as Frederic Lewis) | |
Other crew | |||
| Hazel Swift | .... | continuity | |
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| King of the Rocket Men | Avatar | So Sweet, So Dead | Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb | Dreamcatcher |
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| Full cast and crew | Company credits | External reviews |
| News articles | IMDb Horror section | IMDb UK section |
Fiend has everything that a 50's Sci-Fi movie should have; a really square hero that saves the day, a beautiful female lead that falls for him, atomic power misused, and an invisible monster that sucks the brains out of its victums.
It is the stop motion animation at the end when the monster(s) become visible that really makes this film work. Without the animation by Peter Neilson and Ruppell this would be just another 50's atomic caution tale.