- HD 1080
- Runtime: 92m.
- Status: Released
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- Languages: en
- Country: United Kingdom
- Director: Robert Hartford-Davis
- Stars: Ann Todd, Patrick Magee, Tony Beckley, Percy Herbert, Suzanna Leigh
- keywords: drowning, religion and supernatural, cult, murder, serial killer, slasher, maniac, strangulation, sexual repression, religious cult, supernatural power, lesbian, religious leader, religious fanaticism
- Production_studio: World Arts Media
- Slogan: It's a Sickness of the Soul!
- providers: Fandor Amazon Channel
- The The Fiend is featured in the top rankings of 1972
- #82 in Top Horror Movies of 1972
Led by a sinister minister, a controlling religious sect called the Brethren has taken control of widow Birdy Wemys, sending her unstable son, Kenny, into a spiraling descent into madness and murder. No woman is safe when Kenny's religious mania overpowers him and leads to a rampage of carnage and chaos!