Movie guide
X: The Unknown (1956): movie guide
X: The Unknown (1956) is a Horror, Science Fiction, Mystery running about 81 minutes. It holds a TMDB score of 6.1/10 from 79 votes. Notable cast includes Dean Jagger, Leo McKern, William Lucas, Edward Chapman. Cinema Box covers trailers, cast, and details for discovery — not full streaming.
- Released: 1956-09-21
- Runtime: 81 min
- TMDB: 6.1/10
- Genres: Horror, Science Fiction, Mystery
Last updated: 2026-11-11 · First listed: 1956-09-21
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What is X: The Unknown about?
Army radiation experiments awaken a subterranean monster from a fissure that feeds on energy and proceeds to terrorise a remote Scottish village. An American research scientist at a nearby nuclear plant joins with a British investigator to discover why the victims were radioactively burned and why, shortly thereafter, a series of radiation-related incidents are occurring in an ever-growing straight line away from the fissure.
Cast highlights
X: The Unknown features Dean Jagger, Leo McKern, William Lucas, Edward Chapman, John Harvey, Michael Ripper. Open the Cinema Box title page for the full cast list and character credits.
Key facts
Release date: 1956-09-21. Runtime: 81 minutes. TMDB score: 6.1/10 (79 votes). Genres: Horror, Science Fiction, Mystery. Original language: en. Status: Released.
Discover X: The Unknown on Cinema Box
Cinema Box is a movie and TV discovery app for Android. Use it to browse X: The Unknown, watch official trailers when available, save titles to your list, and plan what to watch — without hosting or streaming full films.
Frequently asked questions
- What genre is X: The Unknown?
- X: The Unknown is listed as Horror, Science Fiction, Mystery on TMDB.
- How long is X: The Unknown?
- X: The Unknown runs about 81 minutes.
- Who stars in X: The Unknown?
- Cast highlights include Dean Jagger, Leo McKern, William Lucas, Edward Chapman, John Harvey, Michael Ripper.
- Does Cinema Box stream X: The Unknown?
- No. Cinema Box is discovery-only — trailers, details, ratings, and watchlists. It does not host or stream full movies.
- Where can I track X: The Unknown?
