X: The Unknown
“It rises from 2000 miles below the earth to melt everything in its path!”
Where to watch X: The Unknown in United Kingdom
X: The Unknown is streaming on Amazon Prime Video and Amazon Prime Video with Ads in United Kingdom, and available to rent or buy on Apple TV Store, Amazon Video, Google Play Movies and YouTube. Availability checked 16 September 2026.
About X: The Unknown
X: The Unknown is a 1956 movie in the Horror, Science Fiction and Mystery genres, directed by Leslie Norman, starring Dean Jagger, Leo McKern and William Lucas. It has a runtime of 1 hour 21 minutes. It holds an average rating of 6.1/10 from 77 viewers. Below you can see where to watch X: The Unknown in United Kingdom — across streaming, rental and purchase options — along with the full cast, trailer and viewer reviews.
X: The Unknown trailer
Overview
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.
Top cast
Dean Jagger
Dr. Adam Royston
Leo McKern
Inspector McGill
William Lucas
Peter Elliott
Edward Chapman
John Elliott
John Harvey
Maj. Cartwright
Michael Ripper
Sgt. Harry Grimsdyke
Anthony Newley
LCpl. 'Spider' Webb
Ian MacNaughton
Pvt. Haggis
Peter Hammond
Lt. Bannerman
Kenneth Cope
Pvt. Lansing
Michael Brooke
Willie Harding
Frazer Hines
Ian Osborn
Neil Wilson
Russell
Stella Kimball
Willie's Nurse
Jameson Clark
Jack Harding
Jane Aird
Vi Harding
Neil Hallett
Harry, the amorous intern
Marianne Brauns
Zena, the amorous nurse
Max Brimmell
Hospital Superintendant
Brown Derby
The Vicar
Themes & keywords
Frequently asked questions
Where can I watch X: The Unknown in United Kingdom?+
In United Kingdom, you can stream X: The Unknown on Amazon Prime Video and Amazon Prime Video with Ads. It's also available to rent or buy on Apple TV Store, Amazon Video, Google Play Movies and YouTube.
Is X: The Unknown on Netflix?+
X: The Unknown is not on Netflix in United Kingdom right now, but you can stream it on Amazon Prime Video and Amazon Prime Video with Ads.
How long is X: The Unknown?+
X: The Unknown has a runtime of 1 hour 21 minutes (81 minutes).
Who stars in X: The Unknown?+
X: The Unknown stars Dean Jagger, Leo McKern, William Lucas, Edward Chapman and John Harvey.
When did X: The Unknown come out?+
X: The Unknown is a 1956 movie directed by Leslie Norman.
What genre is X: The Unknown?+
X: The Unknown is Horror, Science Fiction and Mystery film.
Who directed X: The Unknown?+
X: The Unknown was directed by Leslie Norman.
User reviews
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