

MovieHorrorScience FictionMystery
X: The Unknown
It rises from 2000 miles below the earth to melt everything in its path!
6.1(78)19561h 21m
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.
- Director
- Leslie Norman
- Created by
- Michael Carreras
- Writers
- Jimmy Sangster,Jimmy Sangster
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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

Norman MacOwan
Old Tom
Anthony Sagar
Rear Gate Night Watchman

Edwin Richfield
Soldier Burned on Back

John Stone
Gerry
Loading cast…
Crew
Directing
- Leslie NormanDirector
- Christopher SuttonAssistant Director
- June RandallContinuity
Writing
- Jimmy SangsterScreenplay
- Jimmy SangsterStory
Production
- Anthony HindsProducer
- Michael CarrerasExecutive Producer
- Jimmy SangsterProduction Manager
Camera
- Gerald GibbsDirector of Photography
- Len HarrisCamera Operator
- Mike RutterClapper Loader
Editing
- James NeedsEditor
Sound
- James BernardOriginal Music Composer
- John HollingsworthMusic Director
- Jock MaySound Mixer
- Alfred CoxSound Editor
Art
- Edward MarshallArt Direction
Costume & Make-Up
- Philip LeakeyMakeup Artist
- Molly ArbuthnotWardrobe Supervisor
Crew
- Philip LeakeyMakeup Effects
- Jack CurtisSpecial Effects