X: The Unknown poster
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X: The Unknown

6.119561h 21mMovieHorrorScience FictionMystery

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…

DirectorLeslie Norman
WriterJimmy Sangster
ProducersAnthony Hinds·Michael Carreras

Where to watch

MometuMometu
Availability shown for United States · rights vary by country

Cast · Directed by Leslie Norman

DJDean Jagger
Dean Jagger
Dr. Adam Royston
LMLeo McKern
Leo McKern
Inspector McGill
WLWilliam Lucas
William Lucas
Peter Elliott
ECEdward Chapman
Edward Chapman
John Elliott
JHJohn Harvey
John Harvey
Maj. Cartwright
MRMichael Ripper
Michael Ripper
Sgt. Harry Grimsdyke
ANAnthony Newley
Anthony Newley
LCpl. 'Spider' Webb
IMIan MacNaughton
Ian MacNaughton
Pvt. Haggis
PHPeter Hammond
Peter Hammond
Lt. Bannerman
KCKenneth Cope
Kenneth Cope
Pvt. Lansing
MB
Michael Brooke
Willie Harding
FHFrazer Hines
Frazer Hines
Ian Osborn

More from Dean Jagger · Lead actor

Columbo
Columbo
1971 · 8.1
The Fugitive
The Fugitive
1963 · 7.3
The Alfred Hitchcock Hour
The Alfred Hitchcock Hour
1962 · 7.9
The Waltons
The Waltons
1972 · 7.1
St. Elsewhere
St. Elsewhere
1982 · 5.7
The Twilight Zone
The Twilight Zone
1959 · 8.5
Studio One
Studio One
1948 · 5.4
Dr. Kildare
Dr. Kildare
1961 · 5.7
The Philco Television Playhouse
The Philco Television Playhouse
1948 · 6.6
The F.B.I.
The F.B.I.
1965 · 5.6
See all fromDean Jagger

More from Leo McKern · Co-star actor

Great Performances
Great Performances
1971 · 6.1
Play for Today
Play for Today
1970 · 6.6
BBC Play of the Month
BBC Play of the Month
1965 · 5.2
The Wednesday Play
The Wednesday Play
1964 · 5.2
Screen Two
Screen Two
1985 · 7.1
ITV Playhouse
ITV Playhouse
1967 · 7.0
ITV Saturday Night Theatre
ITV Saturday Night Theatre
1969 · 7.0
Space: 1999
Space: 1999
1975 · 7.1
Thirty-Minute Theatre
Thirty-Minute Theatre
1965 · 4.2
The Adventures of Robin Hood
The Adventures of Robin Hood
1955 · 6.4
See all fromLeo McKern

More from Leslie Norman · Director

The Avengers
The Avengers
1961 · 7.8
The Saint
The Saint
1962 · 7.4
The Champions
The Champions
1968 · 6.5
The Persuaders!
The Persuaders!
1971 · 7.7
Return of the Saint
Return of the Saint
1978 · 7.0
Gideon's Way
Gideon's Way
1965 · 7.0
Department S
Department S
1969 · 5.5
The Baron
The Baron
1966 · 5.9
Shirley's World
Shirley's World
1972 · 6.0
Dunkirk
Dunkirk
1958 · 6.9
See all fromLeslie Norman

More like this

The Giant Behemoth
The Giant Behemoth
1959 · 5.8
Quatermass 2
Quatermass 2
1957 · 6.4
The Last House
The Last House
2026 · 6.8
Them!
Them!
1954 · 6.8
Underwater
Underwater
2020 · 6.3
Island of Terror
Island of Terror
1966 · 5.9
The Asphyx
The Asphyx
1972 · 6.0
The Return of Doctor X
The Return of Doctor X
1939 · 6.0
The End of Oak Street
The End of Oak Street
2026 · 7.1
The Car
The Car
1977 · 6.4
Twice-Told Tales
Twice-Told Tales
1963 · 6.2
Return of the Fly
Return of the Fly
1959 · 6.1

X: The Unknown — streaming FAQ

Which OTT platform streams X: The Unknown?

X: The Unknown is streaming on Mometu in United States. It's not currently on Netflix.

Is X: The Unknown on Netflix?

No, X: The Unknown is not on Netflix in United States as of October 2026. It's currently on Mometu.

Is X: The Unknown on Amazon Prime Video?

No, X: The Unknown isn't on Amazon Prime Video in United States right now. It's on Mometu instead.

Where can I watch X: The Unknown for free?

X: The Unknown is available to stream free (with ads) on Mometu in United States.