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UK
(London) (premiere)
1956-09-21
UK
No data
1956-11-05
Argentina
No data
1957
USA
No data
1957-05
Denmark
No data
1957-06-24
West Germany
No data
1957-10-22
Portugal
No data
1957-10-30
Finland
No data
1959-02-20
X the Unknown
(Original title)
La incógnita X
Argentina (original subtitled version)
X the Unknown
Australia
O Estranho de um Mundo Perdido
Brazil
X the Unknown
Canada (English title)
X - den ukendte fare
Denmark
X - tuntematon
Finland
X - okänd
Finland (Swedish title)
X the Unknown
France
X: L'inconnu
France (tv title)
Το τέρας από τα βάθη της Γης
Greece
X contro il centro atomico
Italy
怪獣ウラン
Japan (Japanese title)
Het onbekende
Netherlands (informal literal title)
La incógnita X
Panama
X - czynnik nieznany
Poland
X, o Inimigo Desconhecido
Portugal
X Necunoscutul
Romania
Икс: Неизвестное
Soviet Union (Russian title)
Lo desconocido
Spain
X the Unknown
UK
X the Unknown
USA
XX unbekannt
West Germany
Sex & Nudity
None
none.
Violence & Gore
Mild
An explosion killing one person.
A soldier shows Royston his burned back. (mildly graphic)
A young boy's burned chest is shown.
X kills a scientist. (graphic)
X kills two soldiers.
A scientist discovers a rotten corpse. (mildly graphic)
X kills a guard. (mildly graphic)
Profanity
None
1 instance each of "blimey" and "stupid".
Alcohol, Drugs & Smoking
None
3 instances of cigarette smoking and 1 instance of pipe smoking.
Frightening & Intense Scenes
Mild