| Country | Date | |
|---|---|---|
| USA | 16 June 1954 | (New York City, New York) |
| USA | 19 June 1954 | |
| Mexico | 19 August 1954 | |
| Japan | 30 August 1954 | |
| Finland | 5 November 1954 | |
| Italy | 1955 | |
| France | 3 June 1955 | |
| Belgium | 1 July 1955 | |
| Portugal | 30 January 1956 | |
| Denmark | 23 March 1959 | |
| West Germany | 15 September 1960 | |
| West Germany | 22 June 1974 | (TV premiere) |
| O Mundo em Perigo | Brazil (imdb display title) / Portugal |
| Ők! | Hungary |
| Assalto alla terra | Italy |
| Atomische duivels | Belgium (Flemish title) |
| Démons atomiques | Belgium (French title) |
| Des monstres attaquent la ville | France |
| Dom kommer! | Sweden (TV title) |
| El mundo en peligro | Mexico |
| Formicula | West Germany |
| I F.B.I. se synagermo | Greece (transliterated ISO-LATIN-1 title) |
| La humanidad en peligro | Spain |
| One! | Poland |
| Politiet og uhyret | Denmark |
| Són elles! | Spain (Catalan title) |
| Spindlarna | Sweden |
| Them | USA (poster title) |
| Yön pedot | Finland |
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