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Patricia Neal as Susan North |
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Helmut Dantine as The Stranger |
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Derek Bond as Arthur Walker |
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Cyril Luckham as Dr. Meinard |
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Willoughby Gray as Tom Harding |
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Marigold Russell as Gretchen Harding |
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Arthur Young as Scientist |
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Kenneth Edwards as Charles Dixon |
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David Garth as First Police Officer |
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Stanley Van Beers as General |
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Nigel Green as Second Police Officer |
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Graham Stuart as Police Chief |
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Jack Gwillim as Representative of Parliament (uncredited) |
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John Le Mesurier as Official/Man at Desk (uncredited) |
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Hugh Moxey as Secretary of the Interior (uncredited) |
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Peter Sallis as Soldier (uncredited) |
| Writing | Desmond Leslie | Screenstory |
| Production | Gene Martel | Producer |
| Camera | Kenneth Talbot | Director of Photography |
| Sound | Eric Spear | Original Music Composer |
| Directing | Burt Balaban | Director |
| Production | Roy Rich | Associate Producer |
| Art | John Elphick | Art Direction |
| Costume & Make-Up | Barbara Ritchie | Hairdresser |
| Costume & Make-Up | Laura Nightingale | Wardrobe Supervisor |
| Camera | Robert Walker | Camera Operator |
| Costume & Make-Up | Nell Taylor | Makeup Artist |
| Editing | Peter R. Hunt | Editor |
| Production | George R. Busby | Production Manager |
| Directing | Tilly Day | Continuity |
| Directing | Barry Delmaine | Assistant Director |
| Sound | John Cape | Sound |
| Writing | Hans Jacoby | Screenplay |
| Production | Burt Balaban | Producer |
