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Bernard Lee as Henry Houghton |
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William Sylvester as Gordon Lonsdale |
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Margaret Tyzack as Elizabeth Gee |
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David Kossoff as Peter Kroger |
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Nancy Nevinson as Helen Kroger |
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Thorley Walters as Cmdr. Winters |
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Gillian Lewis as Marjorie Shaw |
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Newton Blick as P.O. Meadows |
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Philip Latham as Captain Ray |
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Cyril Chamberlain as Anderson |
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Justine Lord as Christina |
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Patrick Barr as Captain Warner |
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Derek Francis as Chief Supt. Croft |
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Hector Ross as Supt. Woods |
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Paul Eddington as Johnnie (uncredited) |
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Richard Marner as Colonel Monat (uncredited) |
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Geoffrey Palmer as Police Officer (uncredited) |
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Bryan Pringle as Surveillance Man (uncredited) |
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Andre Mikhelson as Russian Embassy Official (uncredited) |
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Garry Marsh as First Member at Lords (uncredited) |
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Basil Dignam as Second Member at Lords (uncredited) |
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Brian Nissen as Portland Official (uncredited) |
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Edwin Apps as Blake (uncredited) |
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Fred Griffiths as News Vendor (uncredited) |
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Anita West as Tilly (uncredited) |
| Directing | Robert Tronson | Director |
| Writing | Peter Barnes | Writer |
| Writing | Frank Launder | Writer |
| Production | Leslie Gilliat | Producer |
| Editing | Thelma Connell | Editor |
| Camera | Arthur Lavis | Director of Photography |
| Production | Paul Sheridan | Casting |
| Art | Norman G. Arnold | Art Direction |
| Camera | Jack Lowin | Camera Operator |
| Crew | Cecil Mason | Sound Recordist |
| Costume & Make-Up | Ernest Gasser | Makeup Artist |
| Costume & Make-Up | Daphne Vollmer | Hairdresser |
| Directing | Derek Cracknell | Assistant Director |
