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George Cole as George Archibald Potts |
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Oskar Homolka as Zekov |
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Nadia Gray as Tania |
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Wilfrid Hyde-White as Sir Hubert Wells |
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Richard Wattis as Barnes |
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Irene Handl as Mrs. Tidmarsh |
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Christopher Lee as Russian Agent (uncredited) |
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Frederick Leister as Prime Minister |
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Frederick Valk as Rakov |
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Geoffrey Sumner as Pike |
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Ronald Adam as Barworth Controller |
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Edwin Styles as Barworth Superintendent |
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Kynaston Reeves as Barworth Director |
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Ernest Jay as Professor Layton |
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Michael Medwin as Smedley |
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Henry Hewitt as Minister of Health |
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Walter Horsbrugh as 1st Cabinet Minister |
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Anthony Shaw as 2nd Cabinet Minister |
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Tim Turner as 1st Reporter |
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Gibb McLaughlin as Schoolmaster |
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Michael Balfour as Jersey Sailor |
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Hal Osmond as Jersey Waiter |
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Charles Goldner as Gaston |
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Ronnie Stevens as Aubrey |
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Eleanor Summerfield as Cecilia |
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Phyllis Morris as Mrs. Tweedy |
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Myrtle Reed as Jersey Air Hostess |
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Ina De La Haye as Madame |
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David Hurst as Deutsch |
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Bernard Rebel as Trubiev |
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Olaf Pooley as Roblettski |
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Guido Lorraine as 1st M.V.D. |
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Terence Alexander as 2nd M.V.D. |
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Richard Marner as Russian Sentry |
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Martin Boddey as Russian Security Officer |
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Gerard Heinz as Russian Director of Plant |
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Fred Berger as Russian Doctor |
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Victor Maddern as British N.C.O. |
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Reed De Rouen as 1st U.S. Soldier |
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Johnny Catcher as 2nd U.S. Soldier |
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Willoughby Gray as British Officer |
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Anton Diffring as Border Police GDR (uncredited) |
| Directing | Mario Zampi | Director |
| Writing | Michael Pertwee | Screenplay |
| Writing | Jack Davies | Screenplay |
| Sound | Stanley Black | Original Music Composer |
| Camera | Stanley Pavey | Director of Photography |
| Art | Ivan King | Art Direction |
| Editing | Giulio Zampi | Editor |
| Production | Mario Zampi | Producer |
