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Laurence Harvey as Dr. Francis Trevelyan |
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Daliah Lavi as Princess Natasha Romanova |
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Lionel Jeffries as Stanley Farquhar |
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Eric Sykes as Wrigley |
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Eric Portman as British Ambassador |
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Denholm Elliott as Pond-Jones |
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Wanda Ventham as Mrs. Winters |
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Marianne Stone as Mrs. Whitby |
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June Whitfield as Elsie Farquhar |
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Colin Blakely as Russian Prime Minister |
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Robert Flemyng as M.I.5 Director |
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Bernard Archard as Russian Intelligence Chief |
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Paul Ford as American General |
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Michael Trubshawe as Braithwaite |
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Amy Dalby as Miss Marchbanks |
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John Forbes-Robertson as M.I.5 Workshop Director |
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R.S.M. Brittain as Commissionaire |
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Peter Bayliss as Professor |
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Barry Cryer as Harold Wilson (voice) |
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Renée Houston as Lady Blanchflower |
| Writing | Alan Simpson | Writer |
| Directing | Daniel Petrie | Director |
| Writing | Ray Galton | Writer |
| Production | Joseph E. Levine | Executive Producer |
| Art | Peter Mullins | Art Direction |
| Production | Leonard Lightstone | Producer |
| Production | Robert Porter | Associate Producer |
| Camera | Kenneth Higgins | Director of Photography |
| Sound | Riz Ortolani | Music |
| Art | Richard Williams | Title Designer |
| Costume & Make-Up | Yvonne Blake | Costume Design |
| Editing | Jack Slade | Editor |
