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Oliver Reed as Ivan Dragomiloff |
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Diana Rigg as Sonya Winter |
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Telly Savalas as Lord Bostwick |
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Curd Jürgens as General von Pinck |
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Philippe Noiret as Monsieur Lucoville |
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Warren Mitchell as Herr Weiss |
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Beryl Reid as Madame Otero |
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Clive Revill as Cesare Spado |
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Kenneth Griffith as Monsieur Popescu |
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Vernon Dobtcheff as Baron Muntzof |
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Annabella Incontrera as Eleanora Spado |
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Jess Conrad as Angelo |
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George Coulouris as Swiss Peasant |
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Ralph Michael as Editor |
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Katherine Kath as Mme. Lucoville |
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Eugene Deckers as 'La Belle Amie' desk clerk |
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Olaf Pooley as Swiss Cashier |
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George Murcell as Zeppelin pilot |
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Michael Wolf as Zeppelin officer |
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Gordon Sterne as Corporal |
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Peter Bowles as Jealous lover at 'La Belle Amie' (uncredited) |
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William Kendall as M. Marivaux at 'La Belle Amie' |
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Jeremy Lloyd as English Officer |
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Roger Delgado as Bureau Member (uncredited) |
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Maurice Browning as Bureau Member |
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Clive Cazes as Bureau Member |
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Milton Reid as Circus victim Leonardi |
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Frank Thornton as Elevator victim (uncredited) |
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Nita Lorraine as 'La Belle Amie' Girl |
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Michael Mellinger as Venetian Police Officer (uncredited) |
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Philip Madoc as German Officer |
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Kevin Stoney as Blind Man |
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Lockwood West as Hatter |
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Rosalind Elliot as Blind hatmaker (Uncredited) |
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John Abineri as Police Inspector (uncredited) |
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Anthony Dawes as Assistant Editor (uncredited) |
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Harry Fielder as Soldier (uncredited) |
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Michael Gover as Venice Hotel Manager (uncredited) |
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Peter Graves as Dragomiloff's Butler (uncredited) |
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John Hallam as Bureau Member (uncredited) |
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John G. Heller as von Pinck's Aide (uncredited) |
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Alastair Hunter as Exp!oding Casket Victim (uncredited) |
| Directing | Basil Dearden | Director |
| Writing | Robert L. Fish | Novel |
| Writing | Jack London | Novel |
| Writing | Michael Relph | Writer |
| Crew | Vic Armstrong | Stunts |
| Directing | Susan Dyson | Continuity |
| Production | Michael Relph | Producer |
| Production | Charles Orme | Associate Producer |
| Sound | Ron Grainer | Music |
| Editing | Teddy Darvas | Editor |
| Production | Weston Drury Jr. | Casting |
| Art | Michael Relph | Production Design |
| Camera | Geoffrey Unsworth | Director of Photography |
| Art | Roy Forge Smith | Art Direction |
| Art | Frank White | Art Direction |
| Costume & Make-Up | Beatrice Dawson | Costume Design |
| Costume & Make-Up | Harry Frampton | Makeup Artist |
| Costume & Make-Up | Barbara Ritchie | Hairstylist |
| Production | Barrie Melrose | Production Manager |
| Directing | John Peverall | Assistant Director |
| Sound | John Poyner | Sound Editor |
| Sound | Ken Barker | Sound Recordist |
| Sound | John Dennis | Sound Recordist |
| Sound | Dudley Messenger | Sound Recordist |
| Camera | Peter MacDonald | Camera Operator |
| Camera | George Courtney Ward | Still Photographer |
| Costume & Make-Up | Rosemary Burrows | Wardrobe Supervisor |
| Costume & Make-Up | John Hilling | Wardrobe Supervisor |
| Art | Oliver Streeton | Draughtsman |