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Terence Morgan as Inspector Ralph Brown |
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Yolande Donlan as Jill Wilson |
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Anthony Oliver as Inspector Newcombe |
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André Morell as Robert Isaac Pitt |
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Reginald Beckwith as Harold |
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Ursula Howells as Antonia Pitt |
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Guido Lorraine as Pietr Revski |
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Basil Dignam as Wing Commander Riddle |
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Raymond Rollett as Sir Robert Rosper |
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Fred Johnson as Professor Robinson-Heston |
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Arnold Marlé as Karl Kopek |
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Mark Dignam as Prison Governor |
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John Horsley as Assistant Commissioner |
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Barry Lowe as Eric Colter |
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Diana Lambert as Young Woman |
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Petra Davies as Pitt's Maid (uncredited) |
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Brown Derby as Police Sergeant (uncredited) |
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Michael Godfrey as Chertwell Security Guard (uncredited) |
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Arthur Lovegrove as Nick (uncredited) |
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Louis Matto as Waiter (uncredited) |
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Guy Mills as Brown's Driver (uncredited) |
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Stuart Mitchell as Head Waiter (uncredited) |
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Jim Brady as Nick's Thug (uncredited) |
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Cyril Renison as Detective Sergeant Enders (uncredited) |
| Writing | Leonard Mosley | Novel |
| Writing | Val Guest | Screenplay |
| Writing | Val Valentine | Screenplay |
| Directing | Val Guest | Director |
| Camera | Bernard Lewis | Camera Operator |
