 Terence MorganInspector Ralph Brown | Inspector Ralph Brown |
 Yolande DonlanJill Wilson | Jill Wilson |
| AAnthony OliverInspector Newcombe | Inspector Newcombe |
 André MorellRobert Isaac Pitt | Robert Isaac Pitt |
 Reginald BeckwithHarold | Harold |
| UUrsula HowellsAntonia Pitt | Antonia Pitt |
 Guido LorrainePietr Revski | Pietr Revski |
 Basil DignamWing Commander Riddle | Wing Commander Riddle |
| RRaymond RollettSir Robert Rosper | Sir Robert Rosper |
 Fred JohnsonProfessor Robinson-Heston | Professor Robinson-Heston |
 Arnold MarléKarl Kopek | Karl Kopek |
 Mark DignamPrison Governor | Prison Governor |
 John HorsleyAssistant Commissioner | Assistant Commissioner |
| BBarry LoweEric Colter | Eric Colter |
| DDiana LambertYoung Woman | Young Woman |
| PPetra DaviesPitt's Maid (uncredited) | Pitt's Maid (uncredited) |
 Brown DerbyPolice Sergeant (uncredited) | Police Sergeant (uncredited) |
| MMichael GodfreyChertwell Security Guard (uncredited) | Chertwell Security Guard (uncredited) |
| AArthur LovegroveNick (uncredited) | Nick (uncredited) |
| LLouis MattoWaiter (uncredited) | Waiter (uncredited) |
| GGuy MillsBrown's Driver (uncredited) | Brown's Driver (uncredited) |
| SStuart MitchellHead Waiter (uncredited) | Head Waiter (uncredited) |
 Jim BradyNick's Thug (uncredited) | Nick's Thug (uncredited) |
| CCyril RenisonDetective Sergeant Enders (uncredited) | Detective Sergeant Enders (uncredited) |
