Alec Guinness в ролята на Professor Marcus
Cecil Parker в ролята на Claude, alias 'Major Courtney'
Herbert Lom в ролята на Louis, alias 'Mr. Harvey'
Peter Sellers в ролята на Harry, alias 'Mr. Robinson'
Danny Green в ролята на 'One-Round', alias 'Mr. Lawson'
Katie Johnson в ролята на Mrs. Wilberforce
Jack Warner в ролята на The Superintendent
Philip Stainton в ролята на The Sergeant
Frankie Howerd в ролята на The Barrow Boy
Madge Brindley в ролята на Large Lady (uncredited)
Hélène Burls в ролята на Hypatia (uncredited)
Kenneth Connor в ролята на Cab Driver (uncredited)
Michael Corcoran в ролята на Burglar (uncredited)
Harold Goodwin в ролята на Parcels Clerk (uncredited)
Fred Griffiths в ролята на Junk Man (uncredited)
Lucy Griffiths в ролята на Miss Pringle (uncredited)
George Hilsdon в ролята на Security Van Driver (uncredited)
Vincent Holman в ролята на Station Master (uncredited)
Stratford Johns в ролята на Security Guard (uncredited)
Sam Kydd в ролята на Second Cab Driver (uncredited)
Edie Martin в ролята на Lettice (uncredited)
Jack Melford в ролята на Detective (uncredited)
Arthur Mullard в ролята на (uncredited)
Ewan Roberts в ролята на Constable (uncredited)
George Roderick в ролята на Radio Car Policeman (uncredited)
John Rudling в ролята на Nervous Man (uncredited)
Leonard Sharp в ролята на Pavement Artist (uncredited)
Peter Williams в ролята на Detective at Parcels Office (uncredited)
Neil Wilson в ролята на Policeman (uncredited)
