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