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