Cast 30

1. 

   Alec Guinness

   Professor Marcus

2. 

   Cecil Parker

   Claude, alias 'Major Courtney'

3. 

   Herbert Lom

   Louis, alias 'Mr. Harvey'

4. 

   Peter Sellers

   Harry, alias 'Mr. Robinson'

5. 

   Danny Green

   'One-Round', alias 'Mr. Lawson'

6. 

   Katie Johnson

   Mrs. Wilberforce

7. 

   Jack Warner

   The Superintendent

8. 

   Philip Stainton

   The Sergeant

9. 

   Frankie Howerd

   The Barrow Boy

10. Madge Brindley

    Large Lady (uncredited)

11. Hélène Burls

    Hypatia (uncredited)

12. 

    Kenneth Connor

    Cab Driver (uncredited)

13. Michael Corcoran

    Burglar (uncredited)

14. 

    Harold Goodwin

    Parcels Clerk (uncredited)

15. Fred Griffiths

    Junk Man (uncredited)

16. 

    Lucy Griffiths

    Miss Pringle (uncredited)

17. George Hilsdon

    Security Van Driver (uncredited)

18. Vincent Holman

    Station Master (uncredited)

19. 

    Stratford Johns

    Security Guard (uncredited)

20. 

    Sam Kydd

    Second Cab Driver (uncredited)

21. 

    Edie Martin

    Lettice (uncredited)

22. Jack Melford

    Detective (uncredited)

23. 

    Arthur Mullard

    (uncredited)

24. 

    Ewan Roberts

    Constable (uncredited)

25. George Roderick

    Radio Car Policeman (uncredited)

26. John Rudling

    Nervous Man (uncredited)

27. Leonard Sharp

    Pavement Artist (uncredited)

28. Peter Williams

    Detective at Parcels Office (uncredited)

29. 

    Neil Wilson

    Policeman (uncredited)

30. Phoebe Hodgson

    Constance (uncredited)

Crew 34