Cast
Alec GuinnessProfessor Marcus
Cecil ParkerClaude, alias 'Major Courtney'
Herbert LomLouis, alias 'Mr. Harvey'
Peter SellersHarry, alias 'Mr. Robinson'
Danny Green'One-Round', alias 'Mr. Lawson'
Katie JohnsonMrs. Wilberforce
Jack WarnerThe Superintendent
Philip StaintonThe Sergeant- Frankie HowerdThe Barrow Boy
- Madge BrindleyLarge Lady (uncredited)
- Hélène BurlsHypatia (uncredited)
Kenneth ConnorCab Driver (uncredited)- Michael CorcoranBurglar (uncredited)
Harold GoodwinParcels Clerk (uncredited)
Fred GriffithsJunk Man (uncredited)
