Casts
Alec Guinness
as Professor Marcus
Cecil Parker
as Claude, alias 'Major Courtney'
Herbert Lom
as Louis, alias 'Mr. Harvey'
Peter Sellers
as Harry, alias 'Mr. Robinson'
Danny Green
as 'One-Round', alias 'Mr. Lawson'
Katie Johnson
as Mrs. Wilberforce
Jack Warner
as The Superintendent
Philip Stainton
as The Sergeant
Frankie Howerd
as The Barrow Boy
Kenneth Connor
as Cab Driver (uncredited)
