- Clifton Webb
- Lt. Cmdr. Ewen Montagu
- Gloria Grahame
- Lucy Sherwood
- Robert Flemyng
- Lt. George Acres
- Josephine Griffin
- Pam
- Stephen Boyd
- Patrick O'Reilly
- Laurence Naismith
- Adm. Cross
- Geoffrey Keen
- Gen. Nye
- Moultrie Kelsall
- The Father
- Cyril Cusack
- Taxi Driver
- André Morell
- Sir Bernard Spilsbury
- Michael Hordern
- Gen. Cockburn
- Allan Cuthbertson
- Vice-Admiral
- Joan Hickson
- Landlady
- Terence Longdon
- Larry
- Gibb McLaughlin
- Club Porter
- Miles Malleson
- Scientist
- William Russell
- Joe
- William Squire
- Lt. Jewell
- Richard Wattis
- Shop Assistant
- Ronald Adam
- Adams
- William Baskiville
- M15 Agent
- Gordon Bell
- Customs Officer
- Nigel Bernard
- MI5 Agent
- Michael Brill
- Doctor
- Robert Brown
- French
- D.A. Clarke-Smith
- Consul Laurence
- Bill Cummings
- Submariner
- Carl Duering
- German Agent
- Wolf Frees
- Adm. Canaris
- Everley Gregg
- Club Matron
- Patrick Halpin
- American Officer
- Lloyd Lamble
- Passport Officer
- Ewen Montagu
- Air Marshal
- Brian Oulton
- Wills Officer
- Cicely Paget-Bowman
- Secretary
- Michael Peake
- Sailor on Submarine
- Gerhard Puritz
- German Colonel
- François Périer
- Clerk of British Embassy
- Peter Sellers
- Winston Churchill
- John Welsh
- Bank Manager
- Peter Williams
- Adm. Mountbatten
