Claude Hulbert
— Llewellyn Davies, 'The Admiral'
Michael Wilding
— Johnny
Carla Lehmann
— Jane
Tommy Trinder
— Tommy Taylor
Jeanne De Casalis
— Mrs. Pilkington
Henry Hewitt
— Prof. Pilkington
John Laurie
— McNab
James Hayter
— Hans
Brian Fitzpatrick
— Digby
Harold Warrender
— Pilot's Mate
Eric Clavering
— Bartender
John Glyn-Jones
— Best Man
Julian Vedey
— Resident of Tangier
John Wengraf
— German Captain
Manning Whiley
— German Commdr.
Victor Fairley
— German Petty Officer
Robert Rendel
— British Captain
Allan Jeayes
— British Commdr.
Alec Clunes
— British Pilot
Derek Elphinstone
— British Observer
Jonny Bloor
— Minor Role (uncredited)
Harold Coyne
— Sailor (uncredited)
E. V. H. Emmett
— Newsreel Commentator (voice)
Danny Green
— Nightclub Bouncer (uncredited)
Bryan Herbert
— Petty Officer on HMS Ferocious (uncredited)
Olaf Olsen
— Minor Role (uncredited)
Tao Porchon
— Minor Role (uncredited)
Johnnie Schofield
— Officer Reading Heliograph Message (uncredited)