Ray Milland
— Wing Commander Rudge
Bernard Lee
— Flight Sergeant Harris
Kenneth Haigh
— Anthony 'Tony' Winchester
Kenneth Fortescue
— John Fletcher
Sean Kelly
— Cadet Day
Helen Cherry
— Louise Dawson
Anthony Newley
— Roger Endicott
Leslie Phillips
— Blake
John Le Mesurier
— Commandant
Richard Wattis
— Wilson
Kynaston Reeves
— Air Minister
Richard Bennett
— Cadet Phillips
Jan Brooks
— Diana
M.E. Clifton James
— Field Marshal Montgomery (uncredited)