Eric Portman
— Arthur Lawrence
Ann Dvorak
— Joan Grahame
Karl Stepanek
— Franz von Brinkman
Ronald Ward
— Rupert Chessman
Ronald Adam
— George Merrick
Felix Aylmer
— Sir Alfred Horton
Brefni O'Rorke
— Security Officer
A.E. Matthews
— Sir Thomas Leighton
Ivor Barnard
— Henry Waud
David Peel
— Lt. Peter Leighton
Charles Victor
— Petty Officer Flanagan
George Merritt
— Works Manager
Marjorie Rhodes
— Mrs. Pickles
John Ruddock
— Jim
Frederick Cooper
— Gösta
Lily Kann
— Karin Möller
Richard George
— Admiral of Operations
James Pirrie
— Reporter
Doyley John
— Lt. Commander
Norman Whitcomb
— Brinkmann's Secretary