George Formby
— George Hepplewhite
Phyllis Calvert
— Mary Wilson
Garry Marsh
— Mendez
Romney Brent
— Slim Selwyn
Bernard Lee
— Oscar
Coral Browne
— Iris
Helena Pickard
— Oscar's Wife
Percy Walsh
— Schwartz, Spy Chieftain
Diana Beaumont
— Greta, Hotel Receptionist
Torin Thatcher
— U-Boat Commander
Donald Calthrop
— Frederick Strickland
Hal Gordon
— Alf Arbuckle, Dinky Do
Johnnie Schofield
— Solicitous Steward
Daniel Brown
— Baker (uncredited)
Alec Clunes
— Officer (uncredited)
Walter Fitzgerald
— Dockside Policeman (uncredited)
Ian Fleming
— Col. Harcourt (uncredited)
Jack Hobbs
— Conway (uncredited)
James Knight
— Passenger On SS Macaulay (uncredited)
Albert Lieven
— German Radio Operator (uncredited)
Charles Paton
— Simion (uncredited)
Lloyd Pearson
— Hotel Manager (uncredited)
Bill Shine
— Untipped Steward (uncredited)
Ronald Shiner
— Musician (uncredited)
Ben Williams
— Radio Operator On SS Macaulay (uncredited)
Ian Wilson
— Parker, Dinky Do (uncredited)