Robert Newton

as Capt. David Grant

Raymond Lovell

as Paul Faber

Guy Middleton

as Capt. Tony Hunter

Muriel Pavlow

as Marion Decker

Herbert Lom

as Keitel

John Ruddock

as Bowman

Martin Miller

as Professor Hansen

Brenda Bruce

as Lily Leggett

Gerald Case

as Inspector Emerson

Scott Forbes

as Lieut. Allen (as Julian Dallas)

Leslie Dwyer

as George Leggett

Valentine Dyall

as Sir George Bell

Derek Elphinstone

as Naval Surgeon

Bruce Gordon

as Hood

Marius Goring

as Frederick Jannings

George Hirste

as Station Official

Hubert Leslie

as Ticket Collector

Olga Lindo

as Mrs. Coleman

Stuart Lindsell

as Inspector Martin

Gordon McLeod

as Inspector Longhurst

Joan Maude

as Sidney Vane

Lawrence O'Madden

as Captain Robert Wilson

Hay Petrie

as Station Master

Wilfrid Hyde-White

as Taxi Driver

Howard Douglas

as Hotel Porter (uncredited)

Johnnie Schofield

as Factory Watchman (uncredited)

John Stone

as Young Newlywed (uncredited)