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)