Ralph Richardson as Maj. Charles Hammond

Laurence Olivier as Tony McVane

Valerie Hobson as Kay Lawrence

George Merritt as Mr. Barrett

George Curzon as Jenkins

Roy Emerton as Viking First Mate

Frank Fox as Karl

Gus McNaughton as Blenkinsop, Hammond's Butler

George Butler as Air Marshal Gosport

Gordon McLeod as The Baron

Hay Petrie as Stage Door Keeper

Sandra Storme as Daphne

David Tree as R. Mackenzie

John Longden as John Peters, a Pilot

Ronald Adam as Pollack - Aviation Engineer

Patrick Aherne as Officer

Mark Daly as John - Factory Watchman

David Farrar as Viking Bo'sun

Ian Fleming as Air Ministry Officer

Franklin Kelsey as Inspector

John Laurie as Newspaper Editor

Herbert Lomas as Mattie - Fisherman

Raymond Lovell as Northern Salvage Company Manager

Gertrude Musgrove as Barmaid

Reginald Purdell as Pilot

John Robinson as Pilot

John Singer as Newspaper Boy

Lewis Stringer as Foreign Agent

Jack Vyvyan as Police Sgt

Hal Walters as Cornish Car Driver

Eileen Bennett as Minor Role

Leslie Bradley as Minor Role

Henry Caine as Minor Role

Derek Farr as Minor Role

Morland Graham as Minor Role

Sally Gray as Minor Role

Allan Jeayes as Minor Role

Colin Keith-Johnston as Minor Role

Gregory Stroud as Minor Role

Miles Malleson as Minor Role