Gary Cooper

as Gideon Patch

Charlton Heston

as John Sands

Michael Redgrave

as Mr. Nyland

Virginia McKenna

as Janet Taggart

Richard Harris

as Higgins

Emlyn Williams

as Sir Wilfred Falcett

Alexander Knox

as Petrie

Cecil Parker

as Inquiry Chairman

Ben Wright

as Mike Duncan

Peter Illing

as Gunderson

Terence de Marney

Ashley Cowan

Charles Davis

John Le Mesurier

as Attorney

Noel Drayton

as Charlie Bell

John Dearth

as Reporter

Paul Bryar

as Port Official (uncredited)

Albert Carrier

as Ambulance Attendant (uncredited)

Louis Mercier

as Commander of Police (uncredited)

Ron Nyman

as Seaman (uncredited)

Lomax Study

as Photographer (uncredited)