Gary Cooper

Gideon Patch

Charlton Heston

John Sands

Michael Redgrave

Mr. Nyland

Virginia McKenna

Janet Taggart

Richard Harris

Higgins

Emlyn Williams

Sir Wilfred Falcett

Alexander Knox

Petrie

Cecil Parker

Inquiry Chairman

Ben Wright

Mike Duncan

Peter Illing

Gunderson

Terence de Marney

Ashley Cowan

Charles Davis

John Le Mesurier

Attorney

Noel Drayton

Charlie Bell

John Dearth

Reporter

Paul Bryar

Port Official (uncredited)

Albert Carrier

Ambulance Attendant (uncredited)

Louis Mercier

Commander of Police (uncredited)

Ron Nyman

Seaman (uncredited)

Lomax Study

Photographer (uncredited)