Humphrey Bogart Billy Dannreuther Jennifer Jones Gwendolen Chelm Gina Lollobrigida Maria Dannreuther Robert Morley Peterson Peter Lorre Julius O'Hara Edward Underdown Harry Chelm Ivor Barnard Maj. Jack Ross Marco Tulli Ravello Bernard Lee Insp. Jack Clayton Mario Perrone Purser on SS Nyanga Giulio Donnini Administrator Saro Urzì Captain of SS Nyanga Juan de Landa Hispano-Suiza Driver Aldo Silvani Charles Mimmo Poli Barman (uncredited) Peter Sellers Billy Dannreuther (voice) (uncredited) Manuel Serrano Ahmed (uncredited) Oswald Morris Director John Huston Director Robert Sterne Director Jeanie Sims Director John Arnold Director