Frank Sinatra as Capt./Maj. Bennett Marco

Laurence Harvey as Raymond Shaw

Angela Lansbury as Mrs. Iselin

Janet Leigh as Eugenie Rose Chaney

James Gregory as Sen. John Yerkes Iselin

Henry Silva as Chunjin

Leslie Parrish as Jocelyn Jordan

John McGiver as Sen. Thomas Jordan

Khigh Dhiegh as Dr. Yen Lo

James Edwards as Cpl. Allen Melvin

Douglas Henderson as Col. Milt

Albert Paulsen as Zilkov

Barry Kelley as Secretary of Defense

Lloyd Corrigan as Holborn Gaines

Madame Spivy as Female Berezovo

Bess Flowers as Gomel's Lady Counterpart (uncredited)

Leoda Richards as Woman at Press Confrence (uncredited)

Reggie Nalder as Gomel (uncredited)

Colin Kenny as Senator (uncredited)

Bert Stevens as Officer

Arthur Tovey as Second Reporter

Paul Frees as Narrator (voice)

Whit Bissell as Medical Officer

James Yagi as Chinese Officer (uncredited)

Tom Lowell as Pvt. Bobby Lembeck (uncredited)

Joe Adams as Psychiatrist

Merritt Bohn as Jilly

Robert Riordan as Benjamin K. Arthur

Raoul Freeman as Reporter (uncredited)

Rudy Germane as Delegate (uncredited)

Herschel Graham as Delegate (uncredited)

Stuart Hall as Reporter (uncredited)