Frank Sinatra character Capt./Maj. Bennett Marco
Laurence Harvey character Raymond Shaw
Angela Lansbury character Mrs. Iselin
James Gregory character Sen. John Yerkes Iselin
Janet Leigh character Eugenie Rose Chaney
Henry Silva character Chunjin
Leslie Parrish character Jocelyn Jordan
John McGiver character Sen. Thomas Jordan
Khigh Dhiegh character Dr. Yen Lo
James Edwards character Cpl. Allen Melvin
Douglas Henderson character Col. Milt
Albert Paulsen character Zilkov
Barry Kelley character Secretary of Defense
Lloyd Corrigan character Holborn Gaines
Madame Spivy character Female Berezovo
Bess Flowers character Woman in Dream Sequence
Leoda Richards character Woman at Press Confrence (uncredited)
Reggie Nalder character Gomel
Colin Kenny character Senator (uncredited)
Bert Stevens character Officer
Arthur Tovey character Second Reporter
Paul Frees character Narrator (voice)
Whit Bissell character Medical Officer
