Otto Kruger
— Dr. Jan Stockman
Elissa Landi
— Dr. Royce Lee Stockman
Donald Woods
— Dr. Michael
Frank Jenks
— Sgt. Mahoney
Rick Vallin
— Cpl. Pinky Mason
Wanda McKay
— Nurse Jane 'Hey-Dutch' Van Dornen
Ian Keith
— Capt. Morris
Ted Hecht
— Platoon Lieutenant
Charles Jordan
— Bronx
Frank Jaquet
— Priest
I. Stanford Jolley
— Agitated Soldier at Barricade
John Grant
— Calm Soldier at Barricade
Ruby Dandridge
— Hyacinth
Alfred Noyes
— Epilogue Narrator (voice)
Ted Adams
— Ordnance Officer
Frank Hagney
— Lieutenant #2
Eddie Hall
— Brooklyn
Gordon Hayes
— Marine
Jack Rutherford
— General
Forrest Taylor
— Doctor
Jimmy Vilan
— Stockman's Houseboy