From out of space...A warning and an ultimatum.
An alien and a robot land on Earth after World War II and tell mankind to be peaceful or face destruction.
Klaatu, alias Mr. Carpenter
Helen Benson
Bobby Benson
Prof. Jacob Barnhardt
Tom Stevens
Gort
General Cutler
Mrs. Crockett, landlady
Mr. Harley, Secretary to the President
Mrs. Barley, boarder
George Barley, boarder
Mr. Krull, boarder