一位外星人降临华盛顿特区，告知地球人类必须和平共处，否则将被作为对其他星球的威胁而遭毁灭。
Michael Rennie
Klaatu / Mr. Carpenter
Patricia Neal
Helen Benson
Billy Gray
Bobby Benson
Sam Jaffe
Prof. Jacob Barnhardt
Hugh Marlowe
Tom Stevens
Lock Martin
Gort
Freeman Lusk
General Cutler
Edith Evanson
Mrs. Crockett
Frank Conroy
Mr. Harley
Frances Bavier
Mrs. Barley
John Brown
George Barley
Olan Soule
Mr. Krull
Marjorie Crossland
Hilda
Elmer Davis
