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
Hilda, Barnhart's secretary
Elmer Davis
H. V. Kaltenborn
Drew Pearson
Gabriel Heatter (voice)
Lieutenant in Charge of Landing Site
Army Dr. White
Balding Army Doctor
Army Examining Doctor
Radio Interviewer at Landing Site
Brady
M.P. Captain at Barnhardt's
