Michael Rennie
Klaatu, alias Mr. Carpenter
Acting
Patricia Neal
Helen Benson
Acting
Billy Gray
Bobby Benson
Acting
Sam Jaffe
Prof. Jacob Barnhardt
Acting
Hugh Marlowe
Tom Stevens
Acting
Lock Martin
Gort
Acting
Freeman Lusk
General Cutler
Acting
Edith Evanson
Mrs. Crockett, landlady
Acting
Frank Conroy
Mr. Harley, Secretary to the President
Acting
Frances Bavier
Mrs. Barley, boarder
Acting
John Brown
George Barley, boarder
Acting
Olan Soule
Mr. Krull, boarder
Acting
Marjorie Crossland
Hilda, Barnhart's secretary
Acting
Elmer Davis
Elmer Davis
Acting
H.V. Kaltenborn
H. V. Kaltenborn
Acting
Drew Pearson
Drew Pearson
Acting
Gabriel Heatter
Gabriel Heatter (voice)
Acting
Harry Lauter
Lieutenant in Charge of Landing Site
Acting
James Doyle
Army Dr. White
Lighting
Larry Dobkin
Balding Army Doctor
Acting
Robert Osterloh
Army Examining Doctor
Acting
Glenn Hardy
Radio Interviewer at Landing Site
Acting
Tyler McVey
Brady
Acting
House Peters Jr.
M.P. Captain at Barnhardt's
Acting
George Lynn
Conference Colonel Ryder
Acting
Dorothy Neumann
Margaret, Tom's secretary
Acting
Wheaton Chambers
Mr. Bleeker, jeweller
Acting
Carleton Young
Zone Five Lieutenant Colonel
Acting
Harry Harvey
The Cab Driver
Acting
Sammy Ogg
Sammy, boy witness
Acting
Bess Flowers
Lady Outside Jewelry Store
Acting
James Seay
Government Man
Acting
Grady Galloway
Radar Operator
Acting
Hassan Khayyam
Indian Newscaster
Acting
John Barton
British Newscaster
Acting
Stuart Whitman
Sentry (scene deleted)
Acting
Rama Bai
Scientific Delegate
Acting
John Burton
British Radio Announcer
Acting
Bill Welsh
Radio Announcer (voice)
Acting