Klaatu, alias Mr. Carpenter
Michael Rennie
Helen Benson
Patricia Neal
George Barley, boarder
John Brown
Mr. Krull, boarder
Olan Soule
Hilda, Barnhart's secretary
Marjorie Crossland
Elmer Davis
H. V. Kaltenborn
H.V. Kaltenborn
Drew Pearson
Gabriel Heatter (voice)
Gabriel Heatter
Lieutenant in Charge of Landing Site
Harry Lauter
Army Dr. White
James Doyle
Balding Army Doctor
Larry Dobkin
Bobby Benson
Billy Gray
Army Examining Doctor
Robert Osterloh
Radio Interviewer at Landing Site
Glenn Hardy
Brady
Tyler McVey
M.P. Captain at Barnhardt's
House Peters Jr.
Conference Colonel Ryder
George Lynn
Margaret, Tom's secretary
Dorothy Neumann
Mr. Bleeker, jeweller
Wheaton Chambers
Zone Five Lieutenant Colonel
Carleton Young
The Cab Driver
Harry Harvey
Sammy, boy witness
Sammy Ogg
Prof. Jacob Barnhardt
Sam Jaffe
Lady Outside Jewelry Store
Bess Flowers
Government Man
James Seay
Radar Operator
Grady Galloway
Indian Newscaster
Hassan Khayyam
British Newscaster
John Barton
Sentry (scene deleted)
Stuart Whitman
Scientific Delegate
Rama Bai
British Radio Announcer
John Burton
Radio Announcer (voice)
Bill Welsh
Tom Stevens
Hugh Marlowe
Gort
Lock Martin
General Cutler
Freeman Lusk
Mrs. Crockett, landlady
Edith Evanson
Mr. Harley, Secretary to the President
Frank Conroy
Mrs. Barley, boarder
Frances Bavier
Costume Design
Travilla
Original Music Composer
Bernard Herrmann
Director
Robert Wise
Screenplay
Edmund H. North
Makeup Artist
Ben Nye
Art Direction
Addison Hehr
Set Decoration
Thomas Little
Perkins Bailey
Producer
Julian Blaustein
Director of Photography
Leo Tover
Editor
William Reynolds
Claude E. Carpenter
Lyle R. Wheeler
Special Effects
Fred Sersen
Wardrobe Master
Charles LeMaire
Original Story
Harry Bates