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