Klaatu, alias Mr. Carpenter

Michael Rennie

Acting

Helen Benson

Patricia Neal

Acting

Bobby Benson

Billy Gray

Acting

Prof. Jacob Barnhardt

Sam Jaffe

Acting

Tom Stevens

Hugh Marlowe

Acting

Gort

Lock Martin

Acting

General Cutler

Freeman Lusk

Acting

Mrs. Crockett, landlady

Edith Evanson

Acting

Mr. Harley, Secretary to the President

Frank Conroy

Acting

Mrs. Barley, boarder

Frances Bavier

Acting

George Barley, boarder

John Brown

Acting

Mr. Krull, boarder

Olan Soule

Acting

Hilda, Barnhart's secretary

Marjorie Crossland

Acting

Elmer Davis

Elmer Davis

Acting

H. V. Kaltenborn

H.V. Kaltenborn

Acting

Drew Pearson

Drew Pearson

Acting

Gabriel Heatter (voice)

Gabriel Heatter

Acting

Lieutenant in Charge of Landing Site

Harry Lauter

Acting

Army Dr. White

James Doyle

Lighting

Balding Army Doctor

Larry Dobkin

Acting

Army Examining Doctor

Robert Osterloh

Acting

Radio Interviewer at Landing Site

Glenn Hardy

Acting

Brady

Tyler McVey

Acting

M.P. Captain at Barnhardt's

House Peters Jr.

Acting

Conference Colonel Ryder

George Lynn

Acting

Margaret, Tom's secretary

Dorothy Neumann

Acting

Mr. Bleeker, jeweller

Wheaton Chambers

Acting

Zone Five Lieutenant Colonel

Carleton Young

Acting

The Cab Driver

Harry Harvey

Acting

Sammy, boy witness

Sammy Ogg

Acting

Lady Outside Jewelry Store

Bess Flowers

Acting

Government Man

James Seay

Acting

Radar Operator

Grady Galloway

Acting

Indian Newscaster

Hassan Khayyam

Acting

British Newscaster

John Barton

Acting

Sentry (scene deleted)

Stuart Whitman

Acting

Scientific Delegate

Rama Bai

Acting

British Radio Announcer

John Burton

Acting

Radio Announcer (voice)

Bill Welsh

Acting