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Michael Rennie

Klaatu / Mr. Carpenter

Patricia Neal

Helen Benson

Billy Gray

Bobby Benson

Sam Jaffe

Prof. Jacob Barnhardt

Hugh Marlowe

Tom Stevens

Lock Martin

Gort

Freeman Lusk

General Cutler

Edith Evanson

Mrs. Crockett

Frank Conroy

Mr. Harley

Frances Bavier

Mrs. Barley

John Brown

George Barley

Olan Soule

Mr. Krull

Marjorie Crossland

Hilda

Elmer Davis

Elmer Davis

H.V. Kaltenborn

H. V. Kaltenborn

Drew Pearson

Drew Pearson

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

Tyler McVey

Brady

House Peters Jr.

M.P. Captain at Barnhardt's