帕德里夏·妮尔

Patricia Neal

饰：Helen Benson

迈克尔·伦尼

Michael Rennie

饰：克拉图 Klaatu,Carpenter

休·马洛威

Hugh Marlowe

饰：Tom Stevens

山姆·谢斐

Sam Jaffe

饰：Prof. Jacob Barnhardt

比利·格雷

Billy Gray

饰：Bobby Benson

豪利本

Holly Bane

饰：Army Captain (uncredited)

马歇尔·布拉德福德

Marshall Bradford

饰：Chief of Staff (uncredited)

约翰·伯顿

John Burton

饰：British radio MC (uncredited)

惠顿·钱伯斯

James Wheaton Chambers

饰：Mr. Bleeker (diamonds) (uncredited)

John Close

饰：Captain (uncredited)

James Craven

饰：Businessman (uncredited)

Jack Daly

饰：Bit Man (uncredited)

劳伦斯·多布金

Lawrence Dobkin

饰：Army physician (uncredited)

Charles Evans

Charles Evans

饰：Major general (uncredited)

伊迪丝·埃文森

Edith Evanson

饰：Mrs. Crockett (boarding house) (uncredited)

Elizabeth Flournoy

饰：Jewelry clerk (uncredited)

Harry Harvey Jr.

饰：Taxi driver (uncredited)

哈里·劳特

Harry Lauter

饰：Platoon leader (uncredited)

Freeman Lusk

饰：Gen. Cutler (uncredited)

George Lynn

饰：Col. Ryder (uncredited)

Herbert Lytton

饰：Brigadier General (uncredited)

Michael Mahoney

饰：Sentry (uncredited)

David McMahon

饰：Air Force sergeant (welder) (uncredited)

泰勒麦克维

Tyler McVey

饰：Brady (government agent) (uncredited)

米勒德·米切尔

Millard Mitchell

饰：Gen Cutler (uncredited)

霍华德·尼格利

Howard Negley

饰：Colonel (uncredited)

多萝西 纽曼

Dorothy Neumann

饰：Margaret (Tom's secretary) (uncredited)

Sammy Ogg

饰：Boy (uncredited)

Robert Osterloh

Robert Osterloh

饰：Army physician (uncredited)

小豪斯·彼得斯

House Peters Jr.

饰：MP captain (uncredited)

John M. Reed

饰：Tank Driver (uncredited)

费·鲁普

Fay Roope

饰：Major general (uncredited)

James Seay

饰：Government man (uncredited)

奥兰·索尔

Olan Soule

饰：Mr. Krull (boarder) (uncredited)

Harlan Warde

饰：Carson (uncredited)

斯图尔特·惠特曼

Stuart Whitman

饰：Army sentry (uncredited)

亚当·威廉姆斯

Adam Williams

饰：Army physician (uncredited)

Rush Williams

饰：MP sergeant (uncredited)

Carleton Young

饰：Colonel (uncredited)

富兰克林·法纳姆

Franklyn Farnum

饰：Extra in Office Building Corridor (uncredited)

山姆·哈里斯

Sam Harris

饰：Scientific Delegate (uncredited)

哈罗德·米勒

Harold Miller

饰：Military Officer at Pentagon Meeting (uncredited)

'Snub' Pollard

'Snub' Pollard

饰：Cab Driver (uncredited)

查尔斯·坦嫩

Charles Tannen

饰：Voice of Radio Announcer (uncredited)

弗朗西斯·巴维尔

Frances Bavier

饰：Mrs. Barley

Lock Martin

饰：Gort

H.V. Kaltenborn

饰：H.V. Kaltenborn

Elmer Davis

饰：Elmer Davis

Drew Pearson

饰：Drew Pearson

Gabriel Heatter

饰：Gabriel Heatter

约翰·布朗

John Brown

饰：George Barley (boarder) (uncredited)

弗兰克·康罗伊

Frank Parish Conroy

饰：Mr. Harley (President's secretary) (uncredited)

Eric Corrie

饰：British Soldier (uncredited)

John Costello

饰：Cockney (uncredited)

Marjorie Crossland

饰：Hilda (Barnhardt's secretary) (uncredited)

Jim Doyle

饰：A doctor (uncredited)

Grady Galloway

饰：American Radar Operator (uncredited)

Bill Gentry

饰：Sentry (uncredited)

Glenn Hardy

饰：Interviewer (uncredited)

Gil Herman

饰：Government agent (uncredited)

Hassan Khayyam

饰：Indian Radio Announcer (uncredited)

Gayle Pace

饰：Captain (uncredited)

Ted Pearson

饰：Colonel (uncredited)

Kim Spalding

饰：Army orderly (uncredited)

Harmon Stevens

饰：Bit Man (uncredited)

John Hiestand

饰：TV Announcer on Truck (uncredited)

萨姆·扎菲

Shalom Jaffe

饰：雅各布·巴恩哈特教授