Pastor Matthew Collins

Lewis Martin

Dr. Clayton Forrester

Gene Barry

Francis X. Bushman

Sylvia Van Buren

Ann Robinson

Dwight Mead

Dr. Pryor

Robert Cornthwaite

Dr. Bilderbeck

Sandro Giglio

Maj. Gen. Mann

Les Tremayne

Alonzo Hogue

Paul Birch

Fiddler Hawkins (uncredited)

Frank Kreig

Col. Ralph Heffner

Vernon Rich

Salvatore

Jack Kruschen

Wash Perry

Bill Phipps

General's Aide

Houseley Stevenson Jr.

Dr. Duprey (uncredited)

Ann Codee

Radio Announcer

Paul Frees

Commentary (voice) (as Sir Cedric Hardwicke)

Cedric Hardwicke

Cop

Henry Brandon

Bird-Brained Blonde

Carolyn Jones

Man

Pierre Cressoy

Man

John Mansfield

Man

Eric Alden

Pine Summit Fire Watcher (uncredited)

Peter Adams

Young Wife

Nancy Hale

Brigadier General (uncredited)

Hugh Allen

Girl

Virginia Hall

Mother (uncredited)

Ruth Barnell

Girl

Patricia Iannone

Sheriff Bogany

Walter Sande

Prof. McPherson (uncredited)

Edgar Barrier

Martian

Charles Gemora

Dr. Carmichael (uncredited)

Russ Bender

Dr. Hettinger

Alex Frazer

Man in Church (uncredited)

Oscar Blank

Man in Church (uncredited)

Nick Borgani

Screaming Woman (uncredited)

Hazel Boyne

Dr. Gratzman

Ivan Lebedeff

Man in Church (uncredited)

Chet Brandenburg

Soldier (uncredited)

George Bruggeman

Ranger

Robert Rockwell

Zippy

Alvy Moore

Woman in Church (uncredited)

Nora Bush

Boy in Final Church (uncredited)

Tony Butala

Burning Soldier at Pit (uncredited)

Mushy Callahan

Doctor

John Maxwell

Looter (uncredited)

Dick Cherney

Well-dressed Man During Looting

Ned Glass

Spanish Priest (uncredited)

Edward Colmans

Man at Pacific Institute of Science and Technology (uncredited)

James Conaty

Australian Policeman

Cliff Clark

Rev. Bethany (uncredited)

Russ Conway

Marine Sergeant (uncredited)

Martin Coulter

Deacon

Jamesson Shade

Minister

David McMahon

First Radio Reporter (uncredited)

Vittorio Cramer

News Vendor

Gertrude W. Hoffman

Secretary of Defense

Freeman Lusk

Scientist (uncredited)

Oliver Cross

Woman in Church (uncredited)

Jane Crowley

Colonel

Don Kohler

Fire Chief

Sydney Mason

Marine Commanding Officer (uncredited)

Jim Davies

Woman in Church (uncredited)

Helen Dickson

KGEB Reporter

Ted Hecht

Buck Monahan (uncredited)

Ralph Dumke

Civil Defense Official (uncredited)

Jimmie Dundee

Japanese Diplomat

Teru Shimada

Chief of Staff

Herbert Lytton

Police Chief (uncredited)

Al Ferguson

Marine Captain (uncredited)

Dick Fortune

Bum #2 Listening to Radio (uncredited)

Frank Freeman Jr.

Reporter

Wally Richard

Reporter

Morton C. Thompson

Radio Listener (uncredited)

Slim Gaut

Reporter

Jerry James

Red Cross Leader

Ralph Montgomery

Man in Church (uncredited)

Jack Gordon

Staff Sergeant

Douglas Henderson

Looter (uncredited)

Fred Graham

Looter (uncredited)

Joe Gray

MP Driver

Anthony Warde

Big Man

Bud Wolfe

Worker Listening to Radio (uncredited)

Herman Hack

MP

Joel Marston

P.E. Official

Bill Meader

Elderly News Vendor (uncredited)

Gertrude Hoffmann

Boy

Rudy Lee

Boy

Waldon Williams

Man in Church (uncredited)

Tex Holden

Elderly Man

Gus Taillon

Party Guest (uncredited)

Jimmie Horan

Elderly Woman

Dorothy Vernon

Worker Listening to Radio (uncredited)

Michael Jeffers

Bum

George Pal

Man in Church (uncredited)

Dick Johnstone

Marine Major

Stanley Orr

Marine Captain

Charles J. Stewart

Marine Lieutenant

Fred Zendar

Official (uncredited)

Wilbur Mack

Cameraman

Edward Wahrman