Dr. Clayton Forrester
Gene Barry
Sylvia Van Buren
Ann Robinson
Gen. Mann's Aide (as Housely Stevenson Jr.)
Houseley Stevenson Jr.
Looter (uncredited)
Jack Stoney
Elderly Man (uncredited)
Gus Taillon
Reporter (uncredited)
Morton C. Thompson
Party Guest (uncredited)
Arthur Tovey
Dale Van Sickel
Elderly Woman at Square Dance (uncredited)
Dorothy Vernon
Cameraman (uncredited)
Edward Wahrman
Military Police Driver (uncredited)
Anthony Warde
Military Officer (uncredited)
Bob Whitney
Worker Listening to Radio (uncredited)
Chalky Williams
Wash Perry (as Bill Phipps)
William Phipps
Boy (uncredited)
Waldon Williams
Rescuing Civil Defense Worker (uncredited)
Bud Wolfe
Marine Lieutenant (uncredited)
Fred Zendar
Salvatore
Jack Kruschen
Alonzo Hogue (uncredited)
Paul Birch
Second Radio Reporter / Opening Announcer
Paul Frees
Cop at Crash Site
Henry Brandon
Pine Summit Fire Watcher (uncredited)
Peter Adams
Man (uncredited)
Eric Alden
Brigadier General (uncredited)
Hugh Allen
Mother (uncredited)
Ruth Barnell
Pastor Dr. Matthew Collins
Lewis Martin
Prof. McPherson (uncredited)
Edgar Barrier
Dr. Carmichael (uncredited)
Russ Bender
Man in Church (uncredited)
Oscar Blank
Screaming Woman (uncredited)
Hazel Boyne
Chet Brandenburg
Soldier (uncredited)
George Bruggeman
Woman in Church (uncredited)
Nora Bush
Boy in Final Church (uncredited)
Tony Butala
Burning Soldier at Pit (uncredited)
Mushy Callahan
Dick Cherney
Maj. Gen. Mann
Les Tremayne
Spanish Priest (uncredited)
Edward Colmans
Man at Pacific Institute of Science and Technology (uncredited)
James Conaty
Rev. Bethany (uncredited)
Russ Conway
Marine Sergeant (uncredited)
Martin Coulter
First Radio Reporter (uncredited)
Vittorio Cramer
Frenchman (uncredited)
Pierre Cressoy
Scientist (uncredited)
Oliver Cross
Jane Crowley
Marine Commanding Officer (uncredited)
Jim Davies
Helen Dickson
Fiddler Hawkins (uncredited)
Frank Kreig
Buck Monahan (uncredited)
Ralph Dumke
Civil Defense Official (uncredited)
Jimmie Dundee
Police Chief (uncredited)
Al Ferguson
Marine Captain (uncredited)
Dick Fortune
Dr. James (uncredited)
Alex Frazer
Bum #2 Listening to Radio (uncredited)
Frank Freeman Jr.
Radio Listener (uncredited)
Slim Gaut
Martian (uncredited)
Charles Gemora
Well-Dressed Looter (uncredited)
Ned Glass
Jack Gordon
Col. Ralph Heffner
Vernon Rich
Fred Graham
Joe Gray
Herman Hack
Young Wife (uncredited)
Nancy Hale
Girl (uncredited)
Virginia Hall
KGEB Reporter (uncredited)
Ted Hecht
Staff Sergeant (uncredited)
Douglas Henderson
Elderly News Vendor (uncredited)
Gertrude Hoffmann
Tex Holden
Jimmie Horan
Dr. Bilderbeck
Sandro Giglio
Patricia Iannone
Jerry James
Michael Jeffers
Dick Johnstone
Blonde Party Guest (uncredited)
Carolyn Jones
Colonel (uncredited)
Don Kohler
Dr. Gratzman (uncredited)
Ivan Lebedeff
Secretary of Defense (uncredited)
Freeman Lusk
Chief of Staff (uncredited)
Herbert Lytton
Official (uncredited)
Wilbur Mack
Dr. Duprey (uncredited)
Ann Codee
Traffic Cop (uncredited)
George Magrill
Townsman (uncredited)
Mike Mahoney
John Mansfield
Military Policeman in Jeep (uncredited)
Joel Marston
Fire Chief, Crew #3 (uncredited)
Sydney Mason
Doctor (uncredited)
John Maxwell
Mathew McCue
Minister, First Church (uncredited)
David McMahon
P.E. Official (uncredited)
William Meader
Lee Miller
Dr. Pryor (as Bob Cornthwaite)
Robert Cornthwaite
Los Angeles Red Cross Official (uncredited)
Ralph Montgomery
Zippy (uncredited)
Alvy Moore
Injured Civil Defense Worker (uncredited)
Bob Morgan
Charles Morton
George Nardelli
Marine Major (uncredited)
Stanley Orr
Bum #1 Listening to Radio (uncredited)
George Pal
Walter Richards
Forest Ranger at Crash Site (uncredited)
Robert Rockwell
Sheriff Bogany (uncredited)
Walter Sande
Commentary (voice) (as Sir Cedric Hardwicke)
Cedric Hardwicke
Air Force Bomber Pilot (uncredited)
James Seay
Allen D. Sewall
Lucile Sewall
Old Woman (uncredited)
Cora Shannon
David Sharpe
Japanese Diplomat (uncredited)
Teru Shimada
Reginald Lal Singh
Deputy at Crash Site (uncredited)
Bobby Somers
Bert Stevens
Charles Stewart
Stunts
Makeup Supervisor
Wally Westmore
Assistant Director
Michael D. Moore
Special Effects
A. Edward Sutherland
Costumer
Producer
Executive Producer
Cecil B. DeMille
Costume Design
Edith Head
Original Music Composer
Leith Stevens
Sound Director
Loren L. Ryder
Director
Byron Haskin
Novel
H.G. Wells
Technical Advisor
Robert S. Richardson
Producer's Assistant
Gae Griffith
Chesley Bonestell
Color Grading
Monroe W. Burbank
Orchestrator
George Parrish
Diana Gemora
Key Grip
Murray Young
Gaffer
Soldier Graham
Visual Effects Camera
Cliff Shirpser
Visual Effects
Walter Hoffman
Modeling
Marcel Delgado
Jack Caldwell
Irmin Roberts
Paul K. Lerpae
W. Wallace Kelley
Gordon Jennings
Jan Domela
Ivyl Burks
Barney Wolff
Aubrey Law
Ken Strickfaden
Bob Springfield
Chester Pate
Sound Effects
Walter Oberst
Sound Editor
Lovell Norman
Tommy Middleton
Dan Johnson
Howard Beals
William M. Andrews
Sound Recordist
Harry Lindgren
Gene Garvin
Props
Lee Vasque
Milt Olson
Construction Coordinator
Gene Lauritzen
Charles Davies
Property Master
Gordon Cole
Romaine Birkmeyer
Painter
Production Manager
Frank Caffey
Set Decoration
Emile Kuri
Albert Nozaki
Art Direction
Hal Pereira
Editor
Everett Douglas
Director of Photography
George Barnes
Associate Producer
Screenplay
Barré Lyndon