Gene Barry
Dr. Clayton Forrester
Acting
Ann Robinson
Sylvia Van Buren
Acting
Lewis Martin
Pastor Dr. Matthew Collins
Acting
Les Tremayne
Maj. Gen. Mann
Acting
Frank Kreig
Fiddler Hawkins (uncredited)
Acting
Vernon Rich
Col. Ralph Heffner
Acting
Sandro Giglio
Dr. Bilderbeck
Acting
Ann Codee
Dr. Duprey (uncredited)
Acting
Robert Cornthwaite
Dr. Pryor (as Bob Cornthwaite)
Acting
Cedric Hardwicke
Commentary (voice) (as Sir Cedric Hardwicke)
Acting
Houseley Stevenson Jr.
Gen. Mann's Aide (as Housely Stevenson Jr.)
Editing
William Phipps
Wash Perry (as Bill Phipps)
Acting
Jack Kruschen
Salvatore
Acting
Paul Birch
Alonzo Hogue (uncredited)
Acting
Paul Frees
Second Radio Reporter / Opening Announcer
Acting
Henry Brandon
Cop at Crash Site
Acting
Peter Adams
Pine Summit Fire Watcher (uncredited)
Acting
Eric Alden
Man (uncredited)
Acting
Hugh Allen
Brigadier General (uncredited)
Acting
Ruth Barnell
Mother (uncredited)
Acting
Edgar Barrier
Prof. McPherson (uncredited)
Acting
Russ Bender
Dr. Carmichael (uncredited)
Acting
Oscar Blank
Man in Church (uncredited)
Acting
Hazel Boyne
Screaming Woman (uncredited)
Acting
Chet Brandenburg
Man in Church (uncredited)
Acting
George Bruggeman
Soldier (uncredited)
Acting
Nora Bush
Woman in Church (uncredited)
Acting
Tony Butala
Boy in Final Church (uncredited)
Acting
Mushy Callahan
Burning Soldier at Pit (uncredited)
Acting
Dick Cherney
Looter (uncredited)
Acting
Edward Colmans
Spanish Priest (uncredited)
Acting
James Conaty
Man at Pacific Institute of Science and Technology (uncredited)
Acting
Russ Conway
Rev. Bethany (uncredited)
Acting
Martin Coulter
Marine Sergeant (uncredited)
Acting
Vittorio Cramer
First Radio Reporter (uncredited)
Acting
Pierre Cressoy
Frenchman (uncredited)
Acting
Oliver Cross
Scientist (uncredited)
Acting
Jane Crowley
Woman in Church (uncredited)
Acting
Jim Davies
Marine Commanding Officer (uncredited)
Acting
Helen Dickson
Woman in Church (uncredited)
Acting
Ralph Dumke
Buck Monahan (uncredited)
Acting
Jimmie Dundee
Civil Defense Official (uncredited)
Acting
Al Ferguson
Police Chief (uncredited)
Acting
Dick Fortune
Marine Captain (uncredited)
Acting
Alex Frazer
Dr. James (uncredited)
Acting
Frank Freeman Jr.
Bum #2 Listening to Radio (uncredited)
Production
Slim Gaut
Radio Listener (uncredited)
Acting
Charles Gemora
Martian (uncredited)
Acting
Ned Glass
Well-Dressed Looter (uncredited)
Acting
Jack Gordon
Man in Church (uncredited)
Acting
Fred Graham
Looter (uncredited)
Acting
Joe Gray
Looter (uncredited)
Acting
Herman Hack
Worker Listening to Radio (uncredited)
Acting
Nancy Hale
Young Wife (uncredited)
Acting
Virginia Hall
Girl (uncredited)
Acting
Ted Hecht
KGEB Reporter (uncredited)
Acting
Douglas Henderson
Staff Sergeant (uncredited)
Acting
Gertrude Hoffmann
Elderly News Vendor (uncredited)
Acting
Tex Holden
Man in Church (uncredited)
Acting
Jimmie Horan
Party Guest (uncredited)
Acting
Patricia Iannone
Girl (uncredited)
Acting
Jerry James
Reporter (uncredited)
Acting
Michael Jeffers
Worker Listening to Radio (uncredited)
Acting
Dick Johnstone
Man in Church (uncredited)
Acting
Carolyn Jones
Blonde Party Guest (uncredited)
Acting
Don Kohler
Colonel (uncredited)
Acting
Ivan Lebedeff
Dr. Gratzman (uncredited)
Acting
Freeman Lusk
Secretary of Defense (uncredited)
Acting
Herbert Lytton
Chief of Staff (uncredited)
Acting
Wilbur Mack
Official (uncredited)
Acting
George Magrill
Traffic Cop (uncredited)
Acting
Mike Mahoney
Townsman (uncredited)
Acting
John Mansfield
Man (uncredited)
Acting
Joel Marston
Military Policeman in Jeep (uncredited)
Acting
Sydney Mason
Fire Chief, Crew #3 (uncredited)
Acting
John Maxwell
Doctor (uncredited)
Acting
Mathew McCue
Man in Church (uncredited)
Acting
David McMahon
Minister, First Church (uncredited)
Acting
William Meader
P.E. Official (uncredited)
Acting
Lee Miller
Reporter (uncredited)
Acting
Ralph Montgomery
Los Angeles Red Cross Official (uncredited)
Acting
Alvy Moore
Zippy (uncredited)
Acting
Bob Morgan
Injured Civil Defense Worker (uncredited)
Crew
Charles Morton
Worker Listening to Radio (uncredited)
Acting
George Nardelli
Military Officer (uncredited)
Acting
Stanley Orr
Marine Major (uncredited)
Acting
George Pal
Bum #1 Listening to Radio (uncredited)
Directing
Walter Richards
Reporter (uncredited)
Acting
Robert Rockwell
Forest Ranger at Crash Site (uncredited)
Acting
Walter Sande
Sheriff Bogany (uncredited)
Acting
James Seay
Air Force Bomber Pilot (uncredited)
Acting
Allen D. Sewall
Man in Church (uncredited)
Acting
Lucile Sewall
Woman in Church (uncredited)
Acting
Cora Shannon
Old Woman (uncredited)
Acting
David Sharpe
Looter (uncredited)
Acting
Teru Shimada
Japanese Diplomat (uncredited)
Acting
Reginald Lal Singh
Military Officer (uncredited)
Acting
Bobby Somers
Deputy at Crash Site (uncredited)
Crew
Bert Stevens
Man in Church (uncredited)
Acting
Charles Stewart
Marine Captain (uncredited)
Acting
Jack Stoney
Looter (uncredited)
Acting
Gus Taillon
Elderly Man (uncredited)
Acting
Morton C. Thompson
Reporter (uncredited)
Acting
Arthur Tovey
Party Guest (uncredited)
Acting
Dale Van Sickel
Looter (uncredited)
Acting
Dorothy Vernon
Elderly Woman at Square Dance (uncredited)
Acting
Anthony Warde
Military Police Driver (uncredited)
Acting
Bob Whitney
Military Officer (uncredited)
Acting
Chalky Williams
Worker Listening to Radio (uncredited)
Acting
Waldon Williams
Boy (uncredited)
Acting
Bud Wolfe
Rescuing Civil Defense Worker (uncredited)
Acting
Fred Zendar
Marine Lieutenant (uncredited)
Acting