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