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