- 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 hace el papel de Dr. Clayton Forrester.
Ann Robinson interpreta a Sylvia Van Buren en la película.
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 hace el papel de Col. Ralph Heffner.
Sandro Giglio interpreta a Dr. Bilderbeck en la película.
Ann Codee hace el papel de Dr. Duprey (uncredited).
Robert Cornthwaite interpreta a Dr. Pryor (as Bob Cornthwaite) en la película.
Cedric Hardwicke interpreta a Commentary (voice) (as Sir Cedric Hardwicke) en la película.
Houseley Stevenson Jr. interpreta a Gen. Mann's Aide (as Housely Stevenson Jr.) en la película.
William Phipps interpreta a Wash Perry (as Bill Phipps) en la película.
Jack Kruschen hace el papel de Salvatore.
Paul Birch interpreta a Alonzo Hogue (uncredited) en la película.
Paul Frees hace el papel de Second Radio Reporter / Opening Announcer.
Henry Brandon interpreta a Cop at Crash Site en la película.
Peter Adams interpreta a Pine Summit Fire Watcher (uncredited) en la película.
Eric Alden interpreta a Man (uncredited) en la película.
Edgar Barrier interpreta a Prof. McPherson (uncredited) en la película.
Russ Bender interpreta a Dr. Carmichael (uncredited) en la película.
Oscar Blank hace el papel de Man in Church (uncredited).
Hazel Boyne interpreta a Screaming Woman (uncredited) en la película.
Chet Brandenburg interpreta a Man in Church (uncredited) en la película.
George Bruggeman interpreta a Soldier (uncredited) en la película.
Nora Bush interpreta a Woman in Church (uncredited) en la película.
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 hace el papel de Spanish Priest (uncredited).
James Conaty interpreta a Man at Pacific Institute of Science and Technology (uncredited) en la película.
Russ Conway interpreta a Rev. Bethany (uncredited) en la película.
Vittorio Cramer hace el papel de First Radio Reporter (uncredited).
Pierre Cressoy interpreta a Frenchman (uncredited) en la película.
Oliver Cross hace el papel de Scientist (uncredited).
Jane Crowley hace el papel de Woman in Church (uncredited).
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 hace el papel de Police Chief (uncredited).
Dick Fortune interpreta a Marine Captain (uncredited) en la película.
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 hace el papel de Well-Dressed Looter (uncredited).
Jack Gordon interpreta a Man in Church (uncredited) en la película.
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 hace el papel de Young Wife (uncredited).
Ted Hecht interpreta a KGEB Reporter (uncredited) en la película.
Douglas Henderson interpreta a Staff Sergeant (uncredited) en la película.
Gertrude Hoffmann interpreta a Elderly News Vendor (uncredited) en la película.
Tex Holden interpreta a Man in Church (uncredited) en la película.
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 interpreta a Worker Listening to Radio (uncredited) en la película.
Dick Johnstone hace el papel de Man in Church (uncredited).
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 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 hace el papel de Townsman (uncredited).
John Mansfield interpreta a Man (uncredited) en la película.
Joel Marston interpreta a Military Policeman in Jeep (uncredited) en la película.
Sydney Mason interpreta a Fire Chief, Crew #3 (uncredited) en la película.
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 hace el papel de Reporter (uncredited).
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 interpreta a Marine Major (uncredited) en la película.
George Pal hace el papel de Bum #1 Listening to Radio (uncredited).
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 interpreta a Air Force Bomber Pilot (uncredited) en la película.
Allen D. Sewall hace el papel de Man in Church (uncredited).
Lucile Sewall interpreta a Woman in Church (uncredited) en la película.
Cora Shannon hace el papel de Old Woman (uncredited).
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 hace el papel de Party Guest (uncredited).
Dale Van Sickel hace el papel de Looter (uncredited).
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 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 interpreta a Marine Lieutenant (uncredited) en la película.
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