Director
Fred F. Sears
DIRECTOR
Stars (in credits order)
Kathryn Grant
Laura Hutchinson
William Leslie
Dr. David Conway
Tristram Coffin
Dr. Ellis Morton
Raymond Greenleaf
Gov. Chaney
Charles Evans
Gen. Bortes
Frank J. Scannell
Sheriff Quinn
Marshall Reed
General's Aide
Fred Coby
Ranger Brown
Paul Savage
Ranger Kirk
Terry Frost
Chief Rescue Worker
Richard Alexander
Workman (uncredited)
Leon Alton
Scientist (uncredited)
David Armstrong
Military Policeman (uncredited)
Paul Bradley
John Close
Soldier (uncredited)
Oliver Cross
Roy Damron
Ranger (uncredited)
Dan Dowling
George Ford
Plant Worker (uncredited)
James Gonzalez
Herschel Graham
Sam Harris
Governor's Board Member (uncredited)
Robert Kino
Ethan Laidlaw
Lyle Latell
Civil Defense Chief Carson (uncredited)
Perk Lazelle
Pierce Lyden
Chief Ranger (uncredited)
Philo McCullough
Paul McGuire
Reporter (uncredited)
Gerald Mohr
Narrator (uncredited)
Dennis Moore
Radio Communications Man (uncredited)
Charles Morton
Sol Murgi
John Phillips
Governor's Secretary (uncredited)
Narrator (uncredited) (voice)
Natividad Vacío
Hospital Physician (uncredited)
Otto Waldis
Professor Hagstrom (uncredited)
John Zaremba
Daniel J. Winters (uncredited)