With his assistant, Laura Hutchinson, Dr. David Conway develops a device to advance the fledgling science of earthquake prediction. After forecasting a large trembleor that will rock California within twenty-four hours, Conway cannot persuade the Governor to act. When the prediction proves true and further tests indicate that there are more quakes to come, Conway and Laura seek to perfect their device. Subsequent tests deep within Carlsbad Caverns discover an unknown element—E-112—that is responsible for the earthquakes and threatens to destroy the globe if it ever reaches the surface. The team determines that with only four weeks until Armageddon, the race is on to neutralize the killer element before it takes a devastating toll.
William Leslie
as Dr. David Conway
Kathryn Grant
as Laura 'Hutch' Hutchinson
Tris Coffin
as Dr. Ellis Morton
Raymond Greenleaf
as Gov. Chaney
Paul Savage
as Ranger Kirk
Fred Coby
as Ranger Brown
Frank J. Scannell
as Sheriff Quinn
Charles Evans
as Gen. Bortes
Marshall Reed
as General's Aide
Terry Frost
as Chief Rescue Worker
David Armstrong
as Military Policeman (uncredited)
