Mysterious and unearthly deaths start to occur while Professor Saxton is transporting the frozen remains of a primitive humanoid creature he found in Manchuria back to Europe.

Dr. Steven Sorenson plans to tap the geothermal energy of the Earth’s interior by means of a thermonuclear device detonated deep within the Earth.This experiment causes a crack to form and grow within the earth’s crust, which threatens to split the earth in two if it is not stopped in time.