A huge burrowing machine tunnels out of control at ferocious speed, cutting clean through to the center of the earth, to the twilight world of pellucidar. Once there, Dr. Perry and David Innes are threatened by half human creatures, lizard-like birds, and man-eating plants.

Geophysicist Dr. Josh Keyes discovers that an unknown force has caused the earth’s inner core to stop rotating. With the planet’s magnetic field rapidly deteriorating, our atmosphere literally starts to come apart at the seams with catastrophic consequences. To resolve the crisis, Keyes, along with a team of the world’s most gifted scientists, travel into the earth’s core. Their mission: detonate a device that will reactivate the core.

Dr. Adrian Helmsley, part of a worldwide geophysical team investigating the effect on the earth of radiation from unprecedented solar storms, learns that the earth’s core is heating up. He warns U.S. President Thomas Wilson that the crust of the earth is becoming unstable and that without proper preparations for saving a fraction of the world’s population, the entire race is doomed. Meanwhile, writer Jackson Curtis stumbles on the same information. While the world’s leaders race to build “arks” to escape the impending cataclysm, Curtis struggles to find a way to save his family. Meanwhile, volcanic eruptions and earthquakes of unprecedented strength wreak havoc around the world.

For 5 billion years the Earth’s core has operated like a giant, nuclear reactor. Now it’s overheated, melting down like a bomb that’s about to explode. The earth is being ripped apart at the seams and beneath LA, pressure is building. After a mass evacuation, Calvin Crawford is one of few left, desperately searching for his fiancée, Ashley Pace, who unbeknownst to him, has been kidnapped and is being held hostage. With LA becoming more unstable by the minute, Calvin, must find a way to save Ashley and get them both to safety before the city is completely annihilated.