An earthquake reactivates a long-dormant volcano, threatening the small town of Ascension, trembling in its shadow. But the gaping maws in the region reveal evidence of something else — a centuries-old subterranean creature at last given the chance to break free in a black cloud of fire and ash. As the Behemoth wreaks havoc, it’s a race against time as a small band of rescuers fight it with a force as destructive as the beast itself.