The Beast of Hollow Mountain (1956)

In the sun-baked expanse of the Mexican frontier, an American cowboy confronts a reality that shatters the boundaries of known existence. His livelihood, his very way of life, is threatened. Not by bandits, nor drought, but by something far more ancient and terrifying. A colossal predator, ripped from the pages of prehistory, is decimating his cattle. He now faces a desperate battle for survival against a monstrous echo of a forgotten world, where the dust of the present is stained with the blood of the past. The cowboy must rise to meet a challenge unlike any other.