"One Day After A Million Years It Came Out Of Hiding To... Kill! Kill! Kill!". An American cowboy living in Mexico discovers his cattle is being eaten by a giant prehistoric dinosaur.

Movie rating: 5.1 / 10 (607)

Directed by: Edward Nassour - Ismael Rodríguez

Writer credits: Robert Hill - Jack DeWitt

Cast: Guy Madison - Patricia Medina - Carlos Rivas - Mario Navarro - Pascual García Peña

AKA: Monstruo de la Montaña Hueca, El Valley of the Mists, Valley of the Mists, El monstruo de la Montaña Hueca

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