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"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