An American cowboy living in Mexico discovers his cattle are being eaten by a giant prehistoric dinosaur.
One Day After A Million Years It Came Out Of Hiding To... Kill! Kill! Kill!
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Did You Know?
Riffed in season 11 of Mystery Science Theater 3000. See more
The footage of the stampeding cattle is obviously sped up to enhance the menace. See more
Well, maybe that's your answer. That swamp is a very mysterious and sinister place.