La bestia de la montaña

It is said that a mountain surrounded by a swamp is hollow and that a prehistoric monster from 'the dawn of time' comes out during times of drought to stalk the land.

Alright, so the plot lacks any sense of reality (there would have to be a whole race of dinosaurs for them to survive until the present day). The special effects also leave something to be desired. But look over these faults and you'll find that this film is actually very enjoyable and entertaining. The dinosaur isn't revealed until the last twenty minutes, but when it shows its face there's non-stop action, and for once the dinosaur can move fast and so poses a genuine threat. The dinosaur itself is fairly well-animated and there is a wonderful 'golden age of monster movies' feel about the whole thing.