When a prehistoric horse is captured, a group of adventurers decide to travel to Mexico's Forbidden Valley in search of other specimens for their circus. Winged, fanged monsters and some mighty pissed off dinosaurs cannot dissuade the motley crew of cowboys, but as we all well know from cinematic experience, if you mess with prehistoric carnivores, they're going to come back and bite you. 'The Valley Of The Gwangi' is a classic slice of Harryhausen stop motion animation and while the story is not amongst the best the special effects are still great.