When Ray Harryhausen was looking for new ideas, he came across an old script - intended for a never-made film - written by Willis O'Brien (creator and animator of RKO's 'King Kong'). Wth a little re-writing, this film came into being. I remember seeing this film as a kid. Personally, I think it's still as good now as it was then. Ray Harryhausen's special effects are, as always, first-rate. The story is both interesting and exciting, contains barely a dull moment. Scenes of the cowboys riding into the forbidden valley, the little horse in its miniature stable, and the roping of the titular allosaur had stuck in my mind since I first saw this film. Combining a western with a dinosaur movie was certainly a master-stroke. The human characters are interesting, as are the dinosaurs - you really do feel sympathy for Gwangi at the finale. The soundtrack is excellent, and the backgrounds are atmospheric and dramatic. Besides this film, now looking better than ever, this DVD also contains an interesting look at the making of Gwangi, including interviews with Ray Harryhausen himself. This is recommended whether you're a fan of dinosaurs or monster movies in general.