Cowpokes head into a mysterious Mexican valley to head 'em up and move 'em out. But they're not looking for little doggies. They're looking for great big dinosaurs. James Franciscus stars in this thunderous adventure featuring amazing special effects by Ray Harryhausen. Franciscus plays a Wild West showman who leads his riding and roping crew into the title region where prehistoric giants still roam. Thanks to Harryhausen wizardry, fantastic creatures lunge, fight and rampage in scene after dazzling scene. Saddle up and join the excitement.