Captain Caveman & the Teen Angels

The Teen Angels go to the Wrangler Round-Up, a rodeo complex, to investigate rumors that their famous rodeo horse Devil Stallion is possessed by a demon. Bad Luck Bradford is the only one brave enough to ride the stallion, but during the rodeo he and the horse disappear. At the same time there is an explosion, and the bank is robbed during the show. Captain Caveman and the Teen Angels piece together the clues and come up with Bradford and the bank president as the culprits. A man from outer space steals a rare, secret energy-producing mineral from the Space Research Laboratory. Captain Caveman and the Teen Angels assist Professor Kreisler, who was in the lab at the time of the theft, with the investigation. They discover a flying saucer, which turns out to be a helicopter in disguise. Cavey breaks down the door of the spaceship and emerges with the spaceman--Kreisler's assistant.