This Hanna-Barbera cartoon follows the adventures of a prehistoric superhero. A teenager traveling with his pet dinosaur named Tog helps an old man who is being attacked by a man-eating dinosaur. As a reward for his help, Tor is given a club with magic powers. When he raises it over his head and yells "Mightor," he is transformed into a man with superhuman strength who can fly and wields a power club that emits force beams. In addition, his pet dinosaur is transformed into a flying, fire-breathing dragon.