One day, while on a hunting trip, a teenagecavemannamedTor, along with his winged petdinosaurTog, rescue an old man who, as a reward, gives Tor a magical club. When Tor raises his club to the sky, he transforms into the masked and muscularMightor, aprehistoricsuperherowho possesses superhuman strength and the power of flight through his club, which can also fire energy blasts. He can also transform Tog into a powerful fire-breathing dragon.
Mightor protects his village from evil-doers. Amongst the villagers are the chief, Pondo, and his daughter, the beautiful redhaired Sheera. Sheera has a younger brother named Little Rok, who loves pretending to be Mightor. The characters have several pets, including Little Rok'sdodo bird, Ork, and Sheera'smammothcalf, Bollo.