Another two-part Saturday morning cartoon from Hanna-Barbera. In the first part, Moby Dick is now a friendly whale, and a pet of young orphans Tom and Tub. Moby saves the two boys from the threats of sea-going villains. The second half follows the adventures of the titular Mighty Mightor. Tor is a teen-age caveman who, after helping an old hermit, received a magic club that transformed him into the super-powered Mightor. Along with his flying dinosaur pet Tog and his younger brother Li'l Rock, Mightor fought a never-ending battle against villainous stone-age baddies.