In a classic Hanna-Barbera cartoon, two young orphans, Tom and Tub, are aided by their friendly whale pet Moby Dick in their battles against sea-going villains. Meanwhile, a teenage caveman named Tor is transformed into the superhero Mightor after helping an old hermit, and uses his powers to fight against stone-age villains alongside his flying dinosaur pet Tog and younger brother Li'l Rock.
