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.
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[Opening narration: "Moby Dick"
When a typhoon suddenly strikes, Tom and Tub are swept miles away from their uncle's vessel "The Sea Explorer" and find themselves in uncharted waters surrounded by menacing sharks. When all seems lost, they are rescued by the giant white whale, Moby Dick. Tom and Tub happily realize they have found a new friend who will protect them as they face the perils of the deep together.