[Mightor] Grok challenges Mightor to fight Tyrannor, a giant T-Rex, or he will destroy the village. [Moby Dick] While exploring an old sunken ship, the boys and Scooby encounter Crab Creatures that capture Tubb. [Mightor] Sheera and Li'l Rok are sent to warn Chief Pondo and the villagers of Brutor the Barbarians's plan to attack the village.