Dexter steals a book from Calabash and discovers it contains instructions for building a powerful cannon. He and his henchmen manage to gather all the components for the weapon, except the firing pin. They discover this is being used as the medal for Quetzo's Aqua-olympics tennis competition. So Dexter enters the contest and steals the pin.

Iloka is threatened by a king tide, so the islanders build a wall around their village to keep the water out. However, Dexter breaches the wall and, as the sea rushes in, the villagers are forced to flee up the mountain. With the village underwater, Dexter and his henchmen move in and seal the wall behind them, proclaiming Dexter King of Iloka.