Flipper & Lopaka S01E19 - High Tide

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.