On her fifteenth birthday, a young mermaid princess is allowed to swim up and see the world above the sea. She sees a large ship with a handsome young prince. Soon a storm rises and wrecks the ship and the mermaid quickly swims over to rescue the prince and swim him to shore. The Little Mermais fins herself falling in love with the young prince and decides that she will do anything to be with him, even if it means trading her beautiful voice for real legs.