In the coastal town of Cleo, three teenage girls, Cleo, Emma, and Rikki, stumbled upon an ancient secret. While exploring the mysterious Mako Island, they swam into a magical pool that transformed them into mermaids.
As mermaids, they discovered they had incredible powers. Cleo could control and manipulate water, Emma could freeze water, and Rikki could boil water. They soon learned that they had to keep their secret hidden...