The Australian series "H2O: Just Add Water" tells the story of three sixteen-year-old friends who gain supernatural abilities. Rikki, Emma, and Cleo accidentally stumble upon the mysterious Mako Island, where they discover a moon pool. Upon their return, the girls notice that each of them has developed magical powers directly connected to water. Their close friend Lewis is always by their side, guarding their secret and helping them navigate through challenging situations.