Zac is a teenager going camping on Mako Island with his best friend, Cam for a night. Sirena, Lyla, and Nixie are three mermaids on Mako Island. On the night Zac camping, 3 mermaids fail to stop Zac from falling into Mako’s magic Moon Pool water. And interesting event happens. The full moon comes overhead and Zac is transformed into a half-human and half-merman!