Mako mermaids an h₂o adventure. Season 1, vol. 2, Moon pool magic
Mermaids Sirena, Nixie and Lyla are still bristling after Zac, land-boy turned merman during a magical accident at the Mako Island Moon Pool, finds out their identities. But after the entrance to the Moon Pool suddenly closes with their friend Evie stuck inside, they have no choice but to work together with Zac to set her free.