《唾弃2025》一名前科犯在离开澳洲二十年后返回，却遭到拘留。在拘留期间，他面对旧日的敌人，也结交了新朋友，并传授他心目中的“澳洲式兄弟情”，同时设法始终占据上风。

　　Zac is a teenage boy who decides to camp on Mako Island, unaware that three mermaids, Sirena, Nixie and Lyla, who are guardians of the island, are watching him. That night, when the full moon rises, the boy comes into contact with the magic water of the Moon Pool. The following morning, Zac wakes up discovering he has become a merman with a fish-like tail and the ability to control and manipulate water. His new-found merman abilities will cause problems for the mermaids.　　The three mermaids, curious about living on land, are transformed into humans while in the moon pool during a full moon, now having the ability to live like humans.