Mako:Island of Secrets is the upcoming 26 episode spin-off series of H2O: Just Add Water. It was supposed to start being filmed in April 2012, but the production was postponed until May. Zac is played by Chai Romruen, and the three mermaids are played by Lucy Fry, Ivy Latimer and Amy Ruffle. The show was originally titled Mako: Islands of Secrets, but was later changed to Mako Mermaids. Then the title changed again to Secret of Mako Island.
Secret of Mako Island centers on three mermaids, Sirena ,Nixie and Lyla, who are charged with the task of protecting their magical Mako Island from trespassers, only to be thwarted by the arrival of a 15 year old land-dweller Zac – who forms a special connection with the island and is granted a fish-like tail and Mermaid_Powers. Threatened by his existence, the mermaid pod are forced to move away, abandoning Sirena, Nixie and Lyla, who in a bid for survival must get legs, venture onto land, and take back Zac’s powers or risk being outcasts forever.