Mako: Island of Secrets

Lore & Background

In series one, new mermaids Ondina and Mimmi join Sirena in the effort to remove Zac's powers. Evie, Zac's girlfriend, is accidentally transformed into a mermaid. The arrival of another merman, Erik, complicates matters, and it is discovered that Zac is a born merman and Mimmi's brother. Series three introduces Weilan, an Eastern mermaid fleeing a magical water dragon. Evie loses her mermaid tail and powers during a confrontation with the dragon, which is revealed to be Nerissa, an ancient mermaid transformed into the dragon. The mermaids must find a way to save her.

Reader's Guide

Mako: Island of Secrets is significant as a spin-off of the popular series H2O: Just Add Water, expanding the mermaid mythology to include a male protagonist and exploring themes of identity, family, and environmental stewardship. The show was produced with international partners including Netflix, which released the series in multiple territories, contributing to its global reach. It ran for three series, with a planned movie put on hold indefinitely. The series introduced new characters and storylines while maintaining continuity with its predecessor, and featured a special guest appearance by Cariba Heine as Rikki Chadwick from H2O: Just Add Water in its final episodes. Its legacy lies in its contribution to the mermaid genre in children's television and its successful cross-platform distribution.

Did You Know?

• The show was first announced as Mako: Island of Secrets, then as Secret of Mako Island, and finally as Mako Mermaids for its international release.
• Netflix labelled the first half of series two as 'Season 2', while the second half was called 'Season 3'.
• Series 3 is listed under Season 4 on Netflix, as Netflix released Series 2 in two separate parts in 2015.
• A movie was planned to be produced after the series ended, but the plan has been put on hold indefinitely.

Origins & Production

Mako: Island of Secrets was conceived as a direct continuation of the beloved Australian children's series H2O: Just Add Water, arriving five years after its predecessor's events in the narrative timeline. Created by Jonathan M. Shiff, the programme was designed for a young audience and produced by his own company, Jonathan M. Shiff Productions, in a collaborative arrangement with Network Ten, Germany's ZDF, and streaming giant Netflix. Additional support came from Screen Australia and Screen Queensland, underscoring the show's commitment to Australian storytelling with international reach. The project was first announced in July 2011, with plans for 26 half-hour episodes and the possibility of a single 90-minute special. Originally slated to begin shooting in April 2012, production was pushed back to early May. On 8 May 2012, Shiff Productions confirmed the principal cast and kicked off the shoot, which continued until 12 October of that year. The finished series was targeted for broadcast in the latter half of 2013, with a second season already in the pipeline. For audiences outside Australia, the show carried the international title Mako Mermaids.

Three-Season Story Arc

The narrative picks up five years after the events of H2O: Just Add Water, when a pod of true-born mermaids has returned to the waters around Mako Island after a long absence. The story's catalyst is Zac Blakely, a local teenager who goes camping on the island with his friend Cameron. Under the glow of a full moon, Zac is drawn to the Moon Pool and falls in, emerging the next morning with the power to manipulate water and, after an accidental dip, a fish-like merman tail. The three mermaids assigned to guard the island during the full moon—Lyla, Nixie, and Sirena—are cast out by their pod for allowing a human to visit. Driven by curiosity about land life and the need to strip Zac of his powers, they step into the human world. Series two deepens the mythology: the merman chamber is explored, new mermaids Ondina and Mimmi arrive, Evie is accidentally transformed, and the revelation that Zac is a born merman and Mimmi's long-lost brother reshapes every relationship. Series three introduces Weilan, an Eastern mermaid fleeing a destructive water dragon, and culminates in the dragon's identity as Nerissa, the long-lost mother of both Zac and Mimmi.

Character Ensemble & Relationships

At the heart of the series is an ensemble that shifts and evolves across three seasons. Lyla, the self-appointed leader of the original trio, is fiery and rebellious yet sharp-minded, and her initial mission to neutralize Zac's powers gradually softens into genuine affection. Nixie brings a restless, adventurous energy, acting on instinct and personal conviction, while Sirena serves as the gentle peacemaker between the two. Zac himself is a surf-loving, athletic teenager whose transformation into a merman upends his entire world. His best friend Cam, played by Dominic Deutscher, oscillates between loyal support and bitter jealousy over Zac's abilities, even attempting to become a merman himself before the two reconcile. Later seasons expand the cast significantly. Ondina is headstrong and single-minded in her quest to remove Zac's powers, while Mimmi, her more thoughtful companion, ultimately discovers he is her long-lost brother. Evie, Zac's girlfriend, navigates the shock of being transformed into a mermaid and then reverting to a human. Erik, a solitary merman from a lineage unseen for millennia, and Weilan, a sassy Eastern mermaid who prefers the safety of land, each bring fresh dynamics to the group.

World-Building & Merfolk Lore

The mythology of Mako Island runs on carefully established rules that give the series its internal logic. The Moon Pool is the central magical site, and the full moon acts as the trigger for transformation—Zac's fall into the pool under a full moon is what grants him his merman form and water-manipulation abilities. The pod, a social unit of merfolk, structures the mermaids' society, and breaking its rules carries severe consequences, as Lyla, Nixie, and Sirena learn when they are exiled for permitting a human to visit the island. Beneath the surface, the merman chamber holds additional secrets and a trident of significance. The broader lore includes a lineage of mermen unseen for thousands of years, a fact that gives Erik's arrival extraordinary weight. Rita Santos, the school principal, serves as a living archive of merfolk history. She abandoned her own pod years earlier to be with a human man who died before their wedding, and she now mentors the younger mermaids in the proper use of their powers. The Ocean Cafe, where David, Carly, and Erik work, anchors the human-world side of the story, giving the mermaids a familiar, everyday space to interact with land-dwellers.