- Cleo and Rikki enter their final year of high school. They make friends with a new girl, Bella, and a new boy, Will. However, they encounter a new force on Mako Island that has the power to turn water against the girls.
- Zane has a surprise: his dad bought the café and made him manager. He renames it after Rikki, whom he makes a full partner. Tone-deaf Nate nearly ruins the first life music performance, but Lewis saves with Isabel "Bella", whom the other mermaids accept after discovering she's one of them as they all abused their power to hassle playfully taunting surfers. Hunky local nature lover Will goes diving around Mako island. He discovers the magical cave, but it's a full moon and the serpentine water column knocks him out before escaping to attack the others. It grabs Rikki, but the other mermaids follow and liberate them. Will is totally confused, but unharmed.—KGF Vissers
- Cleo and Rikki are about to face their final year at school together without Emma, who's gone overseas. They're confident they've overcome the affect of the full moon and know everything about Mako Island and its magic. Zane surprises Rikki with an offer for her to join him as a partner in a new upmarket café, while Lewis is taking his relationship with Cleo a little too comfortably. When Will, a boy with remarkable skills underwater, stumbles upon the Moon Pool, he encounters a strange water force and is knocked unconscious. That night, at the opening of the new café, Rikki and Cleo meet Bella, a new girl who helps Rikki out of a tricky situation by stepping in to sing in Nate's band. In a break outside, Rikki is attacked by water and dragged out to sea. Bella sees this and joins Cleo to rescue Rikki. Cleo's shocked to find Bella is a mermaid too. Rikki is saved from the encounter but they find the new boy Will in the Moon Pool. The girls realise something has changed on Mako Island, and it appears Will is now on the trail of their magic and secret.
- Cleo and Rikki are about to face their final year at school together without Emma, who's gone overseas. They're confident they've overcome the affect of the full moon and know everything about Mako Island and its magic. Zane surprises Rikki with an offer for her to join him as a partner in a new upmarket cafe, while Lewis is taking his relationship with Cleo a little too comfortably. When Will, a boy with remarkable skills underwater stumbles upon the Moon Pool, he encounters a strange water force and is knocked unconscious. That night, at the opening of the new cafe, Rikki and Cleo meet Bella, a new girl who helps Rikki out of a tricky situation by stepping in to sing in Nate's band. In a break outside, Rikki is attacked by water and dragged out to sea. Bella sees this and j oins Cleo to rescue Rikki. Cleo is shocked to find Bella's a mermaid too! Rikki is saved from the encounter but they find the new boy Will in the Moon Pool. The girls realize something has changed on Mako Island, and it appears Will is now on the trail of their magic and secret.
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