Three teenage girls gain the power to turn into mermaids every time they touch the water and embark on the most exciting adventures in the depths of the sea.
Cleo and Rikki face their final year of high school without Emma. They make a new friend in Bella, and meet new boy, Will. Suitable for children aged 8+. (S3, ep 1)
Will seeks confirmation of his first experience on Mako Island. Meanwhile, the girls discover the Moon Pool has changed. Suitable for children aged 8+. (S3, ep 2)
Cleo seeks a new job as an assistant dolphin trainer at the Marine Park. Rikki fires Nate's band from playing at the cafe. Suitable for children aged 8+. (S3, ep 3)
Cleo is forced to put Lewis' plans for romance on hold as she tries to restrain Kim's out-of-control love life. Suitable for children aged 8+. (S3, ep 4)
Zane concocts a dirt bike race to publicise the cafe. Cleo and Lewis make a big discovery about mixing the waters in the Moon Pool. Suitable for children aged 8+. (S3, ep 5)
Secrets and Lies: Bella considers a relationship with Will. Lewis tests the Moon Pool water at school and attracts his science teacher's attention. Suitable for children aged 8+. (S3, ep 6)
Don ends his relationship with Samantha. Meanwhile, Will's sister Sophie competes with Bella for a job at the cafe. Suitable for children aged 8+. (S3, ep 7)
Rikki and Bella try to protect themselves from a full moon attack. But Bella is captured by a water tentacle and taken to Mako Island. Suitable for children aged 8+. (S3, ep 8)
Cleo defies Lewis' advice and experiments with the magic Moon Pool water. Suitable for children aged 8+. (S3, ep 9)
Bella's warned to back off from Will as he's on the trail of the girls' mermaid secrets. Suitable for children aged 8+. (S3, ep 10)
Bella helps Will with his free-diving training. Rikki and Cleo have to improvise at the cafe's first corporate function. Suitable for children aged 8+. (S3, ep 11)
Rikki receives counterfeit money at the cafe and is held captive by criminals on a boat. Can the others rescue her? Suitable for children aged 8+. (S3, ep 12)
Kim attempts to derail Don and Samantha's wedding, and Lewis receives an opportunity to study in America. Suitable for children aged 8+. (S3, ep 13)
Will pushes himself too far. The girls discover a unique crystal in the rock from the Moon Pool. Suitable for children aged 8+. (S3, ep 14)
Sophie uses Bella's idea for a fundraising concert and presents it as her own. Cleo's caught in the crossfire with Kim and Samantha. Suitable for children aged 8+. (S3, ep 15)
Frustrated by the water attacks, Rikki goes to Mako Island to confront the strange force in the Moon Pool as Will pursues her. Suitable for children aged 8+. (S3, ep 16)
Cleo is introduced to Ryan, a young geophysicist who's working for Samantha. Suitable for children aged 8+. (S3, ep 17)
Rikki fears Ryan's explorations on Mako Island will uncover their secrets, and almost goes too far trying to stop him. Suitable for children aged 8+. (S3, ep 18)
Will competes in the Free-Diving Championships. Rikki sees Sophie kissing Zane at the event and breaks off their relationship. Suitable for children aged 8+. (S3, ep 19)
Zane installs Sophie as head of staff at the cafe. Meanwhile, Bella develops a sneezing allergy that also triggers her powers. Suitable for children aged 8+. (S3, ep 20)
The girls discover the Mako crystals contain immense energy and need to mount a rescue mission when Zane jealously steals one. Suitable for children aged 8+. (S3, ep 21)
The girls sit their final school exams and have to avoid a water attack in public when the full moon rises early. Suitable for children aged 8+. (S3, ep 22)
Bella's eager to ask Will to the end of year party, but he asks Rikki. Sophie tries to get Zane to change the name of the cafe. Suitable for children aged 8+. (S3, ep 23)
Don gets a second job at the Marine Park on the Pirate ship and outshines Cleo. Bella and Will struggle to to connect. Suitable for children aged 8+. (S3, ep 24)
Cleo discovers a comet is causing fish to flee the waters around Mako Island. Sophie, Ryan and Zane join forces. Suitable for children aged 8+. (S3, ep 25)
The girls must improvise when Sophie and Ryan damage the Moon Pool in their efforts to obtain the rare crystals. Season finale. Suitable for children aged 8+. (S3, ep 26)