Cleo and Emma meet new girl, Rikki, and find themselves stuck on Mako Island where they are transformed into mermaids. As well as growing tails, the girls find they have powers over water.
Tara arrives at the Academy excited about the year ahead but soon discovers that she is the worst dancer in the class. As Tara struggles to fit in, she learns the hard way to respect her teachers.
Country-girl Tara Webster travels to Sydney to audition for the prestigious National Academy of Dance. It's a tumultuous week as she realises her dream of becoming a dancer is going to be a lot more difficult.
Rhydian and Jana mysteriously collapse as a comet appears on the dark of the moon – can Shannon save the day?
Rhydian is determined to help Jana while Shannon follows her dream and Tom faces the wrath of the K's.
At home, JB and Amanda try to convince the Wilson parents missing Alex will be back. With help from the people, brave Kuru cunningly frees Alex, Omar and Vashan, who shows them a rune to restore one's powers, but it can only be used with magic.
AMBER, ZOEY and KIKI take a last surf of Lightning Point's waves. ZOEY and KIKI will miss this place – and AMBER – when they leave for Lumina tonight with BRANDON.
In the cave Alisa and the Heirs have to face the five dangerous tests of humanity. But the closer Alisa gets to finding the Knot, the more of her friends she needs to leave behind. Will she be able to get them back and who will stop Dracula from untying the Knot first?
Erik is keen to get to know more about Ondina. She's not interested in spending time with a land boy. After accidentally transforming into a mermaid in front of Erik, Ondina is devastated.
The mermaids use a moon ring on Zac to investigate his growing connection to Mako. As a result, Zac has visions of an ancient merman chamber on Mako, which he goes to explore.
When Sirena insists that Mimmi and Ondina remove Evie's new mermaid tail, Mimmi reveals the astonishing range of her powers. She makes Evie morph in the cafe.
Sophie and Ryan damage the Moon Pool in their efforts to obtain the rare crystals. The girls improvise and use their own magic to prevent the impact of the comet.
Cleo discovers a comet is causing fish to flee the waters around Mako Island. The girls find a way to restart the message in the Moon Pool and discover the comet will collide with earth.
Don gets a second job at the Marine Park on the Pirate ship and outshines Cleo, threatening the future of her Dolphin show.
Bella's eager to ask Will to the end of year party until she sees him asking Rikki. A big misunderstanding occurs which prompts Will to express his true feelings for Bella.
AMBER, ZOEY and KIKI take a last surf of Lightning Point's waves. ZOEY and KIKI will miss this place – and AMBER – when they leave for Lumina tonight with BRANDON.
In the cave Alisa and the Heirs have to face the five dangerous tests of humanity. But the closer Alisa gets to finding the Knot, the more of her friends she needs to leave behind. Will she be able to get them back and who will stop Dracula from untying the Knot first?
Erik is keen to get to know more about Ondina. She's not interested in spending time with a land boy. After accidentally transforming into a mermaid in front of Erik, Ondina is devastated.
The mermaids use a moon ring on Zac to investigate his growing connection to Mako. As a result, Zac has visions of an ancient merman chamber on Mako, which he goes to explore.
AMBER, ZOEY and KIKI take a last surf of Lightning Point's waves. ZOEY and KIKI will miss this place – and AMBER – when they leave for Lumina tonight with BRANDON.