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.
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Behind Sirena and Lyla's backs, Nixie helps Cam get into the Moon Pool to unlock the Trident. But Evie insists on coming along for the dive.
For the first time, there are no secrets or differences between Zac and the mermaids.
Emma and Cleo help Lewis catch a huge fish in the fishing competition leading the judges to suspect he's a cheat. Meanwhile Zane and Rikki are stuck together on a balcony of a fancy hotel where after much argument, they kiss again.
Cleo and Kim are fighting like crazy and Cleo is pushed to breaking point. Then cousin Angela comes to stay and things just get worse. Cleo realises there are more challenging things than an annoying sister.
Under the effects of the full moon Rikki goes crazy, boiling dry everything. She runs away to Mako where she meets Zane and kisses him.
A rainy day traps the girls inside. In an effort to "play sick" the girls create a situation where their families become part of a dire medical emergency.
Realising that Saskia's continuing critique of her dancing could jeopardise her mid-year exams, Tara takes action, while Christian ditches his pas de deux exam to hang out with Kat. Wired on energy drinks, an overtired Sammy kids himself that he's blitzing exams, and puts Abigail in danger as a result.
Tara's concern about the time she spends with Christian impacting her dance study leads to her to suggest they ‘pause' their relationship, and Ben tries to impress Kat through an ambitious choreography assignment. Meanwhile Grace has cause to be jealous when Abigail and Ethan continue to work closely together.
Jana and Imara run into familiar faces as they track Hartington. Selina competes in the taekwondo fight of her life and in doing so makes an unlikely ally. Jeffries laments the end of his career.
The pack investigate the Segolia Vault and in doing so find the precious Dawnus Torc which takes them on an adventure like never before. TJ falls sick with a mystery illness.
The band bunch prepares for the school's masked dance, an concept unknown to Kuru. JB was turned down by 48 girls, so he's desperate to ask Kosma on the Manjipoor market and tricks Alex to take him there, supposedly looking for her perfect dress, behind Kuru's back.
LUCA is finally letting his guard down with KIKI again – and soon they're back to their old friendship.
Alisa wants to go after Lars and free him from his uncle. But first Alisa, Ivy and Inger need to save the other Heirs from the sun and hungry jaws surrounding them. Calvina is released from her prison as the Heirs need all help they can get trying to get Lars back. Alisa learns that the hooded stranger is the key to finding out where Ragnar has taken Lars and the Rubies.
Zac's continued search for the Trident has Lyla worried. Although she hid it well, Zac manages to find the Trident. But Lyla is right behind him.
When Rita's Cat, Poseidon steps through a puddle of mermaid powders, he is transformed into a person. A girl - identical to Evie!
Sirena's sister Aquata returns to Mako with wonderful news – Sirena can return to the pod! Unfortunately, the invitation isn't extended to Lyla and Nixie.
A dolphin at Sea World will only eat from Cleo's hand and when she has to sneak out to feed him, everyone thinks she has a boyfriend.
Emma is put in charge of managing the juice bar. Miriam decides to cause trouble and cuts the power to the cool room, then is unwittingly frozen by Emma who uses her powers to fix the freezer. Will the girls be able to thaw Miriam out?
Cleo's dad plans an embarrassing surprise party for her birthday so she escapes to Mako Island. Zane and Lewis almost spot her there on their expedition to catch the sea monster.
When the mysterious old woman's boat and home is declared unseaworthy Emma invites her over to stay. Zane gets trapped on the sinking boat and Emma tries to save him.
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