Rikki comes to stay at Emma's house and stirs up the family unit by messing up the order of things. In trying to compete with Rikki, Emma tries to rebel and throws a party. Meanwhile Lewis wants to know why Cleo broke up with him concerned that he's not masculine enough for her.
Zane's back in town and still in love with Rikki. Although he believes she's not a mermaid anymore, things are still tense between them. Rikki assures Emma she can handle Zane they broke up and that's all there is to it. As Zane continues to try to win Rikki's affections, he realises she's still a mermaid and saves her from the threat of discovery.
Cleo uses her mermaid powers to avoid a sprinkler and inadvertently splashes Charlotte, the new girl at school. Lewis and Charlotte meet and it's clear she likes him straight away. With the girls' mermaid powers turned up to max, Lewis tries his best to help but his attempts only cause Cleo to feel crowded by him.
Emma, Rikki and Cleo are teenage girls with a secret - they're still mermaids. They're handling life pretty well but the threat of the full moon, and the strange effects it has on mermaids, looms. This time Lewis is certain he can help but things go awry and the girls are moonstruck.
Tara finds a new hero in Saskia Duncan, the youngest principal dancer in the Company's history, and a new worry about her future with Christian. Meanwhile Abigail searches for dirt to remove talented Grace from second year.
Tara reunites with her friends for second year at the Academy and discovers the exciting news that they can compete in a prestigious ballet competition to determine the best young dancer in the world.
Animals have been going missing around the village and Shannon thinks that the beast is back. Instead of having their movie night, she wants them to all go beast hunting. At first Maddy isn't keen to go, wanting a wolf free night, but when Shannon tells Maddy that her mum is sending her to a psychiatrist because of her beast fixation, Maddy agrees to go.
When there is no moon, wolfbloods become lethargic and are stripped of their powers. Tomorrow is no moon and Maddy and Rhyidian aren't looking forward to it! Stuck in detention, mischievous Maddy decides to have some fun and gets Rhydian to join in. Whilst Mr Jeffries slips out they take the school trophy and hide it on the school roof - Maddy accidentally cuts herself whilst doing this.
Kuru warns Alex the powerful royal rune to shift time back in order to change things has only been used twelve times for extreme emergencies. Reasoning one wouldn't know if the royal user doesn't tell, the scamp keeps abusing it for petty accidents all day when Marcus finally asks her on a real date.
Many weeks after the boat was discovered in the cane field, no clues have been found and no further message from Lumina has come.
A remark at mother's day from her sanctimonious sister Zoe that Alex is adopted makes her wonder about her magical biological mother, queen Nefari. After Kuru says Omar knew her best, she travels to Manjipoor alone to question him. Vashan spies on them and magically set a trap, entering the queen's magical posthumous vision.
KIKI and ZOEY are anxious – with no reply from Lumina and LUCA knowing who they are, they're no longer safe in Lightning Point.
Alisa needs both Nicu and Lars to get to know the Redmasks' plans. The other heirs train to form a strong front. It takes the clan leaders some time to get used to this new status quo on the ship. It takes the support of the Conte to convince the other clan leaders to do it their way. Nicu has to come face to face with his greatest nightmare. The race to the Knot is on.
Weilan reveals an Eastern mermaid power called ‘Turn the Tide' and Zac thinks he can use it against the dragon. Evie discovers Zac and Weilan practising ‘Turn the Tide' in secret.
Mimmi is asked to help Karl at the marine park and must hide her true identity from him. When she realises a new dolphin is about to give birth prematurely, she has to convince Karl to help.
The mermaids come up with a plan to trap the dragon inside a Chinese puzzle box that they get from Uncle Shen, a kindly antique dealer in the local markets.
Dr Denman has discovered the girls' secret and trapped them on Mako Island. Their only chance to avoid being exposed is to use the lunar eclipse to give up their powers forever!
The return of Dr Denman means trouble for the girls. Meanwhile, Emma is having family dramas of her own. With Zane's unwitting help, Denman's research at Mako Island uncovers the girls' secret!
Lewis thinks he's found a way to control the girl's mermaidness. The school dance brings all our heroines' ‘boy issues' to the surface.
The girls discover a necklace for sale identical to Miss Chatham's. Miriam causes a stir by buying it - then throwing it in the water. Rikki faces a choice whether to take the necklace and reveal her mermaidness to Zane.