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!
Tara returns from the holidays excited to have been awarded the first year scholarship. However, this soon turns to disappointment when Kat leaves her standing alone outside a warehouse party the night before their first ballet class.
It's Open Week at the Academy and Tara discovers she is embarrassed by her unsophisticated parents, especially around her new boyfriend Ethan. Her mum later reveals that the farm is in serious financial trouble.
With a Dark Moon looming the pack is fraying at the edges and Selina's alter-ego is uncovered.
TJ tries to help Selina with a problem that threatens to expose her as a wolfblood.
After Kuru reports Alex still doesn't concentrate on her magic training, Omar invites her. The elders decide to hold a banquet, Vashan prepares a snake venom-drink. Alex misses the appointment because she prefers to play with her band in a talent competition they only make trough her magic abuse.
When ZOEY escapes the washing up to recharge her energy, AMBER and KIKI think nothing of it – until a big burst of lightning strikes their house. Rushing upstairs, they find ZOEY gone.
Overflown with emotions Alisa has to confide in Lars and Ivy about what is going on with her. Inspired by the openness of Alisa, Ivy tells her about how she and her brother Seymour ended up on the ship. They know Tonka is on a mission to steal the rubies. Hindrik sends Raphaëla to check if the rubies are safe. They're not. Raphaëla gets into a fight with Tonka.
Jana's uneasy relationship with Imara is tested on a mission to find a dangerous wolfblood.
An emergency from the wild pack forces Jana into an impossible position.
Alex still puts her teenager life above royal duty. Yet Manjipoor cheerfully awaits her return. Vashan and his servant Diva only pretend approval. Kuru visits Omar, who reassures him time should help.
LUCA and KIKI have been growing closer and AMBER is sick of being stuck in the middle! Finally, LUCA asks KIKI out on a date – and KIKI can't wait.
Alisa and Nicu are in a police cell and Tonka burns the book on Dracula. Conte Claudio learns about the waitress that has been bitten in town. Contessa Viola goes to see if she can find this vampire, the Conte checks if all the heirs are on board and if no one has been drinking human blood. Lars sacrifices himself to get Alisa back on the ship without the others noticing. Alisa is thankful.
Ondina doesn't want to choose between Erik and the pod when the pod returns. To cheer her up, Erik decides to throw a party in the café. But hiring the café is expensive.
On the night of the full moon, Zac and Ondina sneak away to Mako. Veridia has made a deal with Ondina to destroy the chamber. Zac is in the process of activating the chamber.
Mimmi takes a job at the marine park where she meets CHRIS, a young man who is desperate to get into a dolphin training program.
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.
Emma and Cleo find out Zane and Rikki are an item and force her to choose - him or them. When Zane appears to side with Harrison over the Mako island development Rikki's decision is clear. Now it's Zane's turn to make a choice.
Zane thinks Miss Chatham holds the key to the sea monster. Emma needs a change so dyes her hair red. While Zane gets closer to the secret, he also gets closer to Rikki. Zane dives to Miss Chatham's boat and sees a mermaid!