The girls discover the Mako crystals contain immense energy and need to mount a rescue mission when Zane jealously steals one in an effort to gain Rikki's attention.
Zane installs Sophie as head of staff at the cafe. Bella develops a sneezing allergy that also accidentally triggers her powers.
Will competes in the Free-Diving Championships but afterward chooses to break from the sport and shrug off Sophie's influence on his life.
Sammy decides to alter his Prix de Fonteyn solo one day before the start of the International Round, while Tara encounters a new-old nemesis in the girls' competition.
Ben tries a variety of tactics in rehearsals for ‘Peter Pan' to prove to Tara that he's a leading man, while Kat's efforts to research her character in the production lead to a realisation about her relationship with Christian.
Rhydian is reunited with his father – but why has he really come? And why is Dacia so interested in him and the wild Wolfbloods?
Protecting Rhydian, Tom is accused of poaching so Shannon becomes his romantic alibi.
Assumming their and Manjipoor's world are literally on different frequencies, JB tries super-amplifiers. Kuru and weakened Alex indeed return to the kingdom, where the people is in doubt who to obey. Alas after they shred the abdication papers Diva puts up a devious fight.
An unexpected arrival puts Rhydian's leadership skills to the test in a matter of life and death.
Rhydian, Shannon and Tom face a new future – and an old foe.
Just when Vashan prepares for his coronation, he discovers Diva has magical powers, but too late: she throws him in the dungeon. When Omar and while he flees Kuru find out, she tries to kill them, but Anala saves them by transportation to the Wilson home. Alex uses magic to cure Omar's wound.
BRANDON is so excited by his alien energy that he starts to recharge – way too often.
Alisa and the Heirs have no choice but to team up with their greatest enemy to face the crazed Van Helsing. It's the only way to get Malcom, Joanne and their map back. They will have to come up with a plan of attack, but Van Helsing is setting a trap of his own. Inger helps Ivy to try and control her new discovered powers.
For the first time, there are no secrets or differences between Zac and the mermaids.
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!
Rikki fears Ryan's explorations on Mako Island will uncover their secrets but Cleo and Bella discount her concern.
Cleo's introduced to Ryan, a young geophysicist who's working for Samantha. Rikki doesn't react well to Cleo consulting Ryan about the Mako rock and a fracture begins to appear in the trio.
Rikki's frustrated by the water attacks and goes to Mako Island on a full moon to confront the strange force in the Moon Pool.
Sophie uses Bella's idea for a fundraising concert and presents it as her own to Rikki to gain publicity for the cafe.