BRANDON is finally ready to learn who he truly is. As ZOEY speaks to him, she becomes more and more convinced that BRANDON has secrets locked inside his memories.
The race to the Knot has begun. Dracula has a head start, but the Heirs are catching up! On their way reality sinks in after they solve the five tests and Alisa unties the Knot, they‘re all going to be human again, meaning some of their own will be lost forever. The Spark lights up and shows Alisa they might already be too late.
Two young mermaids, Ondina and Mimmi, run away from the Mako Island pod with Sirena to try to turn the merman ZAC back into a land boy. But Zac's connection to Mako is growing stronger.
It's a full moon and Nixie doesn't trust Zac to stay away from the Trident.
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.
The girls sit their final school exams and have to avoid a water attack in public when the full moon rises early.
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.