KIKI and ZOEY are relieved to find out that half-Luminan BRANDON can't use the card properly. The only way they can be sure they are out of danger though, is to destroy the card.
Ivy sees Van Helsing secretly copying their map to the location of the Knot. Alisa is very troubled, but she and her friends need to find the last piece of the puzzle in the old burnt Vamalia-house first. Meanwhile Nicu and Lars learn Dracula wants to make a stop in Transylvania.
Sirena is collecting shells on the reef when she sees merman Zac. Luckily, she torpedoes away before he recognises her. But it's not enough - Zac saw her tail.
Fearing they'll never get the pod to return to Mako, a despondent Nixie finds herself at odds with Lyla and Sirena. Seeking solitude, she meets Ben, a young boy.
Against Nixie and Sirena's advice, Lyla helps Zac get to the Moon Pool. But when the Moon Pool entrance suddenly closes Lyla and Zac are trapped inside!
Will seeks confirmation of his first experience on Mako Island. Bella volunteers to misdirect his search so he won't find the Moon Pool.
Cleo and Rikki face their final year of high school without Emma. They make a new friend in Bella and meet new boy Will.
The full moon rises, and with the planets lining up, this full moon can remove mermaid powers for good. Cleo and Lewis are boyfriend and girlfriend again. Charlotte clashes with the girls, using her superior powers. When the girls come under another mermaid attack that night, Lewis lures Charlotte to the moon pool in order to remove her powers.
Cleo is having some problems on the home front keeping her secret about being a mermaid. Meanwhile, Charlotte gives Lewis an ultimatum about spending time with Cleo and the others. When Lewis struggles to fob Cleo off, Charlotte steps in and bullies Cleo with her superior mermaid powers.
Whilst recovering from her broken back, Tara discovers a hidden side to Ben who is volunteering in a hospital leukaemia ward performance and Kat tries to settle into First Year.
Tara risks serious injury and possible expulsion to compete in the Prix de Fonteyn Preliminary Round, and Kat is on top of the world when she's allowed back into the Academy.
It's election time for student rep on the school council! Jeffries doesn't expect anyone to be interested but Jana, now determined to be pack leader, throws up her hand. Maddy does too in retaliation. The Ks don't want either girl being their rep so Kara puts herself forward. Jimi can't bear the thought of all this girl power and volunteers himself as candidate.
Maddy is in a mood now that Rhydian has moved out. Her parents are taking her, Shannon and Tom for a day in Blackpool to cheer her up. They stop at small garage called The Mottled Poppy to fill up and get directions. A white poppy on the counter changes colour when Daniel stands next to it and the owner, Bob Driscoll, seemingly friendly, excuses himself and leaves to make a sneaky phone call.
Jana, on her way to school, is surprised by Alric. Far from being terrified she flings herself into his arms. Jana hadn't been banished from the pack at all. Alric had sent her in to lure Rhydian into coming back with her. She has taken too long. He wants all three of them to return by the end of the day. In school, Tom is humiliated by Jimi showing off his judo in the gym.
It's a lunar eclipse, and Jana is bursting with excitement! This is the ultimate night for Wolfbloods, one where their wolf and their human are finally at one. They become a wolf on the inside, whist remaining - for an hour - human on the outside, apart from veining and yellow eyes. It's a buzz! Jana invites Rhydian to spend the eclipse with her on the moors, but Rhydian isn't sure.
Marcus and Alex want to exchange one month together-gifts. Alex just asks Kuru's wise advice, but Marcus left the choice to Amanda. Kuru generously gives her one the royal Manjipoor coins she admires. Amanda tricks sweet-tooth Anala into transporting her to Manjipoor to buy a diamond necklace.
BRANDON and ZOEY are closer than ever and are keen to spend as much time together as possible.
As Alisa fights to steer the ship through the dangerous storm, the Spark shows Alisa how ruthless Dracula can be to get all his Rubies. Below deck Ivy and Inger find that Anna's notebook reveals that Alisa is the very last one to get the Spark. Alisa needs to do what she is destined for She has to untie the Knot, not go after Lars and Nicu.
While listening to Sirena sing, Lyla has an idea. If Sirena sings the Enchantment Song to Zac, he'll fall under her spell and they'll have the chance to take his powers.
It's a full moon and the mermaids think that if they keep Zac out of the moonlight, he'll lose his powers and return to his land-dwelling self. Then they can return to their pod.