A full moon. A Halloween party at the café. The perfect chance for Zac to seize the Trident. The mermaids keep a close watch on Zac at the party, but with Cam's help, he evades them.
Zac finds a Moon Ring on the ocean floor and when he gives the ring to Evie, the mermaids know it's no ordinary ring. They have to get it back!
While showing off his brand new smart phone, Cam takes video footage of Zac swimming as a merman.
Bella's warned to back off from Will as he's on the trail of the girls' mermaid secrets. She gets too close to him and he finally discovers she's a mermaid.
Cleo defies Lewis' advice and experiments with the magic Moon Pool water. Using her powers, Rikki accidentally gets the water into Cleo's aquarium.
Rikki and Bella hide out at Cleo's to protect themselves from a full moon water attack. Bella's kidnapped by a water tentacle and taken to Mako Island.
A problematic family beach picnic leads Don to end his relationship with Samantha until Cleo encourages him to pursue it.
During an excursion to the circus, Christian's dad makes promises he's unable to keep, Tara tries to repair her friendship with Kat and Sammy goes public about his new romance.
The escalating conflict between the First and Second Years results in a showdown to determine which year has the greatest talent, and Tara becomes unhinged when Grace tempts her to get less serious.
The day before school Parents' Evening, Maddy, Tom, Shannon and Rhydian are helping Jana clean her caravan. Rhydian's Mother, Ceri, shows up. But it's not just Rhydian she has come to see. She tells Jana that her Father Alric has been deposed by the pack, making Jana the new Alpha. If Jana doesn't assume her destiny as heir, the pack will destroy itself as betas fight for control.
The class are Camping overnight in Aern Hollow before the orienteering task the next day. Liam has his ancestor's journal with him outlining how he found and tracked the werewolf he shot (ep 3). In their respective tents, Maddy, Jana and Rhydian use their wolfblood hearing to listen in, telling Tom and Shannon what they hear.
As student rep, Kara is in charge of organising tonight's school disco which she and the other K's are determined to make the coolest night of the year. Katrina is also excited because she thinks Harry Averwood is to be her date that night. The problem for our Wolfbloods is that there's no moon and all they want to do is sleep.
Rhydian, Shannon and Maddy catch Jana breaking into Shannon's locker before school. Jana defends herself she HAS to get Shannon's laptop to destroy the data. Maddy lands on Shannon's side but secretly, she and Rhydian know that Jana is right it's a ticking time bomb.
Smash is looking forward to 4 paid hours in a recording studio. Anala, who has been a jumbo-size pain for a while, takes Alex's guitar and transports her, first with and then without Kuru, to places she believed to exist only in a childhood dream. There she learns the elephant always protected her.
With BRANDON fully charged, ZOEY can't help but feel that BRANDON needs to know the truth about her. How can she be his girlfriend and keep lying to him?
Dracula heads for Transylvania before going to Hamburg to go after Alisa and her map, as Nicu and Lars try to stop him any way they can, putting their own lives in danger. Alisa and her friends are in deep trouble as they have been taken hostage by the Redmasks and will be sacrificed to the blistering sun.
When David invites Sirena to sing with him at the Ocean Café, their connection grows.
Now that he knows Sirena, Lyla and Nixie are mermaids, Zac begins to wonder about his school principal, Rita, and why she helps the mermaids. Zac quickly uncovers the truth.
The full moon is once again upon Mako and the mermaids have to stop Zac from getting the all-powerful Trident. But the full moon draws Zac to Mako.
Bella attempts to start a relationship with Will until she sees he's apparently got another girl.