On the night of the full moon, the pod plans to attack the dragon by conjuring a massive lightning storm. Weilan realises the dragon is Nerissa trapped by a spell.
While at the ‘Secrets of the Deep' book launch, the mermaids realise that a bracelet on display is the key to destroying the dragon, according to the Legend of Jiao Long.
A spell goes wrong and turns Rita into an old woman. The mermaids rush to find a cure so Rita can attend a school board meeting to decide whether she or Ms Trumble is Principal.
Emma starts acting very weird after pricking her finger on a mysterious barb of coral, suddenly becoming ravenous for things like anchovy flavoured fish food! Cleo's fish, Hector, exhibits the same behaviour. As Hector begins to look very sick, Emma turns into a mermaid at the marine park, swimming about in front of the glass in the viewing area.
Zane hears of treasure under the ocean and enlists Rikki to help find it, after all a mermaid can search the bottom of the ocean pretty fast. Rikki is reluctant until she discovers her dad is having trouble paying the bills - and they might be forced to move. Rikki gets Emma and Cleo to help, but conceals her true reasons for wanting the treasure.
Cleo is failing at school. Lewis waits for Cleo to ask him for help, giving Charlotte an idea - she volunteers to help tutor Cleo! Cleo is horrified but is forced by Don to accept. Charlotte takes the opportunity to set Cleo mountains of homework keeping Cleo busy so she can have Lewis all to herself. Charlotte pressures Lewis to take her to Mako Island so she can sketch some landscapes.
Elliot is going to horse riding lessons and Emma is cornered into taking him. Emma meets Ash - a handsome horse riding instructor. They clash immediately. Emma tries to prove herself and goes too far. When a horse falls ill Emma must use her powers to fix the situation. Meanwhile, Lewis asks Cleo to accompany him to a formal awards night in a limo.
Sammy's little brother Ari arrives at the Academy, throwing Sammy's hectic schedule into havoc and Kat auditions to be a football cheerleader, happily encouraged by Ben. Meanwhile Tara is having self esteem issues when it comes to the looks department.
Ethan clashes with Abigail in his attempt to create a spectacular dance performance for Showcase, while Tara finds it hard to compete with Christian's old friend Kaylah.
It is the day of the full moon and Maddy and Rhydian aren't looking forward to a night in the den. Rhydian tries to talk Maddy into escaping, but Maddy knows she can't - her parents would be furious! Shannon has been trying to forget about the beast by throwing herself into other interests.
Rhydian is dabbling with his Eolas powers in school, showing off to his school mates. Maddy can't understand how he is doing it, the tricks go beyond Wolfblood senses and speed. Rhydian shares his secret with Maddy. It's something his mum taught him, Eolas, which wild wolfbloods use to connect themselves with nature.
Maddy, Rhydian, Tom and Shannon are playing in the woods when Tom notices someone spying on them. Maddy and Rhydian catch their scent - the wild wolfblood is back... Bernie, who owns the local village shop, fills them in about a homeless women who has been sleeping rough in the woods.
It's the night before full moon and Rhydian is spending a practice night in the Smith's den. The next day on their way to school Maddy and Rhydian sniff out some stolen goods -Sinclair gear hidden in the woods! They take a few t-shirts for themselves, Tom and Shannon. Shannon doesn't want a t-shirt as they aren't ethically made, but the 3 Ks overhear and start bartering for the spare t-shirt.
Kuru tells Alex that Anala's birthday is a grand state affair in Manjipoor, where the elephant chooses one subject to be granted a wish. She offers to his and Omar's delight to preside over the palace party. Told it's invitation only, she magically fakes invitations for her friends and even a few Manjipoor commoner market acquaintances.
AMBER is totally excited when her crush, JOSH has noticed her at school. She's doubly excited when he asks her to help organise a Hawaiian fundraiser party for his basketball team.
The ship is speeding for Norway Alisa's decision to free Calvina has turned for the worse. Alisa is to appear before the Elders to be held accountable for her actions. Nicu has to prove he can lead an army of Redmasks to serve Dracula. When they arrive in Norway, Lars hurries to the Noaidi. There they find that Alisa is the only one who can help Baron Magnus fight the silver in his body.
Mimmi and Zac share a vision of their mother Nerissa. Although Weilan says the water dragon killed Nerissa, Mimmi thinks she may be alive.
Chris and Mimmi go on a date. Ondina tails them and stops Chris from kissing Mimmi by wetting her so that she bolts and cloaks. Weilan helps Ondina realise she's afraid for Mimmi.
During a lesson on Mako Island, one of Ondina's little mermaid students, Amaris, goes missing. Chris and Karl come to the island to survey the turtle population.
Riding their dirt bikes, Zane and Nate stop in a trailer park to look at a classic Harley. Nate steals a badge from the bike and Zane is busted by the owner - little does he know it's Rikki's dad. Later, embarrassed by her family's financial situation, Rikki hides where she really lives from Zane. Rikki has to overcome her shame about her background and introduce her dad to Zane.