Sammy and Christian have made a pact of brotherhood – from now on they are an island of man – but Kat wonders whether Sammy might have a man crush on his new best friend.
Christian is ready for his court date but everything unravels when old loyalties cause him to change his story. Kat is shocked to learn her brother is moving overseas.
Maddy's got her exams coming up, but she isn't feeling very well and is grouchy - her first change is coming... Tom reminds her she forgot to help him with his English revision for the exam tomorrow and she promises to make it up to him at break but at break she is struggling pre-change and Rhydian takes her for a run to blow off steam.
It's the school art exhibition and the theme is family. Rhydian puts up a picture of a lonely boy, with silhouettes of parents in the distant background. He storms out when the 3 Ks comment on it. Tom has put up loads of pictures of him and his dad at football matches, he is excited that his dad is coming to the exhibition.
Kuru accidentally breaks JD's cymbal, but pays for it with a golden coin from Manjipoor worth the eightfold, which he spends on flashy clothes. The Wilsons see Kuru gets rewarded too. When Alex flippantly calls his allowance excessive, he dutifully begs the council to reduce it, which is nearly considered treason for questioning one of its decisions.
When a storm is forecast to hit Lightning Point, ZOEY and KIKI know it's time – they can send a signal through the lightning, via the energy field and back to Lumina.
On the Elisabetha Tonka wants to snatch the Nosferas ruby from the Contessa's neck. When Alisa gets back from town, she finds her friends in danger. She wants Tonka to take her instead of her friends. The Contessa promised Alisa's mother to keep the Spark safe and tries to protect her and the other heirs. The Redmasks are coming. Alisa tells Lars she knows and trusts him.
When Evie's Dad tells her to clean the house, Evie uses her moon ring to make a mop clean automatically. But the mop goes haywire and attacks Evie with water.
Zac fails a biology test and persuades Weilan to use magic on him to help him pass the next one. Zac suddenly knows all the answers – but Weilan is stumped.
When the Eastern mermaid Weilan frees one of Ondina's little mermaid students from a net, Ondina and Weilan clash. On the night of the full moon, Joe and David go fishing in open water.
Zac and the mermaids are determined to stop Erik from controlling Mako. As the full moon nears its zenith, the merman chamber draws the water from the moon pool.
Erik learns that the trident stone still exists. It's the missing element needed to activate the merman chamber. Zac retrieves the stone and gives it to the mermaids for safekeeping.
Under the effects of the full moon Rikki goes crazy, boiling dry everything. She runs away to Mako where she meets Zane and kisses him.
A rainy day traps the girls inside. In an effort to "play sick" the girls create a situation where their families become part of a dire medical emergency.
A dolphin at Sea World will only eat from Cleo's hand and when she has to sneak out to feed him, everyone thinks she has a boyfriend.
Emma is put in charge of managing the juice bar. Miriam decides to cause trouble and cuts the power to the cool room, then is unwittingly frozen by Emma who uses her powers to fix the freezer. Will the girls be able to thaw Miriam out?
ZOEY is sick of waiting and decides to take charge of finding a way home. Back at the cane field, ZOEY and AMBER test out the energy field one more time.
Calvina wants Nicu to join her to a Redmask meeting. Reading her mother's words Alisa's world changes she's warned never to trust a Dracas. Lars wants to prove he can be trusted even if he's a Dracas, but Alisa needs some distance and goes into town. The clan leaders find out that Dracula is alive. While Malcolm teaches the class about his power - controlling the weather - things turn into chaos.
When the Eastern mermaid Weilan frees one of Ondina's little mermaid students from a net, Ondina and Weilan clash. On the night of the full moon, Joe and David go fishing in open water.
Zac and the mermaids are determined to stop Erik from controlling Mako. As the full moon nears its zenith, the merman chamber draws the water from the moon pool.