Mako Mermaids

Three young mermaids (Sirena, Nixie and Lyla) are asked to protect Mako island (their home) and to keep humans, or as they call them land people, away during the night of a full moon. However, 2 boys (Zac and Cam) decide to camp on the island. When the girls neglect their duties, something unexpected happens to one of the boys which will cause a lot of trouble for them.

The three mermaids decide that the only way they could find a solution to "fix" Zac is to have legs. Their legs would allow them to walk on land and use their powers on him when he least expects it. The girls soon realize that having legs is quite different than having a tail. They must get use to this new world they never got to experience before.

The girls follow Zac to school and attend the biology class. They try to take his powers in middle of classes but fail, so out of frustration Lyla uses her powers to spring some fountain water on Zac to get him wet. They are taken to the principal office where the principal Rita takes the Moon Ring from Sirena claiming that she stole it. Sirena is desperate to get it back and they follow Rita home where they make a discovery.

Lyla is at the JuiceNet café and she accidentally gets herself splashed. She has to quickly find a place to hide from the people around. She decides to go into the cool room. While trying to use her powers to dry herself, she breaks the cooling system. Finding it strange that the temperature in the cool room is low, David must inspect the situation. Sirena comes just in time and must find a way to keep everyone from seeing Lyla in her tail.

The girls have been cast out for a long time, but now they have to wait longer because it is a rainy day. Lyla, stubborn as she is, has the idea to use Sirena's moon ring to change the weather so they can walk on land without the rain being an issue. When they use the moon ring, it made things all worse. Snow starts to fall and the girls become sick from "snow rash".

The girls decide to befriend Zac in hope of getting him to tell them about his powers. The girls then hope to convince him that they can help him get rid of his powers. Meanwhile, David and his brother, Joe, take a ride in a new boat. Their fish finder locates an unusual sea creature under them – it is Nixie taking a swim. As Nixie tries to swim away, Joe decides to chase it down and discover what the creature is. When Nixie becomes tangled in a fishing net, she is cornered until Lyla, Sirena, and Zac (believing it is a dolphin), find a way to rescue her.

A full moon is approaching and Zac's father has planned their annual camping trip to Mako Island. Cam and Erik are invited. While they are at Mako, the girls keep an eye on Evie who will go through her first full moon. However, Mimmi and Ondina are concerned about Zac being at Mako. They leave and make their way to Mako Island while Sirena has to babysit Evie.

The first full moon since Zac was transformed into a merman has arrived and the girls believe that complete isolation from moonlight will rob Zac of his powers. The girls convince Zac to give this a try. They help Zac cover up the windows to his home and stay over that night to keep watch over him. Despite the attempt, the full moon overpowers Zac and he is exposed to moonlight, drawing him to Mako Island. The girls follow Zac to prevent him from finding the Moon Pool. On the island, Zac heads straight for the cave he went into the night he fell into the Moon Pool. Luckily, the entrance to the cave closes before he can enter it. The next day, Zac shows the girls that he now has the power to turn invisible.

When Lyla hears Sirena singing, she has an idea. She asks Sirena to sing the enchantment song. "A song used by mermaids long ago to lure sailors into rocks" (Quote from Sirena). When they try to use it on Zac, the song accidentally affected David instead. Nixie, who was present when Sirena sang the song, is now stuck with David who fell in love with her thanks to the enchantment. They must find a way to snap David out of it.

Zac is determined to return to Mako Island and, against Nixie and Sirena's advice, Lyla decides to help him, believing if they can discover how Zac got his powers, they can learn how to take them away. Lyla guides Zac to the land entrance of the Moon Pool and uses Rita's Moon Ring to gain access only to have the entrance close behind them trapping them inside where a new mystery awaits.

Nixie becomes despondent when she realizes their pod may never return and isolates herself from Sirena and Lyla. At the pier, she meets a young boy who refuses to go sailing with his parents. Nixie inadvertently causes the boy to run away after giving the boy advice to "look after yourself". Feeling guilty, Nixie looks for the boy herself and reveals to him that she is a mermaid to get him to want to explore the world. She also gives him Sirena's carved shell and asks him to throw it into the ocean in hopes it will get to Sirena's sister, Aquata. Meanwhile, Zac learns that the object he saw on Mako Island was a trident and does some research on it. Rita warns the girls about the trident's destructive powers.

Nixie and Sirena don't share Lyla's concern about Zac finding the trident and instead shift their focus to solving their financial crisis, with Nixie arranging for Sirena to sell her handmade bracelets at the café. However, while out collecting shells, Sirena has a close encounter with Zac who gets a glimpse of her tail, igniting his interest in the waters around Mako Island — a curiosity the girls worry could lead him to discover the entrance to the Moon Pool. Zac's friendship with Lyla continues to be an issue for Evie.

The full moon returns and thus the trident will be within Zac's reach. Lyla is desperate to prevent Zac from getting the trident and harming, or even killing, himself. Cam warns Zac about putting too much trust in three girls whom he hardly knows but Zac refuses to listen to him. That night, Zac tries to resist the pull of the full moon, but is unsuccessful. He races to Mako Island to get the trident, with the girls in hot pursuit. Zac grabs the trident, turns around, and is shocked to see the girls in their mermaid form. Lyla tries to take the trident from Zac, believing it may harm him, but accidentally causes the trident to activate and throw everyone out of the portal. Zac has snapped out of the moon's spell, but is furious that the girls have been hiding their true identity from him. Feeling profoundly betrayed and believing that the girls are trying to take the trident for themselves, an angry Zac ends their friendship. After apologizing to Cam, Zac is now even more determined to get the trident.

Now that he knows Sirena, Lyla, and Nixie are mermaids, Zac starts to wonder why his school principal, Rita is helping them. This brings him to suspect that she may also be a mermaid. Meanwhile, Rita begins giving the girls lessons on how to use their powers. During a teacher-parent conference concerning his grades, Zac notices Rita's great caution around water, confirming his suspicion that she is also a mermaid. With this knowledge, he decides to use it to his advantage. With her cover blown, Rita tells the girls she must leave town before Zac exposes her. The girls decide to fight back by using their powers to disrupt Zac's life and nearly expose him in front of Evie.

As David and Sirena's relationship continues to grow, Nixie and Lyla are concerned that Sirena won't want to return to the sea and their home pod. Using a new ability taught by Rita, Nixie sabotages Sirena's singing audition at the cafe by manipulating her voice and humiliating her in front of everyone. Zac witnesses the whole scene and becomes angry that the girls have wrecked the audition and, in the process, destroyed a figurine he gave to Evie as an anniversary gift. To get back at the girls, Zac uses the same ability to help find David a new replacement singer. But when Evie tells him that David actually wanted to sing with Sirena all along, Zac changes his mind. Meanwhile, Nixie and Lyla regret what they have done to Sirena and apologizes to her. They return to the cafe where Sirena ends up singing with David after the two admit their feelings for each other and share a kiss.

Cam buys a new phone and tests its camera by filming Zac swimming as a merman. Later at the cafe, Cam takes some unwanted pictures of Nixie, annoying her and causing her to throw the phone aside and it gets lost somewhere in the cafe. Zac, Cam, and the mermaids are forced to put aside their differences, and work together to find the phone before someone else finds it and sees the video of Zac as a merman. In the process, Cam and Nixie grow closer together. Although they succeed in preventing anyone from seeing the video after Nixie destroys Cam's phone, Zac makes it clear that this reluctant alliance changes nothing between them.

Zac finds a seemingly ordinary ring on the ocean floor and gives it to Evie as a gift. But when Sirena sees the ring, she realizes it is a Moon Ring. The girls warn Zac about the ring's great power and convince him to get it back from Evie. However, Zac still does not trust the girls and has no intention of handing the Moon Ring over to them. Zac, Evie, Cam, and Rita all attend a lunch hosted by Zac's parents. The girls crash the lunch hoping for an opportunity to recover the ring. Zac manages to get his hands on the ring first. While Zac and the girls fight for possession of the ring, they accidentally zap Rita with the ring's magic, knocking her unconscious. In the process, Lyla manages to snatch the ring from Zac. They must now get Rita to the ocean to revive her before Evie and Zac's parents realize what’s going on.

It is the night of the full moon and Cam and Zac develop a plan to take the trident. Since the full moon happens to be on the same night as a Halloween party which Zac is attending with Evie, he also has to figure out how to slip away from the party without Evie becoming suspicious. Sirena, Lyla, and Nixie volunteer to work at the party to keep a close watch on him. When the full moon rises, Zac successfully resists its pull and is in complete control of his actions. Zac attends the party and, later that night, slips away and heads to Mako Island with the girls pursuing him. However, with Cam's help, Zac evades the girls and finally gets possession of the trident.

Zac finally has possession of the trident, but doesn't know how to activate it. While at school, Zac sees Rita and realizes she may know something about the trident. To get access to Rita's house, he convinces Evie and David to interview Rita at her home for the school magazine. During the interview, Evie becomes suspicious that Rita and the girls are hiding something from her and begins asking them probing questions. Zac, realizing that Evie is getting too close to his and the girl's secret, abruptly ends the interview before Evie can find out more. While David photographs Rita and the girls, Zac searches the house and discovers Rita's secret grotto. Later, he sneaks into the grotto through the underwater entrance with the trident in hand to check it out properly. The girls confront Zac in the grotto and inadvertently charge the trident when it suddenly begins absorbing energy from Sirena's Moon Ring. Zac escapes with the trident and returns home to experiment with its powers.

Zac takes the trident to school and hides it in his locker, hoping to keep it safe from the mermaids. Realizing that Zac has taken the trident to school, the girls show up at school to search for it. Rita talks to Zac about the trident, telling him its more than just a weapon and that he must return it to Mako Island. However, her refusal to go into details only makes Zac more curious. Rita is forced to cut the conversation short when she unwittingly gets too close to the trident, causing it to activate on its own and drain her energy. When Zac sees the mermaids at school, he ditches class and takes the trident to a warehouse. Evie notices Zac's strange behavior and also sees the girls searching for Zac, causing her to become more suspicious of them. Later, Cam unwittingly leads the girls to the warehouse where a fight for the trident ensues. The girls, however, prove powerless against the trident and are forced to retreat. Afterwards, Rita reveals to the girls that if the trident is taken into the Moon Pool during a full moon, it will destroy the Moon Pool, the source of all mermaids' powers.

Sirena's sister, Aquata, returns to Mako Island with good and bad news. She reveals that Sirena is now allowed to return to the pod, but Lyla and Nixie are still banished. Though Sirena is reluctant to leave her two friends, they both insist that she go. Meanwhile, Zac discovers the underwater entrance to the moon pool and confronts Lyla and Nixie, demanding they tell him about the trident's connection to the moon pool. When they refuse, he threatens to take over the moon pool. The next morning, Sirena leaves with Aquata while Nixie and Lyla confront Zac at his home. Another battle ensues with the two girls finding themselves overpowered once again. However, Sirena returns just in time to knock the trident from Zac's grasp. Lyla, seizing her chance, swims off with the trident and hides it in a small opening in the rocks. Afterwards, Sirena decides to stay with Lyla and Nixie rather than return to the pod.

When David delivers a seafood order to Rita's house, Evie, who is still suspicious of the girls, tags along hoping to find out more about them. Meanwhile, Rita's cat, Poseidon, becomes magically enchanted after stepping through a puddle of spilled potion. After encountering Evie, who was snooping around the house, Poseidon transforms into an exact duplicate of Evie but retains the mind and instinct of a cat. David mistakes feline Evie for the real Evie and takes her back to the cafe. Later, feline Evie goes to the beach with Carly where Cam notices her odd behavior and calls Zac for help. While searching for Poseidon, the girls run into Zac and "Evie" at the beach and eventually realize what has happened. Lyla helps Zac keep the real Evie and Poseidon apart while Nixie and Sirena work on a way to restore Poseidon to cat form.

Rita begins giving the girls lessons on how to use the Moon Rings. Meanwhile, Zac is searching the reef for the trident and recruits Cam to help him find it. When Lyla goes to check on the trident, she sees Zac retrieving it from its hiding place. As Lyla tries to take the trident from Zac, a bolt of lightning jumps out from it and strikes her, knocking her unconscious. Horrified by what he's done, Zac picks up Lyla and brings her to Rita's grotto, leaving the trident for Cam to bring back to shore. Sirena, Nixie, and Rita attempt to use their Moon Rings to heal Lyla, but this fails when the rings run out of magic. Rita realizes that their only hope of saving Lyla rests with using the trident to recharge the Moon Rings. Zac retrieves the trident and brings it to them despite Cam's protests. He recharges the Moon Rings, which the mermaids then use to heal Lyla. After recovering, Lyla tells Zac about the trident's ability to destroy the Moon Pool. Zac finally realizes how dangerous the trident truly is and returns it to its resting place on Mako Island, ending his feud with the mermaids. However, Nixie is unsure if Zac can be trusted to let it remain there.

Cam becomes angry at Zac when he learns that Zac has returned the trident to Mako Island. When Zac admits to Rita that it is not easy living a double life, she invites him to join her magic lessons alongside the girls. The girls tell Zac that he must give up his powers in order for their pod to return, which they believe is possible by having Zac in the moon pool during a full moon. When Zac expresses his reluctance to give up his powers, Sirena and Lyla place their trust in him and decide to give him time to think about it, acknowledging how significant their request is. Nixie, however, refuses to trust Zac after all the trouble he caused them, causing a rift between herself and the others. Later, Lyla spends time with Zac, teaching him about the ocean and mermaid history. Meanwhile, Cam earns Nixie's trust by keeping her secret safe after she is splashed at the cafe. Afterwards, Cam tells Nixie that he also wants Zac back to normal and offers to help her. Tension between Nixie and Lyla only grows when Lyla proposes the radical idea of having Zac join their pod. Nixie's opposition forces her to turn to Cam, the only person she can trust.

The stress of living a double life nearly causes Zac to admit to Evie that he is a merman. Rita and the girls try to console Zac, telling him that being in the Moon Pool during a full moon will turn him back to normal, but he is still worried. Lyla again suggests letting Zac join their pod, but eventually agrees that returning Zac to normal is the best thing for everyone. Meanwhile, Cam lies to Nixie, telling her that Zac wants the trident back and offers to help her move it to a secure location. Cam borrows some diving gear from Evie but reluctantly agrees to let her come to Mako Island with him so she can discover the reason for Zac's odd behavior. On the island, Nixie opens the cave using one of Rita's Moon Rings, allowing Cam and Evie to enter the underwater realm. Cam retrieves the trident but with Nixie's ring running out of magic, the portal closes with Evie trapped inside. While Cam runs off with the trident, Zac, Lyla, and Sirena arrive on the island, having discovered what Nixie and Cam are up to. Sirena reopens the portal with her Moon Ring, allowing Zac to rescue Evie. Afterwards, Zac and the girls admit the truth about their identities to Evie.

With the full moon fast approaching, Zac prepares to give up his powers while the mermaids prepare to return to their pod. Evie is upset with Zac for keeping his secret from her for so long but agrees to keep his secret until after the full moon. However, Cam manipulates Evie to keep Zac from going to Mako Island that night and possibly interfering with his true plan. The girls eventually realize that Cam is planning to become a merman himself so he can rule Mako Island with the trident. In the process, Nixie finally realizes her mistake in trusting Cam. The girls take Rita's Moon Rings and head to Mako to stop Cam. Meanwhile, Zac also realizes what Cam is up to and heads to Mako as well. The four come together with their powers and destroy the trident, preventing Cam from executing his plan. In the aftermath, Rita grants the mermaids their own Moon Rings for saving the Moon Pool. Zac remains a merman, which means the pod can't return to Mako yet. After Evie reconciles with the girls, Zac, Sirena, Lyla, and Nixie swim into the ocean together.