Mako Mermaids: An H2O Adventure - Season 1

The Mako Island mermaid pod has left leaving Lyla, Nixie and Sirena as outcasts. To rejoin their pod, the three mermaids must turn Zac from part-time merman to full-time land boy. It's simple, they can catch him, then use their magic to remove his powers. Only problem is... Zac has legs. The mermaids do not. With the power of Sirena's Moon Ring, the mermaids give themselves legs and stumble around the foreign Gold Coast, intent on capturing Zac. They find him at the beach on Surf Life Saving duty with Cam, where Zac has to find ways of not getting wet! In this public setting, Lyla tries to subtly use her powers on Zac. But when Zac spectacularly uses his newfound powers to save a little girl in the water, the mermaids realise their plan may be simple, but not easy. For Zac, the experience is eye opening. Initially his tail was confronting, and an inconvenience he was burdened with. But he now sees it as a gift and is beginning to enjoy the powers that come with it.

The mermaids are worried about Zac - he may find them and the Moon Pool. Then no mermaid is safe! Attempting to capture Zac in his natural environment, Lyla, Nixie and Sirena follow him to a foreign place... his school. But he is always with his friends, Evie and Cam. To get Zac alone the mermaids use their magic to make him feel ill, but they accidentally manipulate a water fountain, forcing a wet Zac to run off to hide while he transforms into a merman. Luckily, he manages to dry himself off before Evie discovers him with a tail. The mermaids' plan to catch Zac is interrupted when the school principal, Rita Santos, confronts them and confiscates Sirena's Moon Ring. An upset Sirena is determined to get her sister's ring back, so the mermaids tail Rita home to retrieve it. There's no sign of Rita as they wander around the house, but the mermaids are confronted by Poseidon, Rita's 'fisheating' cat... and they discover a secret pool under the house. As the mermaids determine the pool is saltwater, Rita suddenly surfaces, in full mermaid form. Principal Santos is a mermaid! Rita explains that she was banished from her pod for falling in love with a land dweller. Not only does Sirena get her Moon Ring back, but the girls convince a begrudging Rita to help them in their quest to fix Zac.

Lyla, Nixie and Sirena use Rita's secret sea entrance to return to land. While leaving they discover another secret cavern, the Grotto, full of sea objects and treasure. Angry that the mermaids are back, a fearful Rita warns them about the ways of land dwellers. But to Nixie and Sirena the land is a world full of new and exciting experiences, like shopping. To Lyla, their legs are a temporary necessity until they can remove Zac's merman powers. Lyla searches for Zac at the Ocean Café, but when a waitress accidentally spills a drink on her, she has only seconds before her tail is on display for all to see. She rushes to the cool room - just before secretly transforming into a mermaid. The cool condensation prevents Lyla from transforming out of fish-form, and when she tries to manipulate the thermostat she only manages to turn the sprinkler system on! Meanwhile, Nixie and Sirena secretly follow Zac's girlfriend, EVIE who is going shopping. Nixie and Evie battle over a prized pair of shoes, and ultimately get banned from the store. Returning to the café, Nixie and Sirena wonder where Lyla is and find her in the cool room. While Sirena distracts the café owner David and his customers with a song, Nixie helps Lyla transform... and walk out of the café on two feet. Feeling sorry for themselves, the mermaids return to Rita's to say goodbye: being on land is too dangerous. But Rita decides to help them find their way on land, and as young mermaids.

The threat of rain keeps Lyla, Nixie and Sirena indoors and unable to look for Zac. Nixie decides it's too risky to try to get to Zac and heads out to Mako Island alone. Refusing to simply wait for the rain to clear, Lyla suggests that Sirena uses her Moon Ring to stop the rain. Inexperienced with the Moon Ring's magic, Lyla and Sirena create a blizzard in Rita's secret Grotto and ice over the sea entrance. While trapped in Rita's house, the two young mermaids fall ill with Snow Rash. Meanwhile, Zac is meant to go on a camping trip with his dad. But the rain makes it dangerous for him to go outdoors too. Zac has to find a way to get out of the trip without hurting his Dad's (Dr. Blakely) feelings. Cam is called for help, and he talks Zac into feigning illness. The café owner David arrives at Rita's to deliver some seafood. Worried about the mermaids he calls Dr. Blakely, forcing Lyla and Sirena to try to explain their curious mermaid symptoms... or be taken to hospital. Luckily for Zac his father is busy with the mermaids, and believes his son may have the same disease. With Dr. Blakely ready to take Lyla and Sirena to hospital for tests, Nixie seeks Rita's help and magically uses dried seahorse powder to cure the mermaids' Snow Rash and keep their secret safe.

Zac is still enjoying being a merman and the mermaids are no closer to removing his powers. Lyla believes they need a new strategy - maybe they should become his friend so they can convince him to lose his powers. But Nixie doesn't think Lyla is capable of making friends - she can't even make friends with a dolphin! Unfortunately for Lyla she never learnt to speak dolphin, one of the perks of being a mermaid, and Sirena and Nixie love to make fun of it. But the young mermaids decide to give 'friendship' a try and head to the Ocean Café to find Zac. While Lyla and Sirena follow Zac home to try to get his trust, Nixie decides they are not going to succeed and goes for a swim. David's brother Joe, who delivers seafood to the Ocean Café, has a new boat and takes David out for a spin to show it off. While speeding around on the Broadwater, the boat's fish-finder locates a dolphin... but it's not like any dolphin Joe has seen before and he decides to chase it, while refusing to listen to David's protests. And it's not a dolphin, but Nixie out having fun with dolphins. With Joe closing in, Nixie panics and gets trapped in some netting under the jetty outside Zac's house. Under the impression that Joe is terrorising a dolphin, Zac subtly uses his powers to interfere with Joe's boat, and Lyla secretly uses her powers to help. With everyone distracted, Sirena frees Nixie from the netting and they escape to safety. Back at the café, there's celebrations for teaching Joe a lesson... and the mermaids are on their way to becoming Zac's friends.