Mako Mermaids centers on three mermaids, Sirena, Nixie, and Lyla, who are assigned with the task of protecting their magical Mako Island from trespassers, only to be thwarted by the arrival of a 16 year old land-dweller Zac – who forms a special connection with the island and is granted a blue fish-like tail and amazing marine powers. Threatened by his existence, the mermaid pod are forced to move away, abandoning Sirena, Nixie, and Lyla, who in a bid for survival must get legs, venture onto land, and take back Zac's powers or risk being outcasts forever.
When Evie comes down with a fever that causes the temperature in the room to soar, Carly suspects that her friend is keeping a secret from her.
When Evie's dad decides to take tourists on dive charters to Mako Island, the gang must find a way to change his mind.
A priceless artifact recovered by a deep-sea treasure hunter provides a clue as to how the mermaids can defeat the water dragon.
With Evie now a mermaid, Mimmi and Ondina try a dangerous spell to change her back to a human form, but the results are less than ideal.
The vision reappears to Mimi and Zac, this time speaking to them. Weilan learns a new detail about the dragon legend that suggests Nerissa is alive.
A surprise birthday party is in the works for Evie, who accidentally shrinks herself and falls into an aquarium after trying on Mimmi's mood ring.
Watch Now:AmazonErik's curiosity about the girls and Mako Island becomes a problem when he decides to investigate further.
Watch Now:AmazonZac manages to find the Trident, but Lyla is right behind him. As the two battle for possession, a flash of energy knocks Lyla unconscious.
Sirena, Lyla and Nixie follow Zac to school, but the school principal confronts them and takes Sirena's Moon Ring.
When Zac has a powerful vision about his connection to Mako Island, he and the mermaids visit the island to investigate.
Watch Now:AmazonWhen Mimmi loses her moon ring in the Ocean Café's cooler room, it creates havoc for David and his brother's business.
Rain keeps the mermaids indoors and unable to look for Zac. Lyla and Sirena try to use the Moon Ring to stop the rain, but they create a blizzard.
Sirena, Lyla and Nixie must turn Zac back into a land boy. Using Sirena's Moon Ring, they give themselves legs and walk on land to begin their task.
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.
On the night of the full moon, Zac and Erik swim to Mako Island and unlock the merman chamber, revealing a startling secret.
When Cam takes the Trident to Mako behind Nixie's back, the mermaids realize that he intends to turn himself into a merman so he can rule Mako Island.
While listening to Sirena sing, Lyla has an idea: If Sirena sings the "Enchantment Song" to Zac, he'll fall under her spell.
Watch Now:AmazonThe chamber's true purpose is revealed: to drain the magic from all mermaids. Zac risks his life to shut it down and restore the mermaids' magic.
While Lyla tries to teach Zac more about the ocean and mermaid history, Nixie refuses to trust him.
Weilan casts a knowledge transference spell on Zac to help him pass a biology test. But more than just science facts transfer from her body to his!
While showing off his brand-new smartphone, Cam takes video footage of Zac swimming as a merman.
When a waitress spills a drink on Lyla, she rushes to the cool room -- just before transforming into a mermaid!
Now that he knows Sirena, Lyla and Nixie are mermaids, Zac begins to wonder about his school principal, Rita, and why she helps them.
When Erik dives down and touches one of the rock outcrops on Mako reef, he's transported into a sphere of endless water with no way out.
Mimmi and Sirena prepare a potion that helps the user to look younger. Rita applies some before a school excursion to the Marine Park, accompanied by Dr. Ross, the park's handsome Director. Rita is unaware that Ondina accidentally altered the potion, which now makes her act younger as well. Evie and Zac have to move fast to stop the excursion turning into a disaster, while Rita behaves like a young child, threatening to reveal the truth about mermaids when she decides to go for a swim.
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