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All Seasons

Season 1

  • S01E01 Outcasts

    • July 26, 2013
    • Eleven

    Young mermaids of the Mako Island pod, Sirena, Lyla, and Nixie, have the task of keeping trespassers off the magical island. On a full moon, they fail to stop a land boy, Zac, from falling into the sacred Moon Pool, and the power of the moon transforms him into a merman! As punishment the mermaids are banished from their pod as it flees Mako. To redeem themselves, the mermaids must find a way to turn Zac into normal boy once more.

  • S01E02 Getting Legs

    • August 2, 2013
    • Eleven

    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.

  • S01E03 Meeting Rita

    • August 9, 2013
    • Eleven

    Sirena, Lyla and Nixie follow Zac to school, but the school principal confronts them and takes Sirena's Moon Ring.

  • S01E04 Lyla Alone

    • August 16, 2013
    • Eleven

    When a waitress spills a drink on Lyla, she rushes to the cool room -- just before transforming into a mermaid!

  • S01E05 Blizzard

    • August 23, 2013
    • Eleven

    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.

  • S01E06 Dolphin Tale

    • August 30, 2013
    • Eleven

    Joe has a new boat and takes it out for a spin. His fish finder locates a dolphin, but it's not like any dolphin he's seen before.

  • S01E07 Zac's Pool Party

    • September 6, 2013
    • Eleven

    Zac's struggle with his merman secret intensifies when his girlfriend, Evie, throws him a pool party.

  • S01E08 Zac's Return to Mako

    • September 13, 2013
    • Eleven

    It's a full moon, and the mermaids think that if they keep Zac out of the moonlight, he'll lose his powers and return to his land-dwelling self.

  • S01E09 The Siren

    • September 20, 2013
    • Eleven

    While listening to Sirena sing, Lyla has an idea: If Sirena sings the "Enchantment Song" to Zac, he'll fall under her spell.

  • S01E10 Zac Returns to Mako

    • September 27, 2013
    • Eleven

    Against Nixie and Sirena's advice, Lyla helps Zac get to the Moon Pool. But when the entrance suddenly closes, they're trapped inside.

  • S01E11 I Don't Believe in Mermaids

    • October 4, 2013
    • Eleven

    Fearing they'll never get the pod to return to Mako, a despondent Nixie finds herself at odds with Lyla and Sirena.

  • S01E12 Close Call

    • October 11, 2013
    • Eleven

    Sirena is collecting shells on the reef when she sees merman Zac. Luckily, she torpedoes away before he recognizes her.

  • S01E13 Betrayal

    • October 18, 2013
    • Eleven

    The full moon is once again upon Mako, and the mermaids have to stop Zac from getting the all-powerful Trident.

  • S01E14 Battlelines

    • October 25, 2013
    • Eleven

    Now that he knows Sirena, Lyla and Nixie are mermaids, Zac begins to wonder about his school principal, Rita, and why she helps them.

  • S01E15 Sirena's Secret

    • November 1, 2013
    • Eleven

    When David invites Sirena to sing with him at the café, their connection grows. Lyla and Nixie fear that she might not want to return to the sea.

  • S01E16 Truce

    • November 8, 2013
    • Eleven

    While showing off his brand-new smartphone, Cam takes video footage of Zac swimming as a merman.

  • S01E17 Moon Ring 2

    • November 15, 2013
    • Eleven

    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.

  • S01E18 The Trident Job

    • November 22, 2013
    • Eleven

    Zac is being watched by the mermaids, but with Cam's help he evades them.

  • S01E19 Where's the On Button?

    • November 29, 2013
    • Eleven

    The Trident is every bit as powerful as Zac imagined -- but he can't get it to work. He wonders if the Trident needs to be activated by moonlight.

  • S01E20 Nowhere to Hide

    • December 7, 2013
    • Eleven

    The Trident is active and dangerous, and the mermaids must take it from Zac. Knowing this, Zac searches for the perfect hiding place.

  • S01E21 Aquata Returns

    • December 14, 2013
    • Eleven

    Sirena's sister, Aquata, returns to Mako with great news: Sirena can return to the pod. Unfortunately, the invitation isn't extended to Lyla and Nixie.

  • S01E22 Evie Times Two

    • December 21, 2013
    • Eleven

    When Rita's cat, Poseidon, steps through a puddle of mermaid powders, he is transformed into a person.

  • S01E23 Zac's Choice

    • December 28, 2013
    • Eleven

    Zac manages to find the Trident, but Lyla is right behind him. As the two battle for possession, a flash of energy knocks Lyla unconscious.

  • S01E24 Trust

    • January 4, 2014
    • Eleven

    While Lyla tries to teach Zac more about the ocean and mermaid history, Nixie refuses to trust him.

  • S01E25 Betrayed

    • January 11, 2014
    • Eleven

    Behind Sirena and Lyla's backs, Nixie helps Cam get into the Moon Pool to unlock the Trident. But Evie insists on coming along for the dive.

  • S01E26 Decision Time

    • January 18, 2014
    • Eleven

    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.

Season 2

  • S02E01 The Seventh Cycle

    • February 15, 2015
    • Eleven

    Two young mermaids, Ondina and Mimmi, run away from the Mako Island pod with Sirena to try to turn the merman Zac back into a land boy. But Zac’s connection to Mako is growing stronger. If they fail, they may never break his connection and save Mako for the pod. On the full moon, they attempt to remove his merman powers when his girlfriend Evie comes to the rescue – only to be turned into a mermaid!

  • S02E02 Sticky Situation

    • February 22, 2015
    • Eleven

    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.

  • S02E03 Discovery

    • March 1, 2015
    • Eleven

    When Zac has a powerful vision about his connection to Mako Island, he and the mermaids visit the island to investigate.

  • S02E04 A New Tail

    • March 8, 2015
    • Eleven

    Erik's curiosity about the girls and Mako Island becomes a problem when he decides to investigate further.

  • S02E05 Bad for Business

    • March 15, 2015
    • Eleven

    When Evie's dad decides to take tourists on dive charters to Mako Island, the gang must find a way to change his mind.

  • S02E06 Stormy Seas

    • March 22, 2015
    • Eleven

    Cam is on lifeguard duty when Erik quizzes him about Zac's connection to Mako. Erik is splashed and rushes into the ocean, disappearing. Cam paddles out in search of Erik, only to discover that Erik is a merman. Meanwhile, Sirena and Ondina engage in a contest of mermaid powers, whipping up a dangerous storm over the ocean. Cam gets in trouble for losing Erik, but Erik stages a fake rescue, making Cam a hero. Erik now has an ally in Cam – and Zac doesn’t like it.

  • S02E07 Awakening

    • March 29, 2015
    • Eleven

    With the full moon approaching, Zac's plan to avoid Mako Island is dealt a blow when his father insists they go on their annual camping trip.

  • S02E08 Land School

    • April 5, 2015
    • Eleven

    When Mimmi goes to the first day of the new school year, things get out of hand fast when she runs afoul of the science teacher.

  • S02E09 Stowaway

    • April 12, 2015
    • Eleven

    When a young mermaid follows Ondina back to Mako Island after a mermaid council meeting, it could spell trouble with the pod.

  • S02E10 Keeping the Secret

    • April 19, 2015
    • Eleven

    When David sees Evie in the water as a mermaid, it puts Zac and the girls' secret at risk unless they can convince David he's wrong.

  • S02E11 Only As Young As You Feel

    • April 26, 2015
    • Eleven

    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.

  • S02E12 Supersized

    • May 3, 2015
    • Eleven

    When Mimmi loses her moon ring in the Ocean Café's cooler room, it creates havoc for David and his brother's business.

  • S02E13 Reunion

    • May 10, 2015
    • Eleven

    On the night of the full moon, Zac and Erik swim to Mako Island and unlock the merman chamber, revealing a startling secret.

Season 3

  • S03E01 A New Man

    • May 17, 2015
    • Eleven

    Zac struggles to come to terms with the news that he's a real merman, he's adopted and Mimmi is his sister.

  • S03E02 Careful What You Wish For

    • May 24, 2015
    • Eleven

    After Cam absorbs moon pool water, he discovers he has power over water, which gets him a place in the trials for the school swim team.

  • S03E03 First Date

    • May 31, 2015
    • Eleven

    Ondina sneaks Erik into the grotto to duplicate a pearl he gave her, but she accidentally turns him into a copy of Poseidon.

  • S03E04 The Merman Code

    • June 7, 2015
    • Eleven

    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.

  • S03E05 The Siren

    • June 14, 2015
    • Eleven

    When Sirena sees a video that shows a kayaker being lured by a mermaid's song, she starts to follow David obsessively, and he falls under her spell.

  • S03E06 Surprise!

    • June 21, 2015
    • Eleven

    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.

  • S03E07 The Job

    • June 28, 2015
    • Eleven

    Mimmi takes a job at the marine park, where she meets Chris, a young man who is desperate to get into a dolphin training program.

  • S03E08 New Orders

    • July 5, 2015
    • Eleven

    On the night of the full moon, Zac and Ondina sneak away to Mako, and Ondina reveals her plan to destroy the chamber.

  • S03E09 The Last Dance

    • July 12, 2015
    • Eleven

    Ondina doesn't want to choose between Erik and the pod when the pod returns. To cheer her up, Erik decides to throw a party in the café.

  • S03E10 Stay or Go

    • July 19, 2015
    • Eleven

    At the marine park, Ondina and Mimmi get into trouble when a dolphin splashes them and a little girl sees them transform into mermaids.

  • S03E11 The Truth About Evie

    • July 26, 2015
    • Eleven

    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.

  • S03E12 The Trident Stone

    • August 2, 2015
    • Eleven

    When Erik learns that the trident stone is the missing element needed to activate the merman chamber, Zac gives it to the mermaids for safekeeping.

  • S03E13 The Chosen One

    • August 9, 2015
    • Eleven

    The 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.

Season 4

  • S04E01 A Visit from the East

    • May 15, 2016
    • Eleven

    Ondina is tasked with teaching the younger mermaids. A mermaid from China joins the pod. During a full moon ceremony, a terrifying beast emerges.

  • S04E02 Seeing Is Believing

    • May 22, 2016
    • Eleven

    When marine park workers are sent to investigate the reported sea monster, the mermaids must create a credible explanation to stop further inquiries.

  • S04E03 Recipe for Success

    • May 29, 2016
    • Eleven

    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!

  • S04E04 Mopping Up

    • June 5, 2016
    • Eleven

    When Evie tries using her new moon ring to magically finish her chores, things quickly get out of control. Joe makes an upsetting announcement.

  • S04E05 The Puzzle Box

    • June 12, 2016
    • Eleven

    Weilan comes up with the idea of using a Chinese puzzle box to trap the sea dragon. Cam panics when Carly suggests they take dance lessons.

  • S04E06 New Beginnings

    • June 19, 2016
    • Eleven

    Evie's moon ring lesson with Ondina takes an unexpected turn. At the marine park, Mimmi discovers the reason for a rescued dolphin's distress.

  • S04E07 Turning the Tide

    • June 26, 2016
    • Eleven

    Zac begs Weilan to teach him an Eastern spell few have mastered, which he hopes to use against the dragon. Joe encounters a water ball.

  • S04E08 The Way of the Dragon

    • July 3, 2016
    • Eleven

    On the eve of the full moon, Ondina and Mimmi defy Veridia's orders. Evie becomes suspicious when she spots Zac and Weilan meeting in secret again.

  • S04E09 Reversal of Fortune

    • July 10, 2016
    • Eleven

    After overhearing Ondina blaming her for Evie's loss, Weilan runs off. Meanwhile, Mimmi and Ondina combine their powers to try to restore Evie.

  • S04E10 Wishful Thinking

    • July 17, 2016
    • Eleven

    Zac realizes a shell he found has magical powers, and he accidentally sends the mermaids back in time five years, where they meet his younger self.

  • S04E11 Lost and Found

    • July 24, 2016
    • Eleven

    While Ondina teaches the little mermaids to walk on land, her fastest-learning student wanders off and soon runs into Chris and Karl on the beach.

  • S04E12 Trust Issues

    • July 31, 2016
    • Eleven

    When Mimmi and Chris go on a date at the beach, Ondina goes to great lengths to protect her. Cam tries to lure more upscale customers to the cafe.

  • S04E13 Letting Go

    • August 7, 2016
    • Eleven

    Mimmi and Zac are startled by a mysterious yet strangely familiar vision. Cam's dual role as Carly's boss and boyfriend becomes difficult to manage.

  • S04E14 Age Before Beauty

    • August 14, 2016
    • Eleven

    Weilan mistakenly makes tea for Rita using a magic growth accelerator. Can the mermaids cure Rita before Mrs. Trumble takes over her principal job?

  • S04E15 The Legend of Jiao Long

    • August 21, 2016
    • Eleven

    A priceless artifact recovered by a deep-sea treasure hunter provides a clue as to how the mermaids can defeat the water dragon.

  • S04E16 Homecoming

    • August 28, 2016
    • Eleven

    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.