Series / Mako Mermaids: An H2O Adventure
Just add water. Again!

A Spinoff of the popular Australian fantasy series H2O: Just Add Water, Mako Mermaids follows the life of three mermaids and teenage boy turned merman. Sirena, Lyla, and Nixie were three young mermaids charged with protecting the small magical island of Mako during the full moon in order for the rest of their mermaid pod to perform their moon rituals. Unfortunately young Zac falls into a mystical pool on Mako during a full moon and interrupts the sacred ritual, thus granting him merman powers, but causing the three young mermaids to be cast out of their pod. Equal parts comedy and drama, the series starts off with Sirena, Lyla, and Nixie attempting to remove Zac's powers so as they can rejoin their mermaid family.

As of the second season, a few changes have been made to the cast line-up. Lyla and Nixie have left the show, and are replaced by two new mermaids named Mimmi and Ondina. A new merman, named Erik, is introduced as well.

The second season follows the girls' continued efforts to remove Zac's powers, Evie's efforts to adjust to the changes in her life, and Zac and Erik's attempts to uncover the secret of the newfound Merman Cave on Mako Island.

The first, second and third seasons are available on Netflix and also premiered on Disney Channel US on January 18, 2016.

Tropes Found in Mako Mermaids.

  • Act of True Love: Rita, the school principal, turns out to be a mermaid herself. She eventually reveals how, as a teen, she fell in love with a human boy, leaving her pod and becoming human herself to be with him but he died before they could be married. Despite that, Rita is clear she never regretted her choice.
  • All Women Love Shoes: Nixie starts a fight with Evie over the "perfect shoes" in Lyla Alone.
  • Ambiguously Evil: Erik appears to be plotting something terrible, but he might just be interested in the Merman Cave because of its significance to merman history. He sets forth a series of actions in the chamber after stealing Zac's powers that put all of the mermaids at risk. Granted he was trying to do it for a good reason, to protect the mermaids with the power, but he completely ignored all evidence to the contrary and lied, schemed, and stole to get that far.
  • Artifact of Doom: It's claimed by the mermaids that the trident is a force of ultimate destruction and evil no matter who wields it. Naturally, it has to be destroyed.
  • Big Damn Heroes: Zac gets one in in the season 1 finale when he stops Cam from destroying the moon pool.
  • Bookcase Passage: In the third episode the girls find one in Principal Rita's home that leads to a secret passage to the sea.
  • Character Development: Cam's jealousy of the Mermaids and Zac, as well as some abuse he took for the latter turns him against everyone in the first season finale where he nearly destroys the Moon Pool. By the second season he eventually makes up with Zac but gets tempted by Erik to again side against the protagonists. But this time, thanks to Zac and Carly, he keeps his moral center and remains an ally.
  • Continuity Nod: Scenes with Zac are similar to scenes from the original series.
    • Zac drinking floating bubbles of water from the air was originally done by Cleo.
    • Like Emma, Zac had a promising watersports career which was brought to an abrupt end by becoming a merperson.
    • When Zac tries to stop the surprise pool party, he starts to boil all the water in the pool away, which was done by Rikki to get revenge on Miriam for being, well, Miriam.
  • Dangerous Device Disposal Debacle: Twice. The trident was supposed to "never be unlocked again", and later, when Lyla hides it, it takes Zac all of an episode and a half to find it again.
  • Defrosting Ice Queen: Lyla is definitely the harshest of the three leads at first.
    • Ondina qualifies as well.
  • Elemental Powers: Much like in the original series, Mermaids have a whole host of sea and storm related powers that allow them to control water and wind.
  • First Law Of Thermodynamics: Blown to pieces between the nineteenth episode and the twenty-third. The trident charges up by partially draining one moonring, is used a few times, and yet it still has enough power to charge up three moonrings.
  • Freudian Trio: in the first few episodes it seems that Nixie is the Id, Lyla is the Superego, and Sirena mediates between the two, but the remainder of the series seems to have Lyla and Nixie reverse roles.
  • Great Offscreen War: Sometime before the start of the show, there was a great war between mermaids and mermen, which is why most of them today have considerable animosity for one another.
  • Humanity Ensues: When they first become human, the girls have a hard time figuring out walking and spend their first episodes getting used to human traits from what to eat to going to the bathroom.
  • Jerkass Has a Point: Cam can be a Manipulative Bastard, but when he says he feels thrown under the bus a lot for being a thankless Secret Keeper and his wishes to be let in on on the magic have merit.
  • I Am Who?: It turns out that the reason Zac is able to manipulate the Merman Cave is because he was always a merman, and the trip to the moon pool broke the spell keeping him human.
  • Island Base: The mermaids use Mako Island as their go-to hideout.
  • Island of Mystery: Mako Island is home to a number of weird things, including the Moon Pool, the Merman Cave, and the cave that leads to the trident's storage area.
  • Lady Land: Mermen exist, but are sent to live among humans, leaving only the females in the pod. After helping save the island from Erik's power trip, Zac is admitted into the pod.
  • Lethal Chef: In an attempt to calm Mimmi's hostile mood, Ondina makes crab pancakes for her as a peace offering. Not only are they charcoal burned, they're hard as a rock too.
  • Local Hangout: The Ocean café.
  • Long-Lost Relative: Late in Season 2, Zac and Mimmi learn that they are siblings.
  • Love Triangle: Type 4, at least early on. Carly likes David, but David and Sirena are clearly head over heels for each other.
  • Lunacy: Genuine mermaids (Evie is not one) get the energy for their magic from the Moon Pool, and one can become a mermaid (or in Zac's case, regain his merman powers) by being in the Moon Pool on a full moon. Furthermore, inexperienced merfolk can be overwhelmed by the full moon's power, lapsing into a trance or drugged-like state.
  • Magical Girl: Four of them, and two magical boys.
  • Magic Pants: During the shift from human to merfolk form not only do clothes disappear until they become human again but any hair decorations and hair spray also disappear, leaving the transformee's hair untied. Only moon rings are shown to carry over during the transformation, likely due to their magical nature.
  • Magnetic Plot Device: For some reason, the mermaids just can't seem to keep people off Mako Island.
  • Manipulative Bastard: Cam becomes this in the final three episodes of the first season.
  • Meaningful Name: By the boatload. Nixie is a Germanic water creature much like a mermaid. Sirena is related to the Greek Sirens, which are sometimes mistaken for mermaids. One origin of the name Lyla is a term to refer to someone who is from an island. "Ondina" is a genus of sea snails.
  • Mermaids Out of Water: The girls' first voyage on land is a literal interpretation of this trope.
  • Mr. Fanservice: Zac and Erik, by virtue of being mermen.
  • One-Gender Race: Averted in Season 2, when it's revealed that mermen are alive and well - they just live separately from mermaids.
  • Only the Worthy May Pass: Only a "true" merman can get into the merman cave.
  • O.O.C. Is Serious Business: It is an indication of how bad your personal relationship with Mimmi is when she stops being nice. opting for direct animosity or confrontation.
  • Organic Bra: In mermaid form, the girls have scales in exactly the same pattern as a bra, complete with straps. The merman on the other hand only have scales on their tail.
  • Our Mermaids Are Different: Like in the original series and films like Splash, a dry mermaid has human legs and a wet mermaid has fins. Mermaids also hold Elemental Powers and magic, and there are different varieties of regional mermaid.
  • Required Spinoff Crossover: Cariba Heine will return as Rikki in the third series
  • Secret Keeper: Cam is this for Zac. It's particularly hard for him to be so, because Zac initially wants to reveal his powers and be a superhero. Lyla manipulates events so the mermaids also become this for Zac, but they already knew he was a merman
  • Shout-Out: Aquata is the name of another mermaid who was also a sister of a main character (Ariel) in The Little Mermaid.
    • Erik also shares a name with a Little Mermaid character.
  • Spoiler Opening: The fact that Erik is a merman might have been a pretty major plot twist if they hadn't shown him with a tail in the opening credits.
  • Suspiciously Similar Substitute: Down-to-earth and cautious Nixie, for Emma; naive Sirena, for Cleo (with better non-magic singing skills, actually); and stubborn and impulsive Lyla, for Rikki.
  • The Chosen One: Zac. He is openly called it towards the end of the second season and the last episode of season two is even called The Chosen One.
  • Wham Line: "Do you realise what would happen if the son of Nerrisa controls the power of this place?"