It's a full moon and the three mermaids Nixie, Lyla and Sirena are tasked to guard Mako and the moon pool. While Zac and Cam go camping on Mako island. When Zac falls int ...

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. ...

Attempting to capture Zac in his natural environment, Sirena, Lyla, and Nixie follow him to school. When their plan fails, the school principal, Rita Santos confronts the ...

Nixie and Sirena won't help Lyla try to zap Zac's powers, so Lyla decides to do it alone. This misfires when a waitress spills a drink on Lyla and Lyla rushes to hide in ...

Rita tells the girls to go to the Moon Pool while it is raining, where they will be safe. Nixie obeys, but Lyla and Sirena do not. They attempt to use the Moon Ring to st ...

Joe, David's brother has bought a new boat and decides to take it out for a spin. His fish finder locates a dolphin, but that dolphin is actually Nixie. ...

Believing that Zac's unusual behavior is a result of feeling lonely, Evie decides to throw Zac a surprise pool party, against both Cam and Zac's wishes. Because of his be ...

The first full moon since Zac was transformed into a merman has arrived and the girls believe that complete isolation from the moon will rob Zac of his powers. Despite th ...

Lyla convinces Sirena to use her beautiful singing voice to enchant Zac to follow their orders and remove his powers. This backfires, however, when her voice enchants Dav ...

Zac wants to know exactly how he became a merman, so he decides to return to Mako to find out the truth. However, the girls know that Zac doesn't know about the underwate ...

Sirena paints a shell for her sister Aquata and shows it to Lyla and Nixie. Nixie tells her she'll never see her again so she shouldn't bother. A despondent Nixie meets a ...

Evie learns Zac is researching tridents while doing algebra homework together. Lyla tries to get Nixie and Sirena focused on keeping Zac from finding the trident. Rita wo ...

Rita and the girls worry about the upcoming full moon's effect on Zac. Nixie thinks they should let Zac find the trident so they can take it from him and hide it. Lyla th ...

Lyla is upset that they've lost Zac's trust. Rita confronts Zac on his dropping grades. Rita convinces the girls to restart their training since they never finished merma ...

Rita continues to train the girls (this time, how to squeeze lemons from a distance using their fingers). David is holding auditions for a singer to join him in performin ...

Showing off his new smart phone, Cam takes pictures and video of Zac swimming in merman form which makes Zac uneasy. Cam annoys Nixie at the Ocean Café, causing her to ...

Rita continues to train the girls (to control water, whatever form it takes). Zac finds a moon ring stuck in a rock on the ocean floor. He breaks it out and gives it to E ...

The Halloween costume party at the Ocean Café falls on a full moon. Zac and Cam make preparations to go for the trident. Zac tells the girls that he isn't going to Mak ...

The girls must get the trident out of Zac's possession. Meanwhile, Zac and Cam attempt to use it but can't seem to get it to do anything. Lyla keeps trying to warn Zac of ...

Zac tries to keep the trident hidden from the mermaids. Evie's article on Rita and the girls doesn't go over well, especially with David. Rita warns Zac about the dangers ...

While swimming in the ocean, Zac sees Aquata. She immediately flees to the Moon Pool and is reunited with her sister Sirena. The girls get her up to speed with Zac, the t ...

Rita catches the girls looking through her mermaid phials and informs them that they are not ready to learn about them yet. When David goes to deliver Rita's fish order, ...

Zac enlists Cam's help in his search for the trident. Rita gives the girls a lesson in camouflage. A worried Lyla goes to check that the trident is still hidden and watch ...

Cam is angry with Zac for locking the trident back up. Rita invites Zac to come over for training with the girls. Nixie isn't happy when he arrives. She doesn't trust him ...

Zac has a nightmare involving the trident and the Moon Pool. Cam apologizes to him and expresses his disappointment in Zac's locking it back up. Zac almost tells Evie his ...

Cam shows Nixie that he is hiding the trident in his school locker. Evie agrees to keep everyone's secret until after Zac is turned back into a normal human. Cam apologiz ...