It's a full moon and the three mermaids Nixie, Lyla and Sirena are tasked to guard Mako and the moon pool. While Zac ...

Sirena, Lyla and Nixie must turn Zac back into a land boy. Using Sirena's Moon Ring, they give themselves legs and wa...

In trying to get the Moon Ring back, the mermaids uncover Rita's secret.

Nixie and Sirena won't help Lyla try to "zap" Zac's powers, so Lyla decides to do it alone. This misfires when a wait...

Lyla and Sirena attempt to use the Moon Ring to stop the rain, but instead make it snow indoors.

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

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

It's a full moon and the mermaids think that if they keep Zac out of the moonlight, he will lose his powers and retur...

While listening to Sirena sing, Lyla has an idea. If Sirena sings The Enchantment Song to Zac, he will fall under her...

Against Nixie and Sirena's advice, Lyla goes with Zac to Mako Island. She steals Rita's Moon Ring to open the land en...

The girls fear their pod will never return. A despondent Nixie gives "advice" to a young boy named Ben. Zac researche...

Zac continues to try to find the trident. Lyla focuses on keeping him from it. Rita won't keep giving the girls money...

Rita and the girls worry about the upcoming full moon's effect on Zac. Nixie thinks they should let Zac find the tri...

Zac starts to wonder why their principle, Rita, is helping Lyla, Nixie, and Sirena.

David and Sirena's relationship continues to grow, while Nixie and Lyla are worried she won't want to return to the sea.

Cam gets a new phone and films Zac swimming.

After finding a Moon Ring on the sea floor, Zac gives it to Evie. Now, the mermaids must get it back.

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

After acquiring the Trident, Zac doesn't know how to turn it on.

Zac must find a place to hide the Trident from the Mermaids.

Aquata returns saying Sirena can come back to the pod, but Lyla and Nixie can't.

Rita's cat is turned into a human after walking through a bunch of mermaid powders.

Zac leads Lyla to the Trident; they fight for control of it and Lyla is knocked unconscious.

Lyla teaches Zac about mer history and the ocean but Nixie doesn't trust him.

Nixie agrees to help Cam unlock the Trident, but Evie wants to come along.

Cam betrays Nixie after planning to become a merman and rule Mako.