
When Mimmi loses her moon ring in the Ocean Café’s cooler room, it creates havoc for David and his brother’s business.
Ondina adds too much jellyfish extract to Mimmi’s body lotion, and the results put Principal Santos in dangerous waters at the marine park.
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.
When a young mermaid follows Ondina back to Mako Island after a mermaid council meeting, it could spell trouble with the pod.
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.
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.
Sirena gives Evie mermaid lessons, which rubs Ondina the wrong way, while Erik tries to get to the bottom of Zac and Cam’s falling out.
When Evie’s dad decides to take tourists on dive charters to Mako Island, the gang must find a way to change his mind.
Erik’s curiosity about the girls and Mako Island becomes a problem when he decides to investigate further.
When Zac has a powerful vision about his connection to Mako Island, he and the mermaids visit the island to investigate.
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.
When the pod decides Zac is a threat and must give up his merman powers, two new mermaids, Mimmi and Ondina, are sent to make sure he obeys.
Cam betrays Nixie after planning to become a merman and rule Mako.
Nixie agrees to help Cam unlock the Trident, but Evie wants to come along.
Lyla teaches Zac about mer history and the ocean but Nixie doesn’t trust him.
Zac leads Lyla to the Trident; they fight for control of it and Lyla is knocked unconscious.
Rita’s cat is turned into a human after walking through a bunch of mermaid powders.
Aquata returns saying Sirena can come back to the pod, but Lyla and Nixie can’t.
Zac must find a place to hide the Trident from the Mermaids.
After acquiring the Trident, Zac doesn’t know how to turn it on.
Zac is being watched by the mermaids, but with Cam’s help he evades them.
After finding a Moon Ring on the sea floor, Zac gives it to Evie. Now, the mermaids must get it back.
Cam gets a new phone and films Zac swimming.
David and Sirena’s relationship continues to grow, while Nixie and Lyla are worried she won’t want to return to the sea.