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

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

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 mis...

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 lo...

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

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

While listening to Sirena sing, Lyla has an idea. If Sirena sings The Enchantment Song to Zac, he wi...

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

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

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

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

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 t...

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.

When the pod decides Zac is a threat and must give up his merman powers, two new mermaids, Mimmi and...

With Evie now a mermaid, Mimmi and Ondina try a dangerous spell to change her back to a human form,...

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

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

When Evie's dad decides to take tourists on dive charters to Mako Island, the gang must find a way t...

Sirena gives Evie mermaid lessons, which rubs Ondina the wrong way, while Erik tries to get to the b...

With the full moon approaching, Zac's plan to avoid Mako Island is dealt a blow when his father insi...

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

When a young mermaid follows Ondina back to Mako Island after a mermaid council meeting, it could sp...

When David sees Evie in the water as a mermaid, it puts Zac and the girls' secret at risk unless the...

Ondina adds too much jellyfish extract to Mimmi's body lotion, and the results put Principal Santos...

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

On the night of the full moon, Zac and Erik swim to Mako Island and unlock the merman chamber, revea...

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

After Cam absorbs moon pool water, he discovers he has power over water, which gets him a place in t...

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

When Erik dives down and touches one of the rock outcrops on Mako reef, he's transported into a sphe...

When Sirena sees a video that shows a kayaker being lured by a mermaid's song, she starts to follow...

A surprise birthday party is in the works for Evie, who accidentally shrinks herself and falls into...

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

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

Ondina doesn't want to choose between Erik and the pod when the pod returns. To cheer her up, Erik d...

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

When Evie comes down with a fever that causes the temperature in the room to soar, Carly suspects th...

When Erik learns that the trident stone is the missing element needed to activate the merman chamber...

The chamber's true purpose is revealed: to drain the magic from all mermaids. Zac risks his life to...

Ondina is tasked with teaching the younger mermaids. A mermaid from China joins the pod. During a fu...

When marine park workers are sent to investigate the reported sea monster, the mermaids must create...

Weilan casts a knowledge transference spell on Zac to help him pass a biology test. But more than ju...

When Evie tries using her new moon ring to magically finish her chores, things quickly get out of co...

Weilan comes up with the idea of using a Chinese puzzle box to trap the sea dragon. Cam panics when...

Evie's moon ring lesson with Ondina takes an unexpected turn. At the marine park, Mimmi discovers th...

Zac begs Weilan to teach him an Eastern spell few have mastered, which he hopes to use against the d...

On the eve of the full moon, Ondina and Mimmi defy Veridia's orders. Evie becomes suspicious when sh...

After overhearing Ondina blaming her for Evie's loss, Weilan runs off. Meanwhile, Mimmi and Ondina c...

Zac realizes a shell he found has magical powers, and he accidentally sends the mermaids back in tim...

While Ondina teaches the little mermaids to walk on land, her fastest-learning student wanders off a...

When Mimmi and Chris go on a date at the beach, Ondina goes to great lengths to protect her. Cam tri...

Mimmi and Zac are startled by a mysterious yet strangely familiar vision. Cam's dual role as Carly's...

Weilan mistakenly makes tea for Rita using a magic growth accelerator. Can the mermaids cure Rita be...

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

The vision reappears to Mimi and Zac, this time speaking to them. Weilan learns a new detail about t...