The Seventh Cycle
E1
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.
Sticky Situation
E2
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.
Discovery
E3
When Zac has a powerful vision about his connection to Mako Island, he and the mermaids visit the island to investigate.
A New Tail
E4
Erik's curiosity about the girls and Mako Island becomes a problem when he decides to investigate further.
Bad For Business
E5
When Evie's dad decides to take tourists on dive charters to Mako Island, the gang must find a way to change his mind.
Stormy Seas
E6
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.
Awakening
E7
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.
Land School
E8
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.
Stowaway
E9
When a young mermaid follows Ondina back to Mako Island after a mermaid council meeting, it could spell trouble with the pod.
Keeping The Secret
E10
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.
Only As Young As You Feel
E11
Ondina adds too much jellyfish extract to Mimmi's body lotion, and the results put Principal Santos in dangerous waters at the marine park.
Supersized
E12
When Mimmi loses her moon ring in the Ocean Café's cooler room, it creates havoc for David and his brother's business.
Reunion
E13
On the night of the full moon, Zac and Erik swim to Mako Island and unlock the merman chamber, revealing a startling secret.
A New Man
E14
Zac struggles to come to terms with the news that he's a real merman, he's adopted and Mimmi is his sister.
Careful What You Wish For
E15
After Cam absorbs moon pool water, he discovers he has power over water, which gets him a place in the trials for the school swim team.
First Date
E16
Ondina sneaks Erik into the grotto to duplicate a pearl he gave her, but she accidentally turns him into a copy of Poseidon.
The Merman Code
E17
When Erik dives down and touches one of the rock outcrops on Mako reef, he's transported into a sphere of endless water with no way out.
The Siren
E18
When Sirena sees a video that shows a kayaker being lured by a mermaid's song, she starts to follow David obsessively, and he falls under her spell.
Surprise!
E19
A surprise birthday party is in the works for Evie, who accidentally shrinks herself and falls into an aquarium after trying on Mimmi's mood ring.
The Job
E20
Mimmi takes a job at the marine park, where she meets Chris, a young man who is desperate to get into a dolphin training program.
New Orders
E21
On the night of the full moon, Zac and Ondina sneak away to Mako, and Ondina reveals her plan to destroy the chamber.
The Last Dance
E22
Ondina doesn't want to choose between Erik and the pod when the pod returns. To cheer her up, Erik decides to throw a party in the café.
Stay or Go
E23
At the marine park, Ondina and Mimmi get into trouble when a dolphin splashes them and a little girl sees them transform into mermaids.
The Truth About Evie
E24
When Evie comes down with a fever that causes the temperature in the room to soar, Carly suspects that her friend is keeping a secret from her.
The Trident Stone
E25
When Erik learns that the trident stone is the missing element needed to activate the merman chamber, Zac gives it to the mermaids for safekeeping.
The Chosen One
E26
The chamber's true purpose is revealed: to drain the magic from all mermaids. Zac risks his life to shut it down and restore the mermaids' magic.