| 1: The Seventh Cycle |
| Feb 15, 2015 |
| 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. |
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| 1: The Seventh Cycle |
| Feb 15, 2015 |
| 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. |
| 2: Sticky Situation |
| Feb 22, 2015 |
| 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. |
| 3: Discovery |
| Mar 1, 2015 |
| When Zac has a powerful vision about his connection to Mako Island, he and the mermaids visit the island to investigate. |
| 4: A New Tail |
| Mar 8, 2015 |
| Erik's curiosity about the girls and Mako Island becomes a problem when he decides to investigate further. |
| 5: Bad For Business |
| Mar 15, 2015 |
| When Evie's dad decides to take tourists on dive charters to Mako Island, the gang must find a way to change his mind. |
| 6: Stormy Seas |
| Mar 22, 2015 |
| 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. |
| 7: Awakening |
| Mar 29, 2015 |
| 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. |
| 8: Land School |
| Apr 5, 2015 |
| 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. |
| 9: Stowaway |
| Apr 12, 2015 |
| When a young mermaid follows Ondina back to Mako Island after a mermaid council meeting, it could spell trouble with the pod. |
| 10: Keeping The Secret |
| Apr 19, 2015 |
| 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. |
| 11: Only As Young As You Feel |
| Apr 26, 2015 |
| Ondina adds too much jellyfish extract to Mimmi's body lotion, and the results put Principal Santos in dangerous waters at the marine park. |
| 12: Supersized |
| May 3, 2015 |
| When Mimmi loses her moon ring in the Ocean Café's cooler room, it creates havoc for David and his brother's business. |
| 13: Reunion |
| May 10, 2015 |
| On the night of the full moon, Zac and Erik swim to Mako Island and unlock the merman chamber, revealing a startling secret. |
| 14: A New Man |
| May 17, 2015 |
| Zac struggles to come to terms with the news that he's a real merman, he's adopted and Mimmi is his sister. |
| 15: Careful What You Wish For |
| May 24, 2015 |
| 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. |
| 16: First Date |
| May 31, 2015 |
| Ondina sneaks Erik into the grotto to duplicate a pearl he gave her, but she accidentally turns him into a copy of Poseidon. |
| 17: The Merman Code |
| Jun 7, 2015 |
| 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. |
| 18: The Siren |
| Jun 14, 2015 |
| 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. |
| 19: Surprise! |
| Jun 21, 2015 |
| 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. |
| 20: The Job |
| Jun 28, 2015 |
| 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. |
| 21: New Orders |
| Jul 5, 2015 |
| On the night of the full moon, Zac and Ondina sneak away to Mako, and Ondina reveals her plan to destroy the chamber. |
| 22: The Last Dance |
| Jul 12, 2015 |
| 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. |
| 23: Stay or Go |
| Jul 19, 2015 |
| At the marine park, Ondina and Mimmi get into trouble when a dolphin splashes them and a little girl sees them transform into mermaids. |
| 24: The Truth About Evie |
| Jul 26, 2015 |
| 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. |
| 25: The Trident Stone |
| Aug 2, 2015 |
| 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. |
| 26: The Chosen One |
| Aug 9, 2015 |
| 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. |