H2O

Under the influence of a Full Moon the girls' powers are hugely enhanced and they wreak havoc on Lewis in his boat. The next day the girls realize they still need Lewis.

Lewis decides to test the girls' increased powers. Cleo has had enough of Lewis' smothering and dumps him.

Zane's back in town and still in love with Rikki. Cleo becomes suspicious of Lewis spending time with Charlotte.

Rikki comes to stay at Emma's house and stirs up the family unit. In trying to compete with Rikki, Emma tries to rebel and throws a party. Nate uses Lewis to make a play for Cleo.

Lewis finds an old book on mermaids and tests out a potion recipe on the girls.

Don appears to have a girlfriend - Cleo is shocked to find it is Charlotte's mother.

A mermaid prank gone wrong leads to a dolphin going missing at the Marine Park and Lewis has to take the fall to protect the girls.

Zane has an argument with a man in a trailer park but little does he know it's Rikki's dad.

Emma meets Ash - a handsome horse riding instructor. A horse falls ill and Emma must use her powers to fix it.

Cleo is failing at school and is assigned a tutor - Charlotte. Cleo wants Lewis back but her attitude to Charlotte only drives him further away.

Zane hears of a treasure under the ocean and enlists the girls to find it. Rikki is injured in the search.

Emma starts acting weird after pricking her finger on a barb of coral. Emma becomes more and more like a fish and Lewis has to find a way to cure her.

Don takes the family camping on Mako Island during a Full Moon. The girls are affected and need the moon pool for sanctuary.

Emma thinks she’s going to get a promotion at the juice bar but Ash is given the job. Emma and Ash clash over the job, but we discover it’s over a lot more. Meanwhile, Lewis stands up to Charlotte over spending time with Cleo.

Lewis and Zane find an old myth about mermaids is true – the scent of ambergris sends them wild. But it backfires when sleazy Nate gets hold of the scent and has all three mermaid girls on his arm!

Lewis has a bad dream about mermaids being discovered. It threatens to come true when Elliot asks Kim out on a date to the marine park and Cleo finds herself in trouble underwater in front of a crowd of people.

Cleo and Rikki push Ash into asking Emma out again – little did they know he’d turn up at Emma’s place in time for a full moon! Rikki and Cleo are both moonstruck and Ash looks set to discover Emma’s secret.

When Zane and Ash clash at the juice bar, Rikki and Emma take their boyfriend's sides. Cleo is left alone celebrating their one year anniversary of becoming a mermaid - until Lewis arrives just in time to help.

Lewis discovers someone called Max Hamilton did research fifty years ago on the strange properties of Mako Island. Lewis tracks the old man down and finds that he knows a lot more about mermaids than Lewis first thought.

Ash comes close to finding out about Emma. Meanwhile, the girls discover that Charlotte’s grandmother was Gracie. Old wounds open up for Charlotte and she finds part of Max’s research: an old movie of Gracie – as a mermaid!

Charlotte follows Lewis to Max Hamilton. Max tells all to Charlotte when he discovers she’s the granddaughter of his one true love. Charlotte and Lewis almost break up until she goes to the moonpool, becoming a mermaid herself!

The girls have to deal with a fourth mermaid who turns out to be a loose cannon; Charlotte almost turns into a mermaid at a volleyball competition. Charlotte discovers she has all three mermaid superpowers. Ominous signs.

As the girls continue to have problems accommodating Charlotte as a mermaid, Nate bullies Lewis. Despite the girls’ attempts to keep Charlotte under control, she uses her powers on Nate and almost exposes them all.

Charlotte takes over and organizes a surprise party for Lewis, annoying Rikki. At the party, Charlotte is jealous of Cleo and traps her and Emma in a pool room. Rikki comes back just in time.