H2O

Three friends discover a secret pool where, by the magical powers of the full moon, they are turned into mermaids!

Annoying Miss Popularity, Miriam, is having a pool party that the girls don't want to miss. But it's a risky activity for three mermaids: their secret could be out.

Emma and Rikki love being mermaids and exploring the underwater realms but Cleo, with her fear of water, still won't go in.

Determined to live her life as normal, Cleo confronts her fears and lands a job at the Marine Park, helping out to feed the dolphins.

Lewis is busy testing the girls' powers, attempting to discover how they became mermaids.

Rikki, as a mermaid, saves Elliot from drowning at the beach. She succeeds without Elliot seeing her tail - but there's another problem; he falls in love with her!

It's the night of Emma's father's birthday party and also a full moon. Miss Chatham warns Cleo of impending trouble during full moons but the girls ignore her advice.

Lewis studies the girls and is on the verge of discovering how they transform into mermaids.

One of Cleo's favorite pet fish, Pluto, has died. When Rikki tries to buy a replacement, she makes the mistake of getting a fresh water fish when Cleo collects saltwater fish.

There's a short film competition at the juice bar. Zane, in an effort to impress his father, enters the competition attempting to film himself breaking his father's windsurfing record around Mako Island.

Against her better judgment, Emma is persuaded by Byron to train him for the swimming competition.

Another full moon strikes - but this time the girls are prepared; they are going to stay indoors and watch DVDs. Everything seems to be going well until Cleo is transfixed by the reflection of the moon in a pool of water in the bathroom sink.

When Miss Chatham's living situation comes under threat, Emma helps her out, arranging for her to stay at her place for a while. In talking to Miss Chatham, the girls soon discover she knows their secret.

Cleo's dad plans an embarrassing surprise party for her birthday so she escapes to Mako Island.

Emma is put in charge of managing the juice bar. Miriam decides to cause trouble and cuts the power to the cool room, then is unwittingly frozen by Emma who uses her powers to fix the freezer

A dolphin at Sea World will only eat from Cleo's hand and when she has to sneak out to feed him, everyone thinks she has a boyfriend.

A rainy day traps the girls inside. In an effort to "play sick" the girls create a situation where their families become part of a dire medical emergency.

Under the effects of the full moon Rikki goes crazy, boiling dry everything. She runs away to Mako where she meets Zane and kisses him.

Cleo and Kim are fighting like crazy and Cleo is pushed to breaking point. Then cousin Angela comes to stay and things just get worse. Cleo realizes there are more challenging things than an annoying sister.

Emma and Cleo help Lewis catch a huge fish in the fishing competition leading the judges to suspect he's a cheat. Meanwhile Zane and Rikki are stuck together on a balcony of a fancy hotel where after much argument, they kiss again.

Zane thinks Miss Chatham holds the key to the sea monster. While Zane gets closer to the secret, he also gets closer to Rikki. Zane dives to Miss Chatham's boat and sees a mermaid!

Emma and Cleo find out Zane and Rikki are an item and force her to choose - him or them. When Zane appears to side with Harrison over the Mako island development Rikki's decision is clear. Now it's Zane's turn to make a choice...

The girls discover a necklace for sale identical to Miss Chatham's. Miriam causes a stir by buying it - then throwing it in the water. Rikki faces a choice whether to take the necklace and reveal her mermaidness to Zane.

Lewis thinks he's found a way to control the girl's mermaidness. The school dance brings all our heroines' 'boy issues' to the surface.