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An unusual and rare planetary alignment is set to cause the full moon to remove a mermaid's powers if they enter the moon pool! Charlotte shows immunity and tries to reveal the girls' secret before Lewis takes her to Mako Island. The girls follow and a battle erupts. But who will win?moreless
Angry over the short friendship with the girls, Charlotte forces Lewis to choose between her and his friends. This results in Cleo to feel isolated and she runs away and gets lost. When he is informed, Lewis must make up his mind: Cleo or Charlotte?
More friction arises, this time over Lewis' birthday party. Charlotte takes control and drives Rikki away from the party. However, things go out of hand and it is up to her to save the day.
Charlotte is determined to prove her love for Lewis and show she is better than the other three, and refuses their advice and takes matters into her own hands when Nate causes trouble for Lewis.
The girls decide that they should accept Charlotte, and the four work together when they need to join the volleyball team to avoid failing Physical Education.
Charlotte's stubborn nature and thirst for knowledge leads her to Max, who confirms her suspicions and leads her to the Moon Pool. Lewis meanwhile is having trouble trying to keep their relationship together.
Charlotte demands answers to why Lewis is hanging out with the girls so much. She starts to believe an excuse from Cleo, but then a discovery from inside Max's research brings her to the secret! Meanwhile, Ash decides to help Emma with her "fear of water"
Lewis is trying to find more information on the moon pool and stumbles across research on it by Max Hamilton from fifty years ago. Will Lewis reveal the girls secret to him in order to complete the puzzle?
For the first anniversary of the girls being mermaids, Cleo decides to throw a party. However, Emma and Rikki fall out following a fight between Ash and Zane and Cleo may have to celebrate alone.
It's a full moon and the girls insist that they don't need Lewis to assist his help, as all three girls are staying at Emma's and Ash is coming over. When Cleo and Rikki fall under the moon spell, can Lewis stop them from revealing their secret to Ash?
Zane learns of the myth of Ambergris, a fragrance that can make mermaids fall for any man that wears it. When he buys it, Nate ends up wearing it and Emma, Cleo and Rikki all fall for him!
Cleo is failing at school and is assigned a tutor, Charlotte. Cleo wants Lewis but her attitude to Charlotte only drives him further away.
Emma has to take Eliot for horse riding lessons and the competitive perfectionist tries to be better than the instructor. Meanwhile, Lewis double dates with Charlotte and Cleo.
Zane is curious by Rikki's reluctancy to reveal where she lives. So one day, he eventually convinces her to reveal her home: a trailer park with her grouchy father. Meanwhile, Cleo has to deal with some personal issues with Lewis and Charlotte regarding a jacket.
Everyone is shocked when Cleo is fired at the Ice Cream Stand, and even more so when Lewis takes her place! Rikki and Emma strike back at him but end up going too far.
Cleo is worried when she sees her dad around with another woman. When she arrives at their house, she turns out to be Charlotte's mother! Meanwhile, Rikki and Emma help Cleo ruin the dinner because they too think it is a date.
Trouble is in the air as the Sertori's start to suffer and the JuiceNet is endangered by a new bar. But when Lewis finds a book of mermaid spells, the girls attempt to use a potion to fix everything. However, things aren't so easy when you have special powers.
When Emma's parents are away for the weekend, she is left in charge of the house, so she invites Cleo to stay, but instead gets stuck with Rikki. After Rikki accuses Emma for being a control-freak, Emma decides to have a party to prove that she too can be a rebel. Meanwhile Nate gives Lewis advice how to be more manly and Cleo gets a secret admirer.moreless
Zane returns to the Gold Coast and Rikki has mixed feelings about it. Charlotte and Lewis are becoming close friends which causes jealousy in Cleo. In a mad rage, Cleo steals Charlotte's diary and discovers that Charlotte already has a boyfriend- RJ.
The girls have problems with their new powers and Cleo finds that Lewis isn't helping. A new girl called Charlotte arrives and develops a crush on a certain character.
The full moon comes around again and this time all three girls are affected and they travel to Mako Island and attack Lewis. And Cleo causes trouble for her parents.