Season 4
Ep1- Complications
Cleo, Rikki and Bella have finished school ad fulfilled their destiny's as mermaids!
But, the problems aren't over yet…
The old owners of Emma's house had been selling it off, but when the sign is gone and Cleo sees a blond girl and a younger boy returning to it from soccer practice, Cleo finds out Emma is back! Rikki and Cleo introduce her to Bella but they don't exactly click.
Emma questions the girls new necklaces, she still wears the locket.
Bella is jealous and feels pushed out and Emma feels she was replaced.
It is the full moon and Emma is the one to be effected…but how?
Bella talks to Rikki and Cleo but they tell her Emma is their friend too.
Ep2- Changes
Emma looks for Ash but he has left town to study in Melbourne.
Emma needs Rikki and Cleo's comfort who have to dismiss Bella for a while but promise to come back later.
Bella confides in Will and Lewis and Cleo go on a boat trip.
Ep3- Hotting up
Kim gets a job alongside Cleo (as prompted by Sam ad Don to try new things) and Cleo finds it even more of a challenge to work at the marine park and stay dry.
Rikki, Bella and Emma go for a swim in an attempt to straighten things out but it makes no difference.
Rikki discovers a mysterious note.
Ep4- Bright lights
There is a big break for Bella's band when a record producer visit's the café.
Rikki and Emma can't make sense of the note and don't know who sent it.
Sophie becomes manager of the band.
Ep5- Tension
Will holds a small get together at his shack (Lewis, Zane, Cleo, Emma, Rikki, Bella and Sophie).
But the party isn't going to go to plan of course…
Bella and Emma are fighting for their friends attention and when Will seems to like Emma, Bella accuses her of flirting with him.
Ep6- Mermaid matters
Cleo's dad announces that Cleo and her friends should start applying for collage and everyone starts fretting.
Also, Don obtains some Ambercress which accidentally is spilt onto Kim's tutor, attracting all the girls to him.
Cleo has a hard time explaining it to her dad who researches it and links it to Cleo's fear of water.
Ep7- Luna Power
The girls crystals touch on the night of the full moon, exposing the girls to full moon's powers again.
Lewis can't help when he is surprisingly visited by Charlotte.
Bella realises there's more to Emma and the girls history than what she thought.
Ep8- Accusations and Realisations
Zane and Rikki have some trouble at the café when they realise they are in debt.
Meanwhile, Emma has some trouble with her powers and accidentally attacks Bella who retaliates and Cleo has to break up the fight.
Rikki and Cleo fear that they will never get them to get along.
Ep9- Crisis
Cleo and Lewis have a special dinner around Cleo's.
But, disaster strikes when water falls onto Cleo and Sam sees her.
Don and Sam have to put it down to too many late nights.
Bella decides to step down from the group.
Ep10- Don't mess with mermaids
It's the beginning of College and the girls all have new problems.
Bullies.
Cleo and Bella are picked on about their Hydrophobia and Rikki and Emma have to restrain from using their powers on boys that are teasing them.
Ep11- Tears and Tantrums
Emma meets up with a boy she met at college and explains how she really likes him.
But, does he like her back?
Meanwhile, Zane is in trouble when Nate threatens to quit the band and sue the café when he is given a duff drink.
Ep12- Caught in the act
Cleo and Kim are back at the Marine park and Kim is intent on overshadowing Cleo.
She pushes Cleo into the dolphin tank and Cleo has to hide to ensure Kim sees nothing.
At the Library, Emma and Rikki are working with Lewis to figure out the note which even Emma's mum doesn't get.
It leads them to Miss Chatam who explains that they have to work it out between Bella and Emma or one will be forced to leave the group and 'swim alone'.
Rikki and Emma decide to keep it a secret and try not to fear that they will have to face this decision soon.
Ep13- I'm so sorry
Bella drops by Cleo's house and is questioned about Cleo's 'behaviour'.
Bella denies all and warns Cleo.
But they bump into Don again at the pier and end up falling into the water where Don mistakes their tail for a type of large fish.
Bella escapes but Cleo is exposed to her father.
She has to explain all but Don swears to keep it a father and daughter secret.
Ep14- Emma V Bella
Emma suggests that Cleo and Rikki take turns to hang out with Bella and her separately.
Bella thinks it isn't fair.
Emma retrieves a photo album she made of her Cleo and Rikki.
Bella sees how happy they were and becomes jealous.
Emma doesn't mean for it to push her out.
Emma is upset when Cleo and Rikki go after Bella and Emma thinks it is all her fault, fleeing to the sea.
Ep15- Friendships
Rikki seeks advice from Sophie about Emma and Bella.
Bella and Emma avoid each other completely but Mako is stuck in the middle when both wish to spend time at the moon pool.