Will's ruthless sister, Sophie, is training him to be a professional free-diver, only he'd rather spend time swimming with Bella. Irritated, Sophie tells Bella to stay away from Will, as she sees her as a distraction for him, but Bella doesn't listen. While watching Will train in a public pool, Bella dives in to help him with his swimming technique... just as Sophie turns up. Although Will manages to hide her, Bella is still worried, not about Sophie, but about Will. She thinks he only likes the mermaid side of her. Meanwhile, Rikki comes up with a brilliant idea to hold corporate events at the cafe, but after Zane makes a mistake with the booking, the cafe is overrun by a wild children's party.

Also, the crystals create a magnetic pull between each other and the Comet Eva that regularly pulls it to the Earth. Like the Moon Rings, and the Trident, the crystals' magic is likely finite, and needed to be replenished by being exposed to the moonlight from any suitable source.

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As Bella grows more and more fond of Will, she tries to set up a study date so that they can spend some time together, but is hurt to find herself stood up. Furious, she goes to Will's boatshed to confront him, and is devastated to find him there with another girl. Meanwhile, Lewis' science teacher, Ms. Taylor, is impressed by Lewis' science project – not realising that it is actually his apparatus for studying the floating water from the Moon Pool. Lewis is then forced to show his experiment in class, putting the secret of the Moon Pool and the mermaids in danger. Ignoring Rikki's advice, Bella follows Will and the mystery girl on a diving trip, and they nearly see her, but Bella is relieved when she discovers that the girl is Will's sister, Sophie. Cleo uses her power to help Lewis replicate the effect of the floating Moon Pool water, and he submits an alternative science project, keeping the mermaids' secret safe. Lewis is being troubled by recurring nightmares of Cleo being exposed as a mermaid, and it is clear that he still has feelings for her. Meanwhile, Elliot surprises everyone by asking Kim out on a date, and Lewis and Cleo act as chaperones when they go to the marine park. However, Lewis' nightmare comes true when Cleo falls into the water, and someone spots her. Elsewhere, Emma grows suspicious when she discovers that Rikki has been having secret meetings with Ash... but it turns out the two of them were only planning to give her an award. In some countries, such as Hungary, Romania and Bulgaria, the episodes "Three's Company", "Sea Change" and "Unfathomable" are combined into a 70-minute television movie. This version aired only in Central and Eastern Europe on Jetix. Cleo counts down the days to her sixteenth birthday, not with excitement, but with dread. Emma and Rikki can't understand Cleo's mood, until Lewis tells them about Cleo's father's embarrassing birthday parties. Meanwhile, Zane is determined to find the "sea monster" that saved him from drowning, and recruits Lewis to help him. But Lewis has promised the girls that he will keep Zane as far away from Mako Island and them as possible. In Mako: Island of Secrets, the crystals are encrusted in the Moon Rings used by the mermaids and the Trident as the magic sources of these objects.

Also, they no longer are attracted to each other through magnetism. It is possible that they were enchanted to resist its magnetic pull for specific purposes. Note: Claire Holt left the series to film Messengers 2: The Scarecrow. Indiana Evans and Luke Mitchell join the main cast.

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While dirt biking through a caravan park, Zane and Nate spot a rundown Harley-Davidson motorcycle, and Nate steals the badge. A guilty Zane, however, tries to return the badge, but is caught by the owner, who thinks he is the thief. Zane has an argument with the man, and insults him... not realising that he is girlfriend Rikki's father, and that the caravan park is where Rikki lives; but she has been too embarrassed to admit it. When Zane finds out, he tells Rikki that he doesn't care where she comes from or how much money she has, but her father doesn't approve of Zane, and keeps them apart. Meanwhile, Cleo begins to suspect that Charlotte and Lewis are secretly going out. In the United States "Dr. Danger" and "A Twist in the Tail" premiered as a one-hour movie called "Exposed". Now that the mermaids have been identified, Dr. Denman continues her pursuit of them by holding Lewis hostage on her boat and using his mobile phone to lure the girls to the Moon Pool, where she traps them. After discovering that the three mermaids are in fact Rikki and her friends, Zane is left torn about where his loyalties lie; with his father, or with Rikki. Eventually, his conscience leads him to set Lewis and the girls free (much to his father and Dr. Denman's annoyance), but the mermaids are not out of trouble yet. Knowing that Dr. Denman and the scientists will still come after them, the girls must make a tough decision. Miss Chatham tells them of the forthcoming lunar eclipse, and says that, if they enter the Moon Pool when the eclipse passes over it, it will draw their powers away from them. As normal girls, the three of them would be of no interest to the scientists, and would be out of danger. The girls make the choice to enter the pool, and while their powers seem to vanish completely, the next morning they find they've become mermaids again: the eclipse only affected them for 12 hours. The following is an episode list for the Australian television show H 2O: Just Add Water, which first aired on Network Ten in Australia and has since been broadcast in more than 120 countries worldwide. Series one premiered in Australia on 7 July 2006 and series two began there on 28 September 2007. The third series premiered in the United Kingdom on 26 October 2009 while its Australian premiere occurred on 22 May 2010.

Rikki is bothered by Zane's reappearance on the Gold Coast, as she realises she still likes him. With Zane thinking that Rikki gave up her mermaid powers at the lunar eclipse during the war with Dr. Denman, can she manage to keep her secret from him for a second time? Meanwhile, Cleo grows jealous when she sees that Lewis and Charlotte are becoming close friends, and, in a mad rage, she steals Charlotte's diary... and discovers that she apparently already has a boyfriend named RJ. The episode ends with Zane rediscovering that Rikki is a mermaid, when Nate blasts her with water, but he promises not to tell anyone, and they rekindle their relationship. Cleo ends up embarrassing herself when she confronts Charlotte about her secret other boyfriend, and learns that the dates in the diary are meetings for Charlotte's theatre group (RJ stands for Romeo and Juliet).

When Kim demands an expensive holiday, Cleo's father gets a second job doing a pirate show at the marine park, so that he can afford it. At first, Cleo is worried that her father will humiliate himself; but when the dolphin shows start emptying out, Cleo realises that her father is more popular than she thought, and his shows threaten to end Cleo's job. Meanwhile, there is trouble between Bella and Will, when they struggle to find things in common. Cleo and Kim's father Don takes them to the beach to get to know his new girlfriend, Sam. But while Cleo is willing to accept her for her father's sake, Kim hates her from the start, but uses the situation to get expensive gifts out of her father as bribes for her approval, much to Cleo's disgust. But Sam and Don get the wrong idea when Cleo refuses to go swimming with Sam, and think that Cleo is the one who has a problem with her. Meanwhile, Bella applies for a job at the cafe, and Rikki is keen to give it to her... except Zane wants to give the job to Will's ambitious sister, Sophie. Emma is flattered when local surfing hero, Byron, asks her to train him up for a swimming competition, but has to turn him down for obvious reasons. However, she changes her mind after learning that Zane is boasting to everyone that he will beat Byron by a mile, and begins training Byron without getting in the pool herself. But Byron is disappointed when Emma turns into a 'heavy training dragon', and the pair nearly fall out. Emma takes advice from her friends not to be so hard on Byron, but by being nice to him, she gives him the wrong idea, and they end up kissing. Meanwhile, Lewis continues his research on the girls, but Rikki does not like him treating her as a specimen, and tries to annoy him by disrupting his experiments. When Emma's parents head off to a crystal-wear convention, she is left in charge of the house, and invites Cleo to stay... but instead ends up with the messy and rebellious Rikki. However, when Rikki criticises Emma for being a control-freak, Emma sets out to prove that she can have fun too, and throws a wild party at her house. But she starts to regret her decision when the party gets out of hand. Meanwhile, Nate convinces Lewis that Cleo broke up with him because he wasn't manly enough, and offers to teach him judo. But the lessons are actually a ploy to keep Lewis away from Cleo, so that Nate can flirt with her. With the school's end of year dance approaching, Emma takes up the stressful job of heading up the dance committee. But, while the tough task of organising the dance is bad enough on her nerves, she is also flattened by the news that Byron, who she was hoping would ask her to the dance, is already going with Ice Queen Miriam. Cleo is also disappointed that Lewis is too caught up in his experiments to ask her to the dance, and, rather than go alone, she is forced to ask Nate. The only upside is that Lewis, after days of research and testing, has come up with a formula to make the girls' skin waterproof, and they no longer have to worry about getting wet. But, as the wise Miss Chatham declares, science and magic cannot mix, and Lewis' formula gives the girls an allergic reaction where their skin turns red, and they are forced to flee the dance. Things turn out well in the end, however, as Cleo finally admits to Lewis how she feels about him, and they become a couple.

Cleo and Kim are concerned when it seems that their father has found a new girlfriend. With no desire for a step-mother, the girls are horrified when their father invites the woman over for dinner; but Cleo is even more horrified to discover that she is Charlotte's mother! Feeling that desperate times call for desperate measures, Cleo invites Rikki and Emma round, and persuades them to use their powers to ruin her father's dinner. Only afterwards do the girls realise their mistake; Charlotte's mother was a business associate of Cleo's father, interested in buying some of his catch. When Lewis tells Cleo not to experiment with the floating water they collected from Mako, she cannot resist, and sends Lewis off for a day of golfing with her father, so that he won't discover her. But when Rikki accidentally gets the water in Cleo's fish tank, her goldfish, Hector, becomes imprisoned in a bubble of floating water! The girls' attempts to free Hector result in him going down the drain, and they must use their mermaid abilities to retrieve him from the canal. Also, the girls try to keep Will, who is in the house while looking for Bella with whom he has to do a project for school, from seeing Hector. Meanwhile, somewhere on the golf course, Lewis is pretending to lose to Cleo's father at golf, so that he can get into his good books.Emma and Rikki use their new-found abilities to free hatchling sea turtles caught in fishing nets. But when they shred one of the nets with a knife, they spark stories of sharks patrolling the waters. Meanwhile, Emma and Rikki have bad news for Cleo; the fishing boat that caught the turtle in its net was her father's. Refusing to believe that her father is illegally catching turtles, Cleo swims after his boat to investigate and at last accepts what she is. But the fishermen on board the boat mistake Cleo for a shark and catch her in their net. Emma and Rikki rescue her and Cleo is no longer afraid to swim in the water. Lewis and the girls enter a short film contest held at the JuiceNet cafe, but Lewis, last year's champion, is fresh out of ideas. Rikki and Cleo are roped into doing a film about Emma's mother, but Rikki, thinking that the film is boring, sneaks off to shoot her own film, featuring some impressive underwater footage of sharks. Meanwhile, Zane, ineligible to compete himself, as his father is on the judging panel, recruits Lewis to shoot a film of him windsurfing around Mako Island, recreating (and hopefully beating), his father's windsurfing record of several years before. But things don't go to plan, when Zane falls off his windsurfer, right in the middle of Mako Island's shark breeding ground.