When Emma's mother makes her take her brother Elliot for riding lessons, she ends up getting into a competitive conflict with the riding instructor, Ash (who Rikki and Cleo are convinced she has a crush on). However, Emma's stubbornness towards Ash lands her in trouble, when she ignores a warning from him, and accidentally lets his horse, Rebel, eat some poisonous weeds. Meanwhile, Lewis wins an award for young inventors, and asks Cleo to accompany him to the awards ceremony, but she declines, saying that they are just friends now. Lewis instead decides to take Charlotte as his date, but then Cleo changes her mind, and accepts Lewis' invitation, not realising that Charlotte is going in her place.

With the arrival of the girls' one year anniversary as mermaids, Cleo organises a party at Mako Island to celebrate. But when Zane accidentally spills some drinks on Emma at the cafe, he is forced to have an argument with Ash to stop him from seeing her as a mermaid. Overhearing Zane calling her a 'clumsy waitress', Emma doesn't realise he is only trying to help her, and gives him the cold shoulder. This leads to Emma and Zane's girlfriend Rikki becoming enemies, and it looks like there will be no party at Mako Island, which upsets Cleo. Meanwhile, Lewis feels guilty when he realises he hasn't been spending much time with Charlotte. A full moon, in conjunction with a rare planetary alignment, calls the girls to the moon pool at Mako Island where their powers are greatly augmented and strengthened. The second series revolves around the arrival of a new girl, Charlotte Watsford ( Brittany Byrnes), who moves into the area and develops an instant attraction to Lewis. After Charlotte sees a film of her grandmother Gracie as a mermaid she meets Max Hamilton ( Martin Vaughan) who was once romantically involved with Gracie. Happy to have met his lover's granddaughter, he tells her about the previous mermaids—Louise, Julia, and Gracie—and of Mako Island. Charlotte travels to the moon pool during a full moon and becomes the fourth mermaid in possession of all the girls' powers. Believing herself superior, she and the girls become sworn enemies. This conflict results in a confrontation during an especially powerful full moon, which ends with Charlotte being permanently stripped of her mermaid form and abilities. 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.

In the United States "Dr. Danger" and "A Twist in the Tail" premiered as a one-hour movie called "Exposed". The day of Don and Sam's wedding arrives, and selfish Kim tries to ruin everything. Meanwhile, Lewis gets the chance to spend three years working at a scientific research centre in America, but frets about telling Cleo... until Kim tells her for him. Cleo is distraught, thinking that Lewis planned to leave without telling her, and refuses to talk to him. Don and Sam's big day is then completely ruined when Kim turns on the sprinklers (nearly making Cleo, Rikki and Bella grow tails in front of everyone). In the end, Lewis tells Cleo that he is not going to America because he loves her, and Cleo forgives him. But she decides to let him go after all, and they part promising to see each other again. The girls organise another wedding ceremony for Don and Sam on Mako Island, and Kim at last warms to Sam. 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. 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.

After seeing the work done at the marine park by the charity Dolphin Rescue, Bella comes up with an idea to hold a fundraising event for them at the cafe, but is deflated when Sophie overhears, and steals her idea, presenting it to Rikki and Zane as her own. What is more, as Sophie is organising the event, she spitefully refuses to let Bella and the band perform. But she gets into trouble with Rikki and Zane, when all of the bands she has booked instead of Bella's pull out, after hearing that Sophie has tried to make Dolphin Rescue pay a fee for the concert. Sophie is fired from the cafe, and Bella and the band perform to save the night. Meanwhile, Cleo, Sam, and Kim have difficulties sharing the bathroom, until Sam realizes what Kim is up to and finds a way to repay her for Cleo after Kim gets her in trouble. 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. 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.

Required Cookies & Technologies

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. 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 Rikki and Cleo realise that Will has made a connection between Bella, Mako, and the full moon, they warn Bella to stay away from him, but she can't. Will is also growing incredibly interested in her, and wants to spend time with her; but when he realises that Bella won't swim, he deliberately spills some water on her, thinking her secret might be something to do with water. In a panic, Bella dives into the water, but Will follows her... and discovers that she is a mermaid. Afterwards, Bella tells Will how she became a mermaid. Can he keep her secret? 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 third series begins with Cleo and Rikki dealing with the loss of Emma who is travelling the world with her family. New characters are introduced including Bella Hartley ( Indiana Evans), a singer and mermaid since the age of nine with the power to turn water into gelatine; and Will Benjamin ( Luke Mitchell), a skilled diver who is trying to figure out the secrets of Mako Island and who accidentally seems to unleash a powerful force which turns water against the mermaids. The girls must also deal with Zane, who attempts to exploit the moon pool after Rikki breaks up with him. [2] [3] No. overall 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.Note: Claire Holt left the series to film Messengers 2: The Scarecrow. Indiana Evans and Luke Mitchell join the main cast. 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. While Rikki enjoys her new life as a mermaid, Emma and Cleo are less enthusiastic about their mermaid powers. Emma's swimming career is in jeopardy, and Cleo feels isolated when she realises that she can't go to fashionable Miriam's pool party. Rikki soon gets fed up with their moaning, storms off and accidentally discovers a power of her own. Meanwhile, Cleo wants to tell her friend, Lewis, about her powers, but Emma and Rikki forbid it. However, Cleo might need his help after all when she takes a risk and attends Miriam's pool party, only to get thrown in the pool by prankster Zane Bennett and his pal Nate, just as Lewis arrives. Lewis discovers that the girls are mermaids but promises to keep their secret. Cleo is devastated when she fails a biology exam, and realises that it was all because she did not have Lewis to tutor her. Cleo's father then schedules Cleo a re-sit for the exam, and also finds her a new tutor... Charlotte. Determined to keep Cleo and Lewis apart, Charlotte sets Cleo a whole weekend of studying, and then takes Lewis to paint with her... on Mako Island. The girls try to stop Lewis from taking her there, but he refuses, thinking they are being paranoid. Cleo sneaks off from studying to go with Emma and Rikki to Mako, and try to keep Charlotte from discovering too much. But she ends up with her heart broken when she falls into a stream, and looks up to see Lewis kissing Charlotte (not realising that he only did it to stop Charlotte from seeing her as a mermaid).