H2O: Just Add Water
Episodes
H2O: Just Add Water
Three teenage girls discover an underwater cavern on Mako Island and undergo a magical transformation.
The girls are trying to keep their fish tails a secret, but when socialite Miriam throws a pool party, all they can do is try to stay dry.
When the girls learn that sea turtles are getting caught in nets, it's Rikki and Emma to the rescue. But fishermen think they've got a shark problem.
While deciding to throw her annual sleepover party, Emma heads to Mako Island in search of a clue.
When Cleo's little sister gets ahold of Cleo's diary, she threatens to expose the three friends' secret.
Emma's younger brother, Elliot, develops a crush when he's saved from drowning.
A mysterious woman warns Cleo to steer clear of water and avoid looking at the full moon.
When Lewis takes a job as a research assistant to a noted marine biologist, the girls are worried that he might accidentally give away their secret.
When Rikki tries to catch a fish for Cleo, she takes on a job offer from a breeder to collect rare fish that isn't what it seems.
The girls participate in a film contest but the heroic theme leaves the group at odds.
A local surfing star asks Emma to be his swim coach but her secret makes her hesitant to dive into the role.
As a full moon approaches, Cleo flexes her new pipes and sings a siren song that has the boys all over town swooning.
Miss Chatham's mission to retrieve a precious piece of treasure lands her in a health emergency.
Cleo faces yet another birthday party thrown by her dad. Zane is out to learn the identity of the sea creature he thinks saved his life.
When Emma is put in charge of the café for a weekend, her new employee Rikki has a tough time adjusting to her managerial style.
Zane continues the search for his sea savior. Meanwhile, Cleo's family and friends are convinced she has a secret boyfriend.
On the day of a big biology exam, a thunderstorm has the girls faking sick to skip school.
Zane's investigation leads him to Mako Island, where he runs into a familiar face.
When Cleo's cousin Angela comes to visit, she proves to be a wild child thirsty for fun in the water.
When Lewis enters a fishing contest, Cleo's plan to help him win backfires.
Emma takes on a bold new hair color. Zane's sea monster mystery leads him to Miss Chatham and her old homestead.
When Cleo and Emma find out about Rikki's new romance, Rikki must make a tough choice.
When Rikki spies a locket with an uncanny resemblance to Cleo's in a jewelry shop, Zane doesn't understand her desperate desire to possess it.
Emma and Cleo hope that Byron and Lewis will ask them to the school dance. Meanwhile, Lewis comes up with a special formula for the girls.
Emma drops out of her family's annual vacation. Dr. Denman makes a discovery that brings her closer to the girls' secret.
Cleo, Emma and Rikki must evade a trap set by Dr. Denman.
With their final year of high school ahead, Cleo and Rikki make a new friend in Bella, meet new boy Will and encounter a strange force on Mako Island.
Will attempts to look into his experience on Mako Island, but Bella offers to direct him away from the moon pool to protect the girls' secret.
Cleo seeks a new job as an assistant dolphin trainer at the Marine Park. Meanwhile, Rikki takes issue with Nate's band playing at the cafe.
The girls each are experiencing trouble in love as Cleo's father, Don, finds a pretty prospect.
Zane hosts a dirt bike race to help the cafe bring in money. Lewis and Cleo continue with their moon pool investigation.
Bella sets up a study date with Will. Lewis pulls inspiration from the moon pool for his science project.
Cleo and Kim get to know their father's new girlfriend. Bella applies for a job at the cafe.
Cleo hosts a sleepover for the girls on the night of the full moon -- until they end up on a rescue mission for Bella.
Cleo experiments with the magic moon pool water. Rikki later gets the water into Cleo's aquarium by accident.
As Will begins to piece the mermaid mystery together, Bella tries to keep her secret from him.
When Bella helps Will with his diving, she tries to sort out his feelings for her. An unexpected booking has the cafe overrun with children.
When Rikki is held hostage, Will, Cleo and Bella must work together to save her.
Kim tries derailing Don and Samantha's wedding as Lewis receives an opportunity to study in America.
Will pushes himself too far when Zane challenges him to a free-diving competition. The girls discover a crystal in the rock from the moon pool.
Sophie swipes Bella's idea for a fundraising concert at the cafe.
Rikki goes to Mako Island to confront the strange force in the moon pool.
Cleo's introduced to Ryan, a young geophysicist working for Samantha. Rikki's time at the moon pool leads to a discovery about her powers.
Ryan sets out to explore Mako Island. To protect their secret, Rikki warns Bella and Cleo, and tries to stop Ryan from discovering the moon pool.
Will competes in the free-diving championship competition and breaks away from Sophie's influence.
Sophie lands a job at the cafe, to Bella's chagrin.
The girls must recover a necklace containing a magic crystal when someone steals it to get Rikki's attention.
When the full moon rises early, the girls confront the water force and receive a message about Mako Island.
A massive beach party leaves room for misunderstandings -- until real feelings come to light.
Cleo shows concern for her job when her father gets a second gig at the marine park.
The girls must force a comet away from Earth using the magnetic crystals' powers.
The girls get resourceful to prevent the impact of the comet. Will they save Earth before graduation?
Under the full moon, the girls undergo another transformation and must harness their newly enhanced powers.
A new girl moves to the Gold Coast. Emma gives Elliott an assist on the soccer field. Cleo and Lewis' relationship takes a turn.
Zane tries to win Rikki back. Cleo tries to find dirt on Charlotte.
Emma throws a wild house party. Nate offers to help Lewis with his hidden agenda.
When Lewis uncovers an old book on mermaids, he and the girls test a potion recipe to surprising results.
Cleo is wary of the woman her dad invites over for dinner, especially when it turns out to be Charlotte's mother.
When Rikki and Emma try to help Cleo, they end up on a search for a missing dolphin at the Marine Park.
Zane gets tangled in a sticky situation while Rikki is forced to admit the truth about her background.
When a horse falls ill, Emma gets resourceful. Lewis looks for a date to an awards dinner.
When Cleo fails an exam, she is assigned to a new tutor. Meanwhile, her feelings for Lewis get complicated.
A treasure hunt for a statue on the ocean floor with a hefty reward tests the girls' friendship.
When Emma pricks her finger on a barb of coral, she starts to act more and more like a fish. Lewis tries to find a cure.
Don takes the family camping on Mako Island during a full moon -- leaving the girls to try and fight off its effects.
The juice bar Emma works at gets a new manager. A rivalry starts for Lewis' affection.
Lewis and Zane discover a scent that attracts mermaids. The girls start becoming drawn to Nate.
Lewis is troubled by a dream about the mermaids being discovered. Meanwhile, Emma grows suspicious of Rikki and Ash's secret meetings.
Cleo and Rikki encourage Ash to make a bold romantic gesture for Emma -- but a full moon could thwart his plans.
When Zane and Ash clash, Rikki and Emma must choose sides. Cleo tries to organize a party celebrating the anniversary of their becoming mermaids.
Lewis tracks down a researcher to gain more insight into the girls' mermaid transformations.
The girls find an old reel of film from Max's research while Ash comes close to discovering Emma's secret.
Charlotte looks into her grandmother's past and makes her way to the moon pool.
When the girls befriend a fourth mermaid, they bond as part of their school's beach volleyball team -- but Cleo, Emma and Rikki still have reservations.
The girls try to stop Charlotte, who begins to use her powers recklessly, to prevent their secret from being exposed.
Charlotte organizes a surprise party for Lewis. Cleo and Emma get trapped in a flooded storage room.
When Charlotte meddles in Cleo and Lewis' friendship, Cleo runs away from home and gets caught in a dangerous situation.
An opportunity to remove the girls' mermaid powers for good presents itself.
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