H2O: Just Add Water_
H2O: Just Add Water revolves around three teenage girls facing everyday teen problems with an added twist: they cope with the burden of growing a giant fin and transforming into mermaids whenever they come in contact with water.
Created By
Jonathan M. Shiff
Network
10
Episodes
78
Updated Feb 16, 2026
WHERE TO WATCH
Netflix
18 countries
Prime Video
8 countries
Hoopla
FREE
2 countries
RTL+
1 country
Z
ZDF Select Amazon Channel
1 country
Z
ZDFtivi Amazon channel
1 country
ALL REGIONS
DROPTHE_ GOSSIP
Overview
H2O: Just Add Water has 3 seasons with 78 episodes spanning 2006-2010.
Phoebe Tonkin →
Rating
With a 7.8/10 rating from 690 votes, H2O: Just Add Water is considered highly rated.
Year context
H2O: Just Add Water first aired 20 years ago in 2006.
CAST (5)
SEASONS (3 seasons, 78 episodes)
SEASON 1
01
Metamorphosis
Three very different teenage girls, Emma, Cleo and Rikki, facing everyday teenage problems. With a twist: they're mermaids; after discovering a magic place where they…
02
Pool Party
Annoying Miss Popularity, Miriam, is having a pool party and the girls want to go. But being around water is risky, especially when Zane tosses…
03
Catch of the Day
Rikki, Emma and Cleo discover that sea turtles are being captured by fishing nets. When Rikki and Emma attempt to rescue the turtles by cutting…
04
Party Girls
Emma decides that she is not going to have her annual sleepover party due to what has happened to them. But Rikki and Cleo try…
05
Something Fishy
Cleo's sister Kim finds her diary and thinks that Cleo and her friends are 'evil mermaids' and she plans to tell everyone. Meanwhile, Lewis goes…
06
Young Love
Emma gets into trouble babysitting her little brother Elliot. She goes to Lewis for help when Elliot develops a crush on Rikki.
07
Moon Spell
Miss Chatham gives Cleo a warning that she doesn't quite understand. Until Emma finds herself in a trance and unable to change back from a…
08
The Denman Affair
Lewis is offered a great job with a marine biologist, but the girls are concerned that his interest will cause him to reveal too much…
09
Dangerous Waters
Rikki is offered a job to collect rare fish. At first it seems perfectly fine, until she finds out the person that hired her is…
10
The Camera Never Lies
Rikki enters a short film contest on the theme of 'Heroes' and decides to capture some nice underwater footage with her 'abilities'. Meanwhile, Emma is…
11
Sink or Swim
Byron asks Emma for help with training the school's swimming team and Emma has some trouble deciding whether or not to help out in her…
12
The Siren Effect
The full moon gives Cleo a power to put guys in a 'trance' and she suddenly gets a rush of admirers.
13
Shipwrecked
Emma invites Miss Chathams to stay at her place and Zane overhears Miss Chathams concerning about 'her treasure'.
14
Surprise!
Cleo's 16th birthday is approaching and she thinks that her father is going to throw another embarrasing birthday party. Meanwhile, Zane tries to find the…
15
The Big Chill
Emma is doing well at her new job at the JuiceNet cafe, but when she is left in charge, she has trouble managing her new…
16
Lovesick
Rumour has it that Cleo has a boyfriend and her friends and family are trying to find out who he is. Meanwhile, Zane continues his…
17
Under the Weather
The girls have to fake sick as a result of a thunderstorm, so their secret won't be discovered at school. But their 'sickness' attracts the…
18
Bad Moon Rising
Zane's quest to find the 'sea monster' has led him to Mako Island. Rikki loses control of her powers as a result of the full…
19
Hurricane Angela
Cleo and Kim are stuck with their cousin Angela who wants to go body boarding and causes a bird brained distraction when Cleo refuses.
20
Hook, Line and Sinker
Lewis enters the annual fishing derby. When Cleo sees him struggling, she decides to help him out with disastorous consequnces. Meanwhile, Rikki and Zane are…
21
Red Herring
Emma decides to change her look by colouring her hair red. Though nothing is that simple when you're half-mermaid. Zane asks Rikki out on a…
22
Fish Out Of Water
Emma and Cleo are concerned about Rikki going out with Zane. They force Rikki to decide to either be with Zane or with them.
23
In Too Deep
Rikki finds a locket that looks the same as Miss Chatham's in a Jewellery shop and she is determined to get it.
24
Love Potion #9
With the school dance coming up, Emma and Cleo hope Byron and Lewis will ask them out. Meanwhile, Miss Chatham and Lewis are arguing about…
25
Dr. Danger
It's time for Emma's family's annual vacation trip, but she can't go as the risks are too high. But all her excuses don't go very…
26
A Twist in the Tail
Dr. Denman sets up a trap for the girls at Mako Island and Zane is forced to decide who he should be helping.
SEASON 2
01
Stormy Weather
With Cleo's parents now divorced, Cleo is ordered by her dad to take more care of Kim, starting with taking her to a concert. But…
02
Control
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…
03
The One That Got Away
Rikki tries to avoid Zane when he comes back, but needs his help after an incident with a speedboat. Meanwhile, Charlotte continues to flirt with…
04
Fire and Ice
Trouble arises when Emma throws a party to prove she is as fun as Rikki. Meanwhile, Lewis is trying to prove his manhood and Cleo…
05
Hocus Pocus
Trouble is in the air as the Setori's start to suffer and the JuiceNet is endangered by a new bar. But when Lewis finds a…
06
Pressure Cooker
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!…
07
In Hot Water
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…
08
Wrong Side of the Tracks
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…
09
Riding for a Fall
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…
10
Missed the Boat
Cleo starts to struggle at school and gets help from the new tutor. But there are bigger problems when Charlotte starts to get closer to…
11
In Over Our Heads
In need of cash, Rikki decides to go and searching for a lost statue with a huge reward. But she lies to Emma and Cleo,…
12
Fish Fever
Emma gets poisioned after cutting her finger on some coral and she begins to turn into a white scaled monster! Meanwhile Charlotte thinks Cleo is…
13
Moonwalker
On the night of a full moon, Lewis, Emma, Rikki and Charlotte accompany Cleo's family for a camping trip at Mako. When all three girls…
14
Get Off My Tail
Cleo decides to restart her friendship with Lewis and embrace her abilities, while Emma is shocked with the new supervisor who has big changes planned.
15
Irresistable
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…
16
Double Trouble
Lewis is puzzled when he dreams about Cleo being photographed by people. Later, he and Cleo take Eliot and Kim to the marine park. Meanwhile,…
17
Moonstruck
It's full moon and the girls insist that they don't need Lewis to assit his help as all three girls are staying at Emma's and…
18
The Heat Is On
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…
19
The Gracie Code (1)
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…
20
The Gracie Code (2)
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…
21
And Then There Were Four
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…
22
Bubble Bubble, Toil and Trouble
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…
23
Reckless
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…
24
Three's Company
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…
25
Sea Change
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…
26
Unfathomable
A unusual and rare planetary alingment is set to cause the full moon to remove a mermaids powers if they enter the moon pool! Charlotte…
SEASON 3
01
The Awakening
Cleo and Rikki enter their final year of high school. They make friends with a new girl, Bella, and a new boy, Will. However, they…
02
Jungle Hunt
With Will finding out about Mako Island, Bella tries to misdirect his search so that he will not discover the Moon Pool. However, Lewis and…
03
Keep Your Enemies Close
At the marine park, Cleo seeks a job as a dolphin trainer. Meanwhile, until she and Bella reach an understanding, Rikki fires Nate's band, preventing…
04
Valentines Day
Cleo has to put off Lewis' romance plans in order to help Kim with her crazy love life. Meanwhile, Don meets up with a National…
05
Big Ideas
To get more interest in the cafe, Zane develops a dirt bike race. However, Rikki finds out that it is a scam. She and Bella…
06
Secrets & Lies
Bella tries to get close to Will but when Bella goes to his place she sees him with another girl. Meanwhile Lewis tries to test…
07
Happy Families
Cleo's family and Sam go on a picnic to the beach, which leads to tension when Cleo refuses to go near the water. Kim abuses…
08
Kidnapped
During a full moon, the girls stay at Cleo's and Bella is attacked by the water creature. At the same time, Will decides to return…
09
The Sorcerer's Apprentice
Cleo starts to experiment on the moon pool water without Lewis' knowledge, but things start going wrong when Cleo's fish Hector gets trapped in the…
10
Revealed
After Bella gives Will a shell-like fossil she found while swimming, Will becomes suspicious as the fossil is of a rare kind. Rikki realises how…
11
Just A Girl At Heart
Bella helps Will with his free-diving training but when she realises he's more interested in her as a mermaid than a girl, she's hurt. Rikki…
12
Crime & Punishment
Rikki receives counterfeit money at the cafe and is held captive by criminals on a boat. Bella and Cleo are forced to reveal the trio's…
13
To Have & To Hold Back
Kim attempts to derail Don and Samantha's wedding. Lewis receives an opportunity to study in America. Cleo realises she's got to let Lewis live his…
14
Mermaid Magic
Will pushes himself too far when Zane challenges him to prove his skills as a free- diver. The girls discover a unique crystal in the…
15
Power Play
Sophie uses Bella's idea for a fundraising concert and presents it as her own to Rikki to gain publicity for the cafe. Cleo's caught in…
16
The Dark Side
Rikki's frustrated by the water attacks and goes to Mako Island on a full moon to confront the strange force in the Moon Pool. With…
17
A Magnetic Attraction
Cleo's introduced to Ryan, a young geophysicist who's working for Samantha. Rikki doesn't react well to Cleo consulting Ryan about the Mako rock and a…
18
Into The Light
Rikki fears Ryan's explorations on Mako Island will uncover their secrets but Cleo and Bella discount her concern. She almost goes too far trying to…
19
Breakaway
Will competes in the Free-Diving Championships but afterward chooses to break from the sport and shrug off Sophie's influence on his life. Rikki sees Sophie…
20
Queen For A Day
Zane installs Sophie as head of staff at the cafe. Bella develops a sneezing allergy that also accidentally triggers her powers. Sophie seizes on the…
21
The Jewel Thief
The girls discover the Mako crystals contain immense energy and need to mount a rescue mission when Zane jealously steals one in an effort to…
22
Mako Masters
The girls sit their final school exams and have to avoid a water attack in public when the full moon rises early. They confront the…
23
Beach Party
Bella's eager to ask Will to the end of year party until she sees him asking Rikki. A big misunderstanding occurs which prompts Will to…
24
Too Close For Comfort
Don gets a second job at the Marine Park on the Pirate ship and outshines Cleo, threatening the future of her Dolphin show. Bella and…
25
A Date With Destiny
Cleo discovers a comet is causing fish to flee the waters around Mako Island. The girls find a way to restart the message in the…
26
Graduation
Sophie and Ryan damage the Moon Pool in their efforts to obtain the rare crystals. The girls improvise and use their own magic to prevent…
SERIES INFO
3
Seasons
78
Episodes
24 min/ep
Per Episode
Ended
Status
CREW
Creator
Jonathan M. Shiff
NETWORKS (1)
10
DETAILS
FREQUENTLY ASKED QUESTIONS
What is H2O: Just Add Water about?
H2O: Just Add Water revolves around three teenage girls facing everyday teen problems with an added twist: they cope with the burden of growing a giant fin and transforming into mermaids whenever they come in contact with water.
Where can I watch H2O: Just Add Water?
H2O: Just Add Water is available on Netflix, Prime Video, Hoopla, RTL+, ZDF Select Amazon Channel . Availability varies by region.
How many seasons does H2O: Just Add Water have?
H2O: Just Add Water has 3 seasons with 78 episodes total.
Who created H2O: Just Add Water?
H2O: Just Add Water was created by Jonathan M. Shiff.
Who stars in H2O: Just Add Water?
The cast of H2O: Just Add Water includes Phoebe Tonkin, Cariba Heine, Indiana Evans, Luke Mitchell, Burgess Abernethy.
What is the rating of H2O: Just Add Water?
H2O: Just Add Water has a rating of 7.8 out of 10 based on 690 votes on TMDB.
Is H2O: Just Add Water still running?
H2O: Just Add Water has ended. The final episode aired on .
GENRES (3)
Drama
Family
Sci-Fi & Fantasy
