The BEST episodes of H2O: Just Add Water season 1

Every episode of H2O: Just Add Water season 1, ranked from best to worst by thousands of votes from fans of the show. The best episodes of H2O: Just Add Water season 1!

Season One: The lifes of three girls living on the Australian Gold Coast are changed forever. When Cleo, Emma and Rikki stumble upon a pool inside the dreaded Mako Island, a full moon transforms them and the next day they start turning into super powered mermaids! With the help of friend Lewis, the girls manage to control their powers and hide their secrets. But it becomes difficult with maddening full moons, nosey scientists and local bad boy Zane going on a quest to find them! Season Two: Following the incident with Dr Denman and the Lunar Eclipse, Emma, Cleo and Rikki want to go back to their normal lives. But when the full moon comes back, all three girls have a dramatic power change! Without Lewis, they could destroy themselves. But their friend is trying his best to help them, despite his relationship with geeky Charlotte. But Charlotte proves to be more of a threat when she learns about her grandmother being a mermaid and stumbles into the moon pool and becomes a mermaid herself!

Last Updated: 2/23/2024Network: Network 10Status: Ended
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A Twist in the Tail
star
8.35
62 votes

#1 - A Twist in the Tail

Season 1 - Episode 26 - Aired 12/29/2006

Dr. Denman sets up a trap for the girls at Mako Island and Zane is forced to decide who he should be helping.

Directors: Jeffrey Walker
Watch Now:AmazonApple TV
Dr. Danger
star
8.11
65 votes

#2 - Dr. Danger

Season 1 - Episode 25 - Aired 12/22/2006

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 well with her family. Meanwhile, with the return of Dr. Denman, Zane is closer than ever to cracking the girl's secret.

Directors: Jeffrey Walker
Writer: Sam Carroll
Watch Now:AmazonApple TV
Love Potion #9
star
7.98
57 votes

#3 - Love Potion #9

Season 1 - Episode 24 - Aired 12/15/2006

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 which is more important, magic and science.

Directors: Jeffrey Walker
Watch Now:AmazonApple TV
Red Herring
star
7.88
64 votes

#4 - Red Herring

Season 1 - Episode 21 - Aired 11/24/2006

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 date.

Directors: Jeffrey Walker
Watch Now:AmazonApple TV
Party Girls
star
7.87
106 votes

#5 - Party Girls

Season 1 - Episode 4 - Aired 7/28/2006

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 to convince her otherwise. Meanwhile, Lewis conducts experiments on the girls.

Directors: Colin Budds
Watch Now:AmazonApple TV
The Denman Affair
star
7.85
80 votes

#6 - The Denman Affair

Season 1 - Episode 8 - Aired 8/25/2006

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 information

Directors: Colin Budds
Watch Now:AmazonApple TV
Under the Weather
star
7.83
98 votes

#7 - Under the Weather

Season 1 - Episode 17 - Aired 10/27/2006

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 attention of doctors.

Directors: Jeffrey Walker
Writer: Max Dann
Watch Now:AmazonApple TV
Fish Out Of Water
star
7.81
64 votes

#8 - Fish Out Of Water

Season 1 - Episode 22 - Aired 12/1/2006

Emma and Cleo are concerned about Rikki going out with Zane. They force Rikki to decide to either be with Zane or with them.

Directors: Jeffrey Walker
Writer: Max Dann
Watch Now:AmazonApple TV
Something Fishy
star
7.81
89 votes

#9 - Something Fishy

Season 1 - Episode 5 - Aired 8/4/2006

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 to Mako Island to find out more about what happened to the girls.

Directors: Colin Budds
Writer: Jo Watson
Watch Now:AmazonApple TV
Bad Moon Rising
star
7.81
67 votes

#10 - Bad Moon Rising

Season 1 - Episode 18 - Aired 11/3/2006

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 moon and Zane finds her.

Directors: Jeffrey Walker
Writer: Sam Carroll
Watch Now:AmazonApple TV
Young Love
star
7.79
97 votes

#11 - Young Love

Season 1 - Episode 6 - Aired 8/11/2006

Emma gets into trouble babysitting her little brother Elliot. She goes to Lewis for help when Elliot develops a crush on Rikki.

Directors: Colin Budds
Writer: Sam Carroll
Watch Now:AmazonApple TV
In Too Deep
star
7.77
64 votes

#12 - In Too Deep

Season 1 - Episode 23 - Aired 12/8/2006

Rikki finds a locket that looks the same as Miss Chatham's in a Jewellery shop and she is determined to get it.

Directors: Jeffrey Walker
Watch Now:AmazonApple TV
Catch of the Day
star
7.73
176 votes

#13 - Catch of the Day

Season 1 - Episode 3 - Aired 7/21/2006

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 the nets, it causes the fisherman to think that there is a rogue shark roaming their ocean.

Directors: Colin Budds
Watch Now:AmazonApple TV
Hook, Line and Sinker
star
7.72
68 votes

#14 - Hook, Line and Sinker

Season 1 - Episode 20 - Aired 11/17/2006

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 trapped on a hotel balcony.

Directors: Jeffrey Walker
Writer: Max Dann
Watch Now:AmazonApple TV
Metamorphosis
star
7.68
186 votes

#15 - Metamorphosis

Season 1 - Episode 1 - Aired 7/6/2006

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 are given incredible powers over water that change their lives forever.

Directors: Colin Budds
Watch Now:AmazonApple TV
Pool Party
star
7.65
210 votes

#16 - Pool Party

Season 1 - Episode 2 - Aired 7/14/2006

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 Cleo into the pool. Lewis is the only one around to help so he finds out their secret.

Directors: Colin Budds
Writer: Deb Cox
Watch Now:AmazonApple TV
Moon Spell
star
7.65
97 votes

#17 - Moon Spell

Season 1 - Episode 7 - Aired 8/18/2006

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 mermaid under a full moon.

Directors: Colin Budds
Writer: Max Dann
Watch Now:AmazonApple TV
Sink or Swim
star
7.64
75 votes

#18 - Sink or Swim

Season 1 - Episode 11 - Aired 9/15/2006

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 current situation. Meanwhile, Lewis continues to experiment on the girls, which annoys Rikki.

Directors: Colin Budds
Writer: Max Dann
Watch Now:AmazonApple TV
Shipwrecked
star
7.63
71 votes

#19 - Shipwrecked

Season 1 - Episode 13 - Aired 9/28/2006

Emma invites Miss Chathams to stay at her place and Zane overhears Miss Chathams concerning about 'her treasure'.

Directors: Colin Budds
Watch Now:AmazonApple TV
The Camera Never Lies
star
7.59
75 votes

#20 - The Camera Never Lies

Season 1 - Episode 10 - Aired 9/8/2006

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 interviewing her mum and Zane and Lewis are planning to rennact Dr. Bennet's windsurfing record.

Directors: Colin Budds
Writer: Deb Cox
Watch Now:AmazonApple TV
Dangerous Waters
star
7.58
77 votes

#21 - Dangerous Waters

Season 1 - Episode 9 - Aired 9/1/2006

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 selling the fish for large profits.

Directors: Colin Budds
Watch Now:AmazonApple TV
The Big Chill
star
7.56
63 votes

#22 - The Big Chill

Season 1 - Episode 15 - Aired 10/13/2006

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 employee, Rikki.

Directors: Jeffrey Walker
Watch Now:AmazonApple TV
The Siren Effect
star
7.51
73 votes

#23 - The Siren Effect

Season 1 - Episode 12 - Aired 9/22/2006

The full moon gives Cleo a power to put guys in a 'trance' and she suddenly gets a rush of admirers.

Directors: Colin Budds
Watch Now:AmazonApple TV
Hurricane Angela
star
7.48
67 votes

#24 - Hurricane Angela

Season 1 - Episode 19 - Aired 11/10/2006

Cleo and Kim are stuck with their cousin Angela who wants to go body boarding and causes a bird brained distraction when Cleo refuses.

Directors: Jeffrey Walker
Watch Now:AmazonApple TV
Lovesick
star
7.44
66 votes

#25 - Lovesick

Season 1 - Episode 16 - Aired 10/20/2006

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 search for the 'sea monster' he saw.

Directors: Jeffrey Walker
Watch Now:AmazonApple TV