The Best Episodes of H2O: Just Add Water

Unfathomable

#1 - Unfathomable 8.85

Season 2 - Episode 26

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 shows immunity and tries to reveal the girls' secret before Lewis takes her to Mako Island. The girls follow and a battle erupts. But who will win?

Three's Company

#2 - Three's Company 8.83

Season 2 - Episode 24

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 and it is up to her to save the day.

Kidnapped

#3 - Kidnapped 8.80

Season 3 - Episode 8

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 to the moon pool after making the connection between his previous encounter with the moon pool waterfall and the timing of the full moon.

Directors: Jeffrey Walker
Sea Change

#4 - Sea Change 8.70

Season 2 - Episode 25

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 and she runs away and gets lost. When he is informed, Lewis must make up his mind: Cleo or Charlotte?

Crime & Punishment

#5 - Crime & Punishment 8.64

Season 3 - Episode 12

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 secret to Will so they can rescue Rikki together.

Directors: Jeffrey Walker
Too Close for Comfort

#6 - Too Close for Comfort 8.62

Season 3 - Episode 24

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 Will find difficulty trying to connect with each others' interests.

Directors: Colin Budds
Revealed

#7 - Revealed 8.60

Season 3 - Episode 10

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 close Will is to finding out their mermaid secret and warns Bella to stay away from Will.

Directors: Jeffrey Walker
A Date With Destiny

#8 - A Date With Destiny 8.58

Season 3 - Episode 25

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 Moon Pool and discover the comet will collide with earth. Sophie meets Ryan and with Zane's help they join forces to remove the crystals from the Moon Pool.

Directors: Colin Budds
Queen for a Day

#9 - Queen for a Day 8.55

Season 3 - Episode 20

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 problem and looks to fire Bella and the band.

Directors: Colin Budds
Into the Light

#10 - Into the Light 8.54

Season 3 - Episode 18

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 stop Ryan from discovering the crystals in the Moon Pool.

Directors: Colin Budds
A Magnetic Attraction

#11 - A Magnetic Attraction 8.46

Season 3 - Episode 17

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 fracture begins to appear in the trio.

Directors: Colin Budds
To Have & To Hold Back

#12 - To Have & To Hold Back 8.45

Season 3 - Episode 13

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 own life and let him go overseas.

Directors: Jeffrey Walker
Bubble, Bubble, Toil and Trouble

#13 - Bubble, Bubble, Toil and Trouble 8.40

Season 2 - Episode 22

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 Education.

The Dark Side

#14 - The Dark Side 8.36

Season 3 - Episode 16

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 Cleo and Bella delayed, Will pursues her and discovers she's been affected by the experience.

Directors: Colin Budds
Breakaway

#15 - Breakaway 8.31

Season 3 - Episode 19

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 kissing Zane at the event and breaks off their relationship.

Directors: Colin Budds
The Sorcerer's Apprentice

#16 - The Sorcerer's Apprentice 8.29

Season 3 - Episode 9

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 bubble of floating water. Meanwhile, Lewis has to play golf with Cleo's father.

Directors: Jeffrey Walker
Under the Weather

#17 - Under the Weather 8.25

Season 1 - Episode 17

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
Mako Masters

#18 - Mako Masters 8.25

Season 3 - Episode 22

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 water force in the Moon Pool and are given a message about Mako Island.

Directors: Colin Budds
The Gracie Code (2)

#19 - The Gracie Code (2) 8.21

Season 2 - Episode 20

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 discovery from inside Max's research brings her to the secret! Meanwhile, Ash decides to help Emma with her "fear of water."

And Then There Were Four

#20 - And Then There Were Four 8.13

Season 2 - Episode 21

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 having trouble trying to keep their relationship together.

Reckless

#21 - Reckless 8.13

Season 2 - Episode 23

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 into her own hands when Nate causes trouble for Lewis.

Happy Families

#22 - Happy Families 8.06

Season 3 - Episode 7

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 the fact that her father is happy in order to get lots of gifts. Will's sister Sophie competes with Bella to get the job Bella wanted at Rikki's Cafe.

Directors: Jeffrey Walker
Pool Party

#23 - Pool Party 7.95

Season 1 - Episode 2

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
The One That Got Away

#24 - The One That Got Away 7.93

Season 2 - Episode 3

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 Lewis and Cleo worries for their secret.

Directors: Jeffrey Walker
The Heat is On

#25 - The Heat is On 7.92

Season 2 - Episode 18

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 Ash and Zane and Cleo may have to celebrate alone.