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The Best Episodes of H2O: Just Add Water

Every episode of H2O: Just Add Water ranked from best to worst. Let's dive into the Best Episodes of H2O: Just Add Water!

Binge this in 1d 7h•Peaking at 8.6/10

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

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Episode Rankings

  1. #1 Fan Favorite
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    H2O: Just Add Water Season 2 Episode 26 - Unfathomable
    8.6/10(257 votes)

    S2:E26

    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?

    Director:Unknown
    Writer:Unknown

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  2. H2O: Just Add Water Season 2 Episode 8 - Wrong Side of the Tracks
    8.5/10(238 votes)

    S2:E8

    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 with her grouchy father.

    Director:Unknown
    Writer:Unknown

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  3. H2O: Just Add Water Season 2 Episode 25 - Sea Change
    8.5/10(227 votes)

    S2:E25

    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?

    Director:Unknown
    Writer:Unknown

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  4. H2O: Just Add Water Season 1 Episode 26 - A Twist in the Tail
    8.4/10(257 votes)

    S1:E26

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

    Director:Jeffrey Walker
    Writer:Unknown

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  5. H2O: Just Add Water Season 2 Episode 11 - In Over Our Heads
    8.3/10(241 votes)

    S2:E11

    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, which causes danger when Rikki is knocked out!

    Director:Unknown
    Writer:Unknown

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  6. H2O: Just Add Water Season 2 Episode 19 - The Gracie Code (1)
    8.3/10(208 votes)

    S2:E19

    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 Lewis reveal the girls secret to him in order to complete the puzzle?

    Director:Unknown
    Writer:Unknown

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    The 20 WORST Episodes of H2O: Just Add Water

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  7. H2O: Just Add Water Season 1 Episode 18 - Bad Moon Rising
    8.1/10(252 votes)

    S1:E18

    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.

    Director:Jeffrey Walker
    Writer:Unknown

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  8. H2O: Just Add Water Season 2 Episode 17 - Moonstruck
    8.1/10(203 votes)

    S2:E17

    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 Ash is coming over. When Cleo and Rikki fall under the moon spell, can Lewis stop them from revealing their secret to Ash?

    Director:Unknown
    Writer:Unknown

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  9. H2O: Just Add Water Season 2 Episode 24 - Three's Company
    8.1/10(193 votes)

    S2:E24

    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.

    Director:Unknown
    Writer:Unknown

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  10. H2O: Just Add Water Season 3 Episode 13 - To Have & To Hold Back
    8.1/10(176 votes)

    S3:E13

    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.

    Director:Jeffrey Walker
    Writer:Unknown

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  11. H2O: Just Add Water Season 1 Episode 22 - Fish Out Of Water
    8.0/10(231 votes)

    S1:E22

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

    Director:Jeffrey Walker
    Writer:Unknown

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  12. H2O: Just Add Water Season 1 Episode 23 - In Too Deep
    8.0/10(237 votes)

    S1:E23

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

    Director:Jeffrey Walker
    Writer:Unknown

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  13. H2O: Just Add Water Season 1 Episode 25 - Dr. Danger
    8.0/10(233 votes)

    S1:E25

    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.

    Director:Jeffrey Walker
    Writer:Unknown

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  14. H2O: Just Add Water Season 3 Episode 12 - Crime & Punishment
    8.0/10(179 votes)

    S3:E12

    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.

    Director:Jeffrey Walker
    Writer:Unknown

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  15. H2O: Just Add Water Season 3 Episode 26 - Graduation
    8.0/10(200 votes)

    S3:E26

    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 the impact of the comet and a planet wide catastrophe. Rikki, Cleo and Bella graduate with a surprise.

    Director:Unknown
    Writer:Unknown

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  16. H2O: Just Add Water Season 1 Episode 21 - Red Herring
    7.9/10(228 votes)

    S1:E21

    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.

    Director:Jeffrey Walker
    Writer:Unknown

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  17. H2O: Just Add Water Season 1 Episode 24 - Love Potion #9
    7.9/10(228 votes)

    S1:E24

    With the school dance coming up, Emma and Cleo hope Byron and Lewis will ask them out. Meanwhile, Miss Chatham and Lewis argue about which has more merit – magic or science.

    Director:Jeffrey Walker
    Writer:Unknown

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  18. H2O: Just Add Water Season 2 Episode 13 - Moonwalker
    7.9/10(196 votes)

    S2:E13

    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 are affected by the moon, they are unable to stop the curious Charlotte...

    Director:Unknown
    Writer:Unknown

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  19. H2O: Just Add Water Season 2 Episode 20 - The Gracie Code (2)
    7.9/10(193 votes)

    S2:E20

    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"

    Director:Unknown
    Writer:Unknown

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  20. H2O: Just Add Water Season 3 Episode 1 - The Awakening
    7.9/10(216 votes)

    S3:E1

    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 encounter a new force on Mako Island that has the power to turn water against the girls.

    Director:Jeffrey Walker
    Writer:Unknown

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  21. H2O: Just Add Water Season 1 Episode 17 - Under the Weather
    7.8/10(248 votes)

    S1:E17

    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.

    Director:Jeffrey Walker
    Writer:Unknown

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  22. H2O: Just Add Water Season 1 Episode 20 - Hook, Line and Sinker
    7.8/10(241 votes)

    S1:E20

    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.

    Director:Jeffrey Walker
    Writer:Unknown

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  23. H2O: Just Add Water Season 2 Episode 16 - Double Trouble
    7.8/10(204 votes)

    S2:E16

    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, Emma thinks something is up between Ash and Rikki.

    Director:Unknown
    Writer:Unknown

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  24. H2O: Just Add Water Season 2 Episode 21 - And Then There Were Four
    7.8/10(189 votes)

    S2:E21

    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.

    Director:Unknown
    Writer:Unknown

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  25. H2O: Just Add Water Season 3 Episode 10 - Revealed
    7.8/10(169 votes)

    S3:E10

    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.

    Director:Jeffrey Walker
    Writer:Unknown

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Best Episodes Summary

"Unfathomable" is the best rated episode of "H2O: Just Add Water". It scored 8.6/10 based on 257 votes. Directed by Unknown and written by Unknown, it aired on 3/21/2008. This episode scored 0.1 points higher than the second highest rated, "Wrong Side of the Tracks".