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Season guide

H2O: Just Add Water: Season 2

26 episodes Premiered Sep 28, 2007 Updated Sep 30, 2026
Previously on H2O: Just Add Water

Season 2 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • ⚡ Picks up essential narrative continuity directly following the events of H2O: Just Add Water Season 1.
  • ⚡ Character alliances, factions, and personal loyalties undergo significant shifts under escalating stakes.
  • ⚡ Addresses unresolved cliffhangers and thematic mysteries introduced during previous seasons.
  • ⚡ Establishes the primary seasonal conflict that drives serialized character arcs toward the finale.
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Season 2 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 2 Progress Shield

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Binge Efficiency Engine

Season 2: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

15%
85%
Mytharc (4): Crucial lore & season climaxes
Core (22): Character development & subplots
Side Quest (0): Standalone / filler
S2·E1 Mytharc

Stormy Weather

Sep 28, 2007 · 24 min

The girls catch a glimpse of the full moon and Lewis tries to keep them grounded. Drawn back to Mako Island during a rare planetary alignment, they experience unpredictable shifts

S2·E2 Core

Control

Oct 5, 2007 · 24 min

The girls have problems with their new powers and Cleo finds that Lewis isn't helping. A new girl called Charlotte arrives and hits it off with a certain someone.

S2·E3 Core

The One That Got Away

Oct 12, 2007 · 24 min

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 s

S2·E4 Core

Fire and Ice

Oct 19, 2007 · 24 min

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 is receiving cards from a secret admirer.

S2·E5 Core

Hocus Pocus

Oct 26, 2007 · 24 min

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 book of mermaid spells, the girls attempt to use a potion

S2·E6 Core

Pressure Cooker

Nov 2, 2007 · 24 min

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! Meanwhile, Rikki and Emma attempt to save

S2·E7 Core

In Hot Water

Nov 9, 2007 · 24 min

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 back at him but end up going too far

S2·E8 Core

Wrong Side of the Tracks

Nov 16, 2007 · 24 min

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.

S2·E9 Mytharc

Riding for a Fall

Nov 23, 2007 · 24 min

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 Charlotte and Cleo.

S2·E10 Core

Missed the Boat

Nov 30, 2007 · 24 min

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 Mako Island with the help of Lewis.

S2·E11 Core

In Over Our Heads

Dec 7, 2007 · 24 min

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!

S2·E12 Core

Fish Fever

Dec 14, 2007 · 24 min

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 trying to break her and Lewis apar

S2·E13 Core

Moonwalker

Dec 21, 2007 · 24 min

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

S2·E14 Core

Get Off My Tail

Dec 28, 2007 · 24 min

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.

S2·E15 Core

Irresistable

Jan 4, 2008 · 24 min

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 ends up wearing it and Emma, Cleo and Rikki all fall

S2·E16 Core

Double Trouble

Jan 11, 2008 · 24 min

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 As

S2·E17 Core

Moonstruck

Jan 18, 2008 · 24 min

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

S2·E18 Core

The Heat Is On

Jan 25, 2008 · 24 min

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 c

S2·E19 Core

The Gracie Code (1)

Feb 1, 2008 · 24 min

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 orde

S2·E20 Core

The Gracie Code (2)

Feb 8, 2008 · 24 min

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

S2·E21 Core

And Then There Were Four

Feb 15, 2008 · 24 min

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

S2·E22 Core

Bubble Bubble, Toil and Trouble

Feb 22, 2008 · 24 min

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.

S2·E23 Core

Reckless

Feb 29, 2008 · 24 min

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 er own hands when Nate causes troub

S2·E24 Core

Three's Company

Mar 7, 2008 · 24 min

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

S2·E25 Mytharc

Sea Change

Mar 14, 2008 · 24 min

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.

S2·E26 Mytharc

Unfathomable

Mar 21, 2008 · 24 min

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

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