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H2O: Just Add Water 

Three girls become mermaids after a mysterious island transforms them and gives them special powers.
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Series cast summary:
Cariba Heine ...  Rikki 78 episodes, 2006-2010
Phoebe Tonkin ...  Cleo 78 episodes, 2006-2010
Angus McLaren ...  Lewis 66 episodes, 2006-2010
Burgess Abernethy ...  Zane 53 episodes, 2006-2010
Claire Holt ...  Emma 52 episodes, 2006-2008
Alan David Lee ...  Don Sertori / ... 51 episodes, 2006-2010
Cleo Massey ...  Kim / ... 40 episodes, 2006-2010
Jamie Timony ...  Nate 36 episodes, 2006-2010


Three ordinary women discover a moon pool on Mako Island that turns them into extraordinary mermaids with special powers over water on the night of a full moon. They must never look in the moon's eye or there will be side effects for each of them.

Plot Summary | Add Synopsis


Do you believe in mermaids?


TV-PG | See all certifications »

Parents Guide:

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Release Date:

7 July 2006 (USA) See more »

Also Known As:

H2o See more »


Box Office


AUD 10,000,000 (estimated)
See more on IMDbPro »

Company Credits

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Technical Specs

Sound Mix:

Stereo | Dolby Digital



Aspect Ratio:

1.78 : 1
See full technical specs »

Did You Know?


Claire Holt (Emma Gilbert) auditioned for a part in The Secret Circle (2011) but didn't get it. Phoebe Tonkin (Cleo Sertori) landed the part of Faye Chamberlain on the show. See more »


Many times throughout the series, characters are shown using snorkels while diving, supposedly allowing them to breathe underwater. This is possible only if one stays at the surface to allow the snorkel to stick out of the water, and this is not how they are used in the show. See more »


Rikki Chadwick: I never liked pool parties anyway.
See more »


Referenced in Mako Mermaids: Homecoming (2016) See more »


Somebody Out There
by Kate Alexa
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Frequently Asked Questions

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User Reviews

Just Plain Fun
30 October 2007 | by dragon-nibblerSee all my reviews

One of my friends recommended this show to me, and once I saw the first episode, I didn't really know what to think.

The story starts off with Cleo being the main focus, and jumping right into her life, with her friends, enemies and family.

Who are the people she is talking to? The story starts off slow, and if you are only planning on seeing the first episode, steer away right now. The characters' backgrounds and personalities are built up over the first few episodes, along with how they can cope with what is happening to them, but you have to stick with it or it won't make any sense.

Cleo is talking to this girl who is swimming, Emma. Emma is an important character int he story, as without her I am sure Cleo and Rikki would have been goners from the start.

So, we meet Rikki, who stole something off someone's boat (Note to self : watch my wallet around her), and valiantly jumps into the boat she stole the item from, which Cleo is now in. Now, my first impression of Rikki: Loud mouthed and cheeky. It turns out I wasn't that far off, but, in the end, it makes the show all the better. The 3 girls' personalities even out over the episodes.

And well, we have the main characters: Emma, the cautious one, Rikki, the one in-your-face one, and Cleo, the . . . I am not really sure how to describe her. Off the top of my head I would say 'annoying', but I think there are depths to her personality that I keep overlooking.

Then there is Lewis. Having known Cleo for who knows how long, he is seen often, as more of a comic relief character who thinks he is a scientist, and is usually, if not asking the girls for hair samples, trying to figure out what is up with them.

All in all, I would say this is a great, fun show. The plot is, in fact, thicker than I would have thought possible from watching the first episode (So stick to it!). It has a great assortment of characters (though, I do think a few skip between in and out of character), and plot twists when you least expect it (or think nothing else can go wrong for the three). So, I give this show 8/10 rating, for a great plot, good humor, and episodes that you want to see at least twice.

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