kids encyclopedia robot

H2O: Just Add Water facts for kids

Kids Encyclopedia Facts
H2O: Just Add Water
H2O Just Add Water.png
Created by Jonathan M. Shiff
Directed by
  • Colin Budds
  • Jeffrey Walker
Theme music composer Shelley Rosenberg
Opening theme
  • "No Ordinary Girl"
  • - Ellie Henderson (series 1)
  • - Kate Alexa (series 2)
  • - Indiana Evans (series 3)
Ending theme "No Ordinary Girl"
  • Ricky Edwards
  • Ric Formosa
Country of origin Australia
Original language(s) English
No. of series 3
No. of episodes 78 (list of episodes)
Executive producer(s)
  • Jonathan M. Shiff
  • Kay Ben M'Rad (series 1)
  • Julia Adams (series 2–3)
  • Jonathan M. Shiff
  • Joanna Werner
  • Bruce Phillips (series 1)
  • Zenon Sawko (series 2–3)
  • Geoff Lamb
  • Strutts Psyridis
  • Philip Watts
Camera setup Single-camera
Running time 23–25 minutes
Production company(s) Jonathan M. Shiff Productions
Original network Network Ten
Picture format PAL (576i); HDTV (720p/1080i)
Audio format Surround sound
Original release 7 July 2006 (2006-07-07) – 16 April 2010 (2010-04-16)
Related shows

H2O: Just Add Water, also known as H2O, is an Australian dramatic fantasy television series for children and teenagers created by Jonathan M. Shiff. It first screened on Australia's Network Ten and runs in syndication on channels in over 120 countries and has a worldwide audience of more than 250 million. It was filmed on location at Sea World and other locations on the Gold Coast. The show revolves around three teenage girls facing everyday teen problems with an added twist: they are mermaids with powers over water.

Only two series with a total of 52 episodes were originally planned, but due to popular demand, a third series was filmed. Series one premiered in July 2006, followed by series two in September 2007. Series three first aired in the United Kingdom in October 2009, with the Australian premiere occurring in May 2010.


Rikki Chadwick, Emma Gilbert, and Cleo Sertori are three teenage Australian girls who find themselves stranded on the mysterious Mako Island, where they end up in a pool under a dormant volcano just as a full moon passes above them, bathing the pool in light. The girls are rescued and brought back to shore, where they return to their normal lives, until discovering their lives have become anything but normal. The girls find out that ten seconds after coming into contact with water they transform into mermaids. After further experimentation, the girls also discover they have supernatural powers over water. The trio enlist the help of Cleo's friend Lewis McCartney to help them keep their secret.

Everyday situations, such as bathing and dealing with rainy weather, become tricky as the girls struggle with their newfound abilities, which come with many advantages and disadvantages, while also trying to keep them a secret from everyone else, including their families. They soon adapt to their new abilities and lifestyles.

Series two introduces Charlotte Watsford, a rival to Cleo, for dating Lewis shortly after Cleo had broken up with him. She gains mermaid powers and becomes the main antagonist of series two. She has all three of the mermaids' powers. In the end, Charlotte loses both her powers and Lewis.

Series three sees the departure of Emma, who has left to travel the world with her parents. A new character, Bella Hartley, is introduced and it is discovered that she has been a mermaid since the age of nine. Rikki and Cleo become friends with Bella, but are soon beset by a mysterious tentacle of water with a connection to Mako Island. A new boy, Will Benjamin, also arrives and becomes friends with the trio when he discovers that they are mermaids. The girls learn that Earth is in the path of a comet that could destroy the planet. Using their powers, they manage to stop the comet from colliding with Earth.



  • Cariba Heine as Rikki, the new girl in town at the start of the show, who tends to be aloof and rebellious. Her power is the ability to control heat in water, ranging from warming to boiling, which eventually grows to allow her to control fire and lightning. Heine appears in all series of the show, and makes a special guest appearance in the spin-off series Mako: Island of Secrets.
  • Claire Holt as Emma (series 1–2), who has a confident and responsible, if somewhat controlling, personality. She has the ability to freeze water, and later develops the ability to control clouds, ice and snow. Holt appears in series one and two, but left the show at the end of series two to film Messengers 2: The Scarecrow, with the character's departure explained as travelling the world with her family.
  • Phoebe Tonkin as Cleo, who at first is shy and a little awkward and does not like water, but eventually becomes outgoing and personable. She is able to control and mould the form of water, as well as increase or decrease the amount of water present. She is later able to control the wind. Tonkin appears in all series of the show.
  • Angus McLaren as Lewis, Cleo's childhood friend and later boyfriend who is academically gifted and thinks of himself as a scientist. He helps the girls keep their secret and works to understand how and why the girls transformed into mermaids. After appearing in both series one and two, McLaren left the show during the third series to begin filming Packed to the Rafters, but guest starred in the final episode of the show.
  • Indiana Evans as Bella (series 3), the new girl in series three. She is a singer and performs at Rikki's cafe. Bella became a mermaid in the sea caves of Ireland when she was nine, and has the power to change water into gelatine and a crystalline substance. During the series, she and Will develop feelings for each other, and eventually become a couple.
  • Luke Mitchell as Will (series 3), a skilled swimmer and free-diver who is introduced in series three. While exploring Mako Island, he finds the moon pool and is attacked by the water, causing him to search for the cause of the strange event. He is Bella's love interest and becomes closer to the girls once he discovers they are mermaids.


  • Burgess Abernethy as Zane, who is the arrogant local rich boy. In series one, he becomes obsessed with discovering the identity of the mermaids after catching a glimpse of one. He later develops an on-again, off-again relationship with Rikki. At the end of series one, when he finds out she, Emma and Cleo are mermaids, he stops his obsessive behaviour to protect Rikki. In series three, he transforms the Juice Net cafe and goes into a business partnership with Rikki, naming the cafe after her.
  • Cleo Massey as Kim, Cleo's younger sister.
  • Alan David Lee as Don Sertori, Cleo and Kim's father.
  • Trent Sullivan as Elliot (series 1–2), Emma's younger brother.
  • Jamie Timony as Nate, one of Zane's friends.
  • Brittany Byrnes as Charlotte (series 2), the new girl who becomes the main antagonist of series two. She enjoys the arts and sciences, but can be controlling and manipulative. She comes into conflict with the girls, especially Cleo, when she begins to date Lewis subsequent to his break-up with Cleo. Upon transforming into a mermaid, she obtains all of the girls' collective powers - clarified as being due to the fact that she was exposed to the transformation conditions on her own rather than the original three being present at the same time. She permanently loses her abilities after a confrontation with the trio. She does not return in series three.
  • Craig Horner as Ash (series 2), a keen equestrian and riding coach who appears during series two. He forms a relationship with Emma, but does not learn of her being a mermaid until the season finale, when Emma reveals her identity. Horner does not appear in series three due to filming Legend of the Seeker.
  • Penni Gray as Sam (series 3), who works for the National Park association. In "Valentine's Day", she inspects one of Don's boats, but is drawn into an argument between Kim and Cleo when she is knocked overboard of that boat. Eventually, she and Don start getting romantically closer, which Cleo approves but Kim does not. They get married in "To Have & To Hold Back".
  • Taryn Marler as Sophie (series 3), an ambitious and driven character who becomes the main antagonist of series three. She is Will's older sister and takes an immediate dislike to Bella because Sophie sees her as a threat to Will's success as a free diver. She becomes a manager in Rikki's cafe and does as much as possible to cause grief for the mermaids, including destroying Zane and Rikki's relationship. She also tries to get her brother Will to go against Bella by saying she is a distraction.


List of H2O: Just Add Water episodes



An official soundtrack for series two of the show, titled ' and recorded by singer Kate Alexa, was first released on 10 September 2007 in Australia on Liberation Records and has since been made available worldwide. Its lead track, "No Ordinary Girl", is the theme song for the show. "No Ordinary Girl" is performed by Ellie Henderson in series one, by Kate Alexa in series two and by Indiana Evans in series three.

A second soundtrack, featuring music from series three, was first released on iTunes on 17 February 2011 and later worldwide in March 2011. It is also titled ' and was recorded by actress Indiana Evans.


Several children's books have been released by Nickelodeon UK:

  1. No Ordinary Girl – 2 February 2009
  2. Living with Secrets – 2 February 2009
  3. Fishy Business – 5 May 2009
  4. A Sleepover Tail – 6 July 2009
  5. Sequins for Sea Queens – 7 January 2010
  6. First Crush – 29 April 2010
  7. Moonspell – 5 August 2010
  8. Testing Times – 6 January 2011
  9. Hot Stuff – 9 June 2011
  10. In Too Deep – 4 August 2011
  11. Mermaid Emotions – 27 October 2011
  12. Siren Status – 2 February 2012

Awards and nominations

Year Award Category Nominee Result
2007 Nickelodeon Australian Kids' Choice Awards Best TV Show H2O: Just Add Water Nominated
Logie Awards Most Outstanding Children's Program H2O: Just Add Water Nominated
2008 AFI Awards Best Visual Effects H2O: Just Add Water Won
Best Children's Television Drama H2O: Just Add Water Nominated
Best Lead Actress in a Television Drama Phoebe Tonkin Nominated
Best Guest or Supporting Actress in a Television Drama Brittany Byrnes Nominated
Logie Awards Most Outstanding Children's Program H2O: Just Add Water Nominated
Nickelodeon Australian Kids' Choice Awards Best TV Drama Show H2O: Just Add Water Won
2009 Nickelodeon Australian Kids' Choice Awards Best Drama Show H2O: Just Add Water Nominated
Logie Awards Most Outstanding Children's Program H2O: Just Add Water Won
2011 AACTA Awards Best Children's Television Series H2O: Just Add Water Nominated


In July 2011, the production of a 26-episode spin-off was announced. The new series, Mako: Island of Secrets, follows the adventures of 15-year-old Zac and mermaids Sirena, Nixie, and Lyla. In the final series of the show, Cariba Heine makes a guest appearance as Rikki.

In May 2015, an animated spin-off targeted to children premiered on Netflix, titled '.