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Promo poster starring Cariba Heine as Rikki and Zayne Emory as Nash.

The fourth season of the Australian television series H2O: Just Add Water, commenced airing in on July 4, 2016 and will consist of 26 episodes. The season continues the story of Cleo, Rikki and Bella, with the return of long-gone Emma and the addition of a new member.


As Emma returns she come across problems with Bella - feeling replaced. Cleo and Lewis work their long-distance relationship, and Rikki falls for the new guy, Nash, who turn out to be just like them, yet has to fight over him with another girl.


Main cast

  • Phoebe Tonkin as Cleo Sertori
  • Cariba Heine as Rikki Chadwick
  • Claire Holt as Emma Gilbert
  • Indiana Evans as Isabella "Bella" Hartley
  • Luke Mitchell as Will Benjamin
  • Zayne Emory as Nash McLaren
  • Angus McLaren as Lewis McCartney
  • Burgess Abernethy as Zane Bennett
  • Taryn Marler as Sophie Benjamin
  • Gemma Forsyth as Evie McLaren
  • Ariana Grande as Evelyn Lopez
  • Peter Hermann as Mr. Hartley
  • Jason Dolley as Jason Hartley
  • Isla Fisher as Ava Watsford-Hartley

    Main cast merpeople. From left to right Emma (Claire Holt), Rikki (Cariba Heine), Cleo (Phoebe Tonkin), Bella (Indiana Evans) and Nash (Zayne Emory).


S04 OST.png
  1. "What's My Name" performed by Indiana Evans
  2. "Die Trying" performed by Indiana Evans & Zayne Emory
  3. "Bad Girls" performed by Zayne Emory
  4. "Desire" performed by Indiana Evans
  5. "New York" performed by Zayne Emory
  6. "Put It On Me" performed by Indiana Evans & Zayne Emory
  7. "What the Hell is Wrong with Me" performed by Indiana Evans
  8. "Fucked Up Me" performed by Indiana Evans & Zayne Emory
  9. "Complicated" performed by Zayne Emory
  10. "No Ordinary Girl" performed by Indiana Evans
  11. "I Just Wanna Be" performed by Zayne Emory

H2O- Just Add Water - Season 4 Opening