H2O: Just Add Water, also known as H2O, is an Australian television programme 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's premise revolves around three teenage girls facing everyday teen problems with an added twist: they're mermaids with powers over water. The theme song "No Ordinary Girl" is performed by Ellie Henderson in series one, by Kate Alexa in series two and by Indiana Evans in series three.