<Tr> <Th> Website </Th> <Td> www.h2ojustaddwater.com.au </Td> </Tr> <P> H O: Just Add Water, also known as H O, is an Australian dramatic fantasy 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 revolves around three teenage girls facing everyday teen problems with an added twist: they're mermaids with powers over water . </P> <P> 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 . </P> <P> 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 overhead, 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 . </P>

When did h2o just add water come out