H2O: Emma, Cleo and Rikki are sixteen year old girls growing up on the sun-drenched beaches of the Gold Coast in Australia. The girls find themselves stranded at sea one day, floating towards the mysterious Mako Island. The three girls find themselves exploring the eerie jungle-covered island before becoming trapped in an ancient cavern under a volcano. Discovering an underwater channel, they decide to swim to safety. As they enter the pool, the light from a full moon illuminates the water, creating a mysterious glow. Emma, Cleo and Rikki get off the island as fast as they can and back to "normal" life. One by one, however, the girls discover life is never going to be normal again; ten seconds after they touch water, they turn into mermaids. After further experimentation, they find they have supernatural powers; Emma can freeze water, Rikki can boil water and Cleo can turn a drop of water into a bucketful and mold it into any shape. But in Season Two their powers take on a new twist and Cleo can create wind Emma make blizzards and Rikki create fire. They also have more problems to take care of such as Charlotte. The newborn mermaids must now avoid all water, for fear of discovery. Only their friend Lewis knows their secret, and together they enjoy their newfound powers, the wonders of the ocean, and evade marine biologists and the local bad-boy turned mermaid hunter, Zane.