"H2O: Just Add Water" is an Australian television series that aired from 2006 to 2010. The show follows the lives of three teenage girls—Cleo Sertori, Emma Gilbert, and Rikki Chadwick—who gain the ability to turn into mermaids when they come into contact with water. Each girl has unique powers related to water, which they must learn to control while navigating the challenges of adolescence. The series explores themes of friendship, identity, and the consequences of keeping secrets. As the girls balance their normal lives with their mermaid abilities, they encounter various adventures and conflicts, including interactions with Zane Bennett, a boy who becomes involved in their secret world.