H2O: Mermaid Adventures (2015)

Emma, Cleo, and Rikki's ordinary teenage lives take an extraordinary turn when they stumble upon a mystical, off-limits island. There, they are bestowed with the incredible ability to transform into mermaids, unlocking a world filled with adventure and challenges. As they navigate their new aquatic powers, the trio must also juggle the complexities of adolescence, friendships, and the secrets that come with their enchanting transformation. Each episode reveals the wonders and perils of their mermaid existence, making for a captivating blend of fantasy and coming-of-age storytelling.