Barbie in A Mermaid Tale (2010)

Merliah, a talented surfer, discovers an astonishing truth about her origins—she's a mermaid! With her loyal dolphin companion by her side, she dives into an enchanting underwater world. Together, they embark on a thrilling quest to save her mother, the queen of Oceana, from impending danger. As they navigate the vibrant depths of the ocean, Merliah must embrace her true identity and harness her newfound abilities to confront challenges and reclaim her rightful place in the underwater kingdom.