Surf's up for Barbie as she returns as Merliah, the fun and fashionable surfing champion who is also a magic mermaid princess! Within this, Merliah creates a splash when she heads to Australia for the surfing contest. When the evil mermaid Eris escapes to dominate the throne of Oceana, Merliah and her sea friends dive in to prevent her. It's a new experience where Merliah discovers that anything is possible and also she really might get the best of both worlds!