Barbie regresa como Merliah, la divertida y elegante campeona de surf que además es una princesa sirena. Merliah da el golpe cuando se dirige a Australia para la competición de surf definitiva. Pero cuando la malvada sirena Eris escapa de su prisión y planea hacerse con el trono de Oceana, Merliah y sus amigos marítimos se apresuran a detenerla. Se trata de una nueva aventura en la que Merliah aprenderá que todo es posible cuando te mantienes fiel a tí misma.

Surf's up for Barbie as she returns as Merliah, the fun and fashionable surfing champion who's also a magical mermaid princess! In this exciting sea-quel, Merliah makes a splash when she heads to Australia for the ultimate surfing competition. When the evil mermaid Eris escapes from her whirlpool with plans to take over the throne of Oceana, Merliah and her sea friends dive in to stop her. It's a fresh new adventure where Merliah learns that anything is possible and she really can have the best of both worlds!