Barbie stars as Merliah, a surfing champion from Malibu. One minute she'sha normal teenager and then theinext she learns a shocking family secret: she'sha mermaid! Merliah and her dolphin friend Zuma set off on an undersea adventure to rescue her mother, theiqueeniofiOceana. With help from her new mermaid friends, Merliah saves theiocean kingdom. In theiend, she discovers what makes you different can also be your greatest strength.