Barbie portrays Merliah, a mermaid princess/surfing champion in Barbie In a Mermaid Tale 2, the computer-animated sequel to Barbie In a Mermaid Tale. Kelly Sheridan voices the iconic Barbie.
Merliah is off to Australia for a surfing competition, but gets sidetracked when her cherished necklace is stolen by her rival, Kylie Morgan. The theft leads to the escape of Eris, an evil mermaid who lives in a deep-sea whirlpool and has designs on supplanting Merliah's spot on the Throne of Aquellia, the ultimate Mermaid Council. Merliah and her underwater friends set off to stop Eris and reclaim the necklace, although they are opposed at every turn.
14-year old Kiana Brown performs the theme song, "Do the Mermaid," after winning a national talent search competition.