Barbie returns in Mermaid Tale 2 as the beautiful surfing mermaid, Merliah Summers. Merliah is going to Australia for the ultimate surfing competition with her friends both human and sea. Things are looking up for Merliah until the evil mermaid Eris returns to try and take over the throne again. Its up to Merliah to stop Eris and save the beautiful mer-world of Oceana. As Merliah races the clock to save her mothers kingdom and finish the big surfing competition Merliah learns anything is possible and that her love for both worlds land and sea are what brings out the best. Kelly Sheridan is back as the voice of the beautiful surfing Princess Merliah Summers.

Barbie stars as Merliah, a surfer who learns a shocking secret: she's a mermaid! She and her dolphin friend set out for an undersea adventure to rescue her mother, the queen of Oceana. Merliah Summers is an avid surfer in Malibu. While participating in a surfing competition, Merliah loses concentration when her hair spontaneously streaks pink, and wipes out. While underwater, she discovers that she can breathe in water, and is approached by pink-purple dolphin named Zuma, who wants to talk to her. Merliah tells Break, her grandfather, of the incident. Break explains that Merliah's mother is a mermaid, and that Merliah was given to Break as a baby to raise because she was born with legs. Merliah doesn't believe him and goes to her friends Fallon and Hadley, telling them the story...