When a boy and his uncle witness the killing of a dolphin's family, they take care of the marine mammal, and he helps them track an illegal toxic waste dumper.

The kids are thrilled that Bernie's come back! But so has their old enemy Winston, who's about to kidnap the talented dolphin. Can Kevin and Holly rescue their splashy friend before its too late?

Barbie stars as Merliah, a surfing champion from Malibu. One minute she's a normal teenager and the next she learns a shocking family secret: she's a mermaid. Merliah and her dolphin friend Zuma set off on an undersea adventure to rescue her mother, the queen of Oceana. With help from her new mermaid friends, Merliah saves the ocean kingdom. In the end, she discovers what makes you different can also be your greatest strength.