Barbie "Malibu" Roberts and Barbie "Brooklyn" Roberts discover a mysterious baby Pegasus on the beach in Malibu and work to find out where the magical horse came from. While they try to find out how to get little Peggy home, Malibu and Brooklyn, with the help of Malibu's sisters and best friend Ken, have to protect their four-legged friend from a Glyph, the fantastical creature that followed Peggy in hopes of stealing the little horse's wings.