Barbie is a cosmic princess who flies high on her hoverboard through a far-off universe with her adorable and devoted pet sidekick, Pupcorn. One day, everything changes when the twinkling stars start to dim and slow their dance in the sky. Barbie travels to a beautiful new planet to join a special rescue team on a mission to save the stars. Once there, she teams up with a group of talented new friends who work together to save the galaxy through exciting hoverboarding adventures. Barbie soon discovers that if she listens to her heart, and with the help of her friends, she might be the leader the whole universe has been waiting for!

Barbie and her sisters, Skipper, Stacie and Chelsea, and their adorable new puppy friends find unexpected mystery and adventure when they return to their hometown of Willows. While going through mementos in Grandma's attic, the sisters discover an old map, believed to lead to a long-lost treasure buried somewhere in the town. With their puppy pals in tow, the four girls go on an exciting treasure hunt, along the way discovering that the greatest treasure of all is the love and laughter they share as sisters!