Enjoy high-seas thrills as Barbie, Chelsea, and the rest of the Roberts family set sail on an adventure cruise. Chelsea is particularly excited because she gets to spend her seventh birthday on the awesome ship. But when they cross the International Date Line, Chelsea discovers her actual birthday has been lost! In order to save her birthday, Chelsea gets off the boat and embarks on a fantastical journey through an enchanted jungle island where she meets three new talking animal friends who happen to sound just like her sisters. Together, Chelsea and the animals overcome unexpected challenges and discover that being little can actually be big fun!