Barbie's younger sister Chelsea is trying to celebrate her 7th birthday but her birthday is skipped due to the international date line.

Excited about celebrating her 7th birthday, Chelsea embarks on a fascinating cruise adventure along with Barbie and the rest of the Roberts family. However, after crossing the International Date Line, Chelsea realises that they skipped an entire day instead of gaining one hour. Now, to save the day, the girls visit an enchanted nearby island, where beautiful surprises, new friends, and exciting experiences await them. But can they save the lost birthday?—Nick Riganas

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 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.