Delight in high-sea thrills as Barbie, Chelsea et cetera of the Roberts family members set out on an experience cruise. "Barbie & Chelsea The Lost Birthday" informs the tale of Chelsea, Barbie's bright youngest sister, et cetera of the Roberts household as they dive in on a journey cruise ship for her 7th birthday. When they cross the International Date Line, Chelsea discovers her real birthday celebration has been lost as well as she starts a sensational trip with an enchanted jungle island in order to save it.