Barbie's parents and sisters go on a Costa Rican holiday, while Barbie, Daisy, Teresa, Renee and Nikki get hired to work at a water park.
| Actor | Role |
|---|---|
 America YoungBarbie (voice) | Barbie (voice) |
 Cassidy NaberChelsea (voice) | Chelsea (voice) |
 Cassandra Lee MorrisStacie (voice) | Stacie (voice) |
 Kirsten DaySkipper (voice) | Skipper (voice) |
 Ritesh RajanKen (voice) | Ken (voice) |
| EEmma GalvinDaisy (voice) | Daisy (voice) |
 Desirae WhitfieldNikki (voice) | Nikki (voice) |
 Cristina MiliziaTeresa (voice) | Teresa (voice) |
 Stephanie ShehRenee (voice) | Renee (voice) |