Barbie Dreamhouse Adventures Season 4 Episode 1 Magical Mermaid Mystery Part 1 Episode Title: Magical Mermaid Mystery Part 1 Episode Description: George decides to take the family on holiday to Costa Rica where he will be filming a whale documentary, while Barbie and friends land summer jobs at a water park in Malibu. When Barbie learns of the trip, she tries desperately to take a holiday from work to go with her family. Unfortunately, she is not able to pick up the courage in time to ask her super cool boss, Darcy. Meanwhile, Trey decides to throw a party at the Dreamhouse, while Barbie is at work. Everything goes haywire when the Roberts' pets are left alone at home.