In "Barbie & Chelsea: The Lost Birthday (2021)," viewers are taken on a delightful adventure alongside the iconic Barbie and her younger sister Chelsea. The film follows Chelsea, who is eagerly looking forward to celebrating her birthday with family and friends. However, an unexpected turn of events leads to Chelsea's birthday party decorations going missing, setting the stage for a heartwarming journey filled with mystery, friendship, and teamwork. As Barbie and Chelsea set out to unravel the mystery behind the lost decorations, the movie explores themes of resilience, the importance of family bonds, and the power of teamwork. The overall vibe of the film is one of whimsy, excitement, and the joy of discovery, making it a perfect watch for audiences of all ages. Join Barbie and Chelsea as they embark on a thrilling quest to find the missing birthday decorations, learning valuable lessons along the way in this charming and enchanting tale.