Queen Banana Marinette's class is filming a superhero movie, with Zoé in the leading role. Chloé, jealous of her half-sister's casting, tries to take over the film, wanting it to cast herself as "Queen Banana", to have her own banana-themed car, and to have a giant gorilla supervillain that shoots exploding bananas. When her class refuses to comply with her demands, she is akumatized and amokized into an actual "Queen Banana", complete with a car and a gorilla sentimonster named "Banana Boom-Boom", all of which can turn people into bananas. To defeat her, Ladybug gives Zoé the Bee Miraculous, transforming her into the superheroine "Vesperia".