Dora and her friends transform into mermaids in order to defeat the meanest mermaid in the ocean, la Sirena Mala, from taking everyone's treasure.Dive into a majestic mermaid world with Dora! In this swimsational limited-time theatrical movie event, Dora and Boots turn into mermaids and go on a series of mer-mazing underwater adventures with their new friend, Marisol the Mermaid and her dolphin bestie Rosa! Plus, in a bonus adventure, celebrate Dora’s birthday!