When an uncharted island springs up in Gotham City Harbor, Batman and Mystery Inc. join forces to uncover who created the tropical paradise. Before long, they find themselves under attack by a host of vile vegetation and prehistoric plants. Can the Dark Knight help Scooby and the gang escape from this mysterious island before they become a feast for the ferocious foliage? Find out in this action-packed chapter book for fans of Batman and Scooby-Doo!