Series about Potto and Hilda, who live in their magical question tree with the Bookworms and the Weatherberries. They are joined by their friends Claribelle and Archie. In this episode, Archie worries that his glasses mean that he can never become a superhero - Potto helps him realise that he's wrong, and 'Supersquirrel, master of shapes and numbers' makes his first appearance in the tree.