Serena Worthington is Erin's arch enemy. Serena is always teasing and making fun of Erin. It is Serena who starts calling Serena a puppet and Jillian the puppeteer. She is also the one responsible for having the Pinocchio posters of Erin up around school. By the end, the girls realize that they have more in common than they thought, belong to the Intranet Club together and become friends.
