S2, E16: Seth is determined to bring back the spirit and fun times of last year and won't stop until his plan is successful. Alex's (recurring guest star OLIVIA WILDE) jealousy is fueled when Marissa enlists an unlikely partner to help her with the school bonfire. Meanwhile, Kirsten wants Carter (recurring guest star BILLY CAMPBELL) to continue with the magazine despite his reservations, and Sandy helps Julie keep her blackmailer at bay.