This week we have Jack back to being his usual skeptical self. While Molly attends a class reunion at Hope Springs High Jack and Annie are trapped in a sadistic, never-ending detention with cranky ol' Ms. Mitchell. Despite the fact that Annie believes that the two of them have time-travelled back to 1974 Jack, in typical Jack-fashion, tries to chalk it all up to a probable concussion. When this explanation fails to hold water, Jack then concludes that it must all be an elaborate hoax perpetrated by a rather deranged science teacher.