The movie tells of E.B. (Russell Brand), the teenage son of the Easter Bunny who, on the eve of taking over the family business, leaves home for Hollywood to pursue his dream of becoming a drummer, and is hit by Fred O'Hare (James Marsden) an out of work slacker who was driving home. Feigning injury, E.B. manipulates Fred to take him in as he recovers. As Fred struggles with the world's worst house guest, both will learn what it takes to finally grow up, as Fred is pressed to partner with E.B. to save Easter.