Who's afraid of the big bad Wolf? Not Jason Shepherd (Frankie Muniz), who has to prove that a sleazy Hollywood producer Marty Wolf (Paul Giamatti) stole his class paper and turned into a blockbuster hit movie called Big Fat Liar. Traveling to Los Angeles with his best friend Kaylee (Amanda Bynes), Jason tries to break into show business - literally. Through a hilarious series of pranks and ruses, Jason brings one of Hollywood's most powerful producer to his knees.