Big Fat Liar is a 2002 American teen comedy film directed by Shawn Levy, written and produced by Dan Schneider and Brian Robbins, and starring Frankie Muniz, Paul Giamatti, and Amanda Bynes. The film involves a 14-year-old pathological liar named Jason Shepherd (Muniz), whose creative writing assignment is stolen by an arrogant Hollywood producer named Marty Wolf (Giamatti), who plans to use it to make the fictional film of the same name.