Cast of Big Fat Liar

Frankie Muniz plays Jason Shepherd, a young boy who struggles with getting his school assignment completed and ends up in a tricky situation.

Paul Giamatti portrays Marty Wolf, a dishonest Hollywood producer who steals Jason's story.

Amanda Bynes plays Kaylee, Jason's friend who helps him confront Marty Wolf.

Amanda Detmer is Monty Kirkham, a character who assists Marty in his schemes.

Sandra Oh plays Mrs. Caldwell, a teacher who encourages Jason in his academic pursuits.

Russell Hornsby portrays Marcus Duncan, a character involved in the conflict surrounding Jason's story.

Michael Bryan French plays Harry Shepherd, Jason's supportive father.

Christine Tucci plays Carol Shepherd, Jason's mother who is concerned about her son.

Lee Majors portrays Vince, an influential figure in the film's plot.

Donald Faison plays Frank Jackson, a character who helps in the comedic chaos of the story.

Sean O'Bryan plays Leo, a character associated with the film's central conflict.

Amy Hill portrays Joscelyn Davis, adding to the ensemble in this comedic adventure.