Who's afraid of the big bad Wolf? Not Jason Shepherd. This 14-year-old thinks on his feet and when he has to prove that sleazy Hollywood producer Marty Wolf stole his class paper and is turning it into the blockbuster movie "Big Fat Liar", he is ready for battle. Traveling to Los Angeles from his home in Michigan with his best friend Kaylee, Jason tries to break into show business--literally. The result? Through a series of pranks and ruses, Jason brings one of Hollywood's most powerful producers to his knees.