Set in Massachusetts, a 15-year-old named Jack Parker has everything going for him: popularity at school, an easy home life, and a high chance of winning an award that would lead him to be bat boy for the Boston Red Sox. There's just one thing; he earned them by being the biggest liar around, but little did he know that that was all going to change. One day while he was giving a speech, Mikey, one of his lies, appears. Progressively, one by one, all his lies start to come to life, starting with two angry lumberjacks and a possessive, jealous girlfriend, Lisa, from Arizona. He and his friend Ryan soon find out from a plush purple hippo from a children's restaurant/fun center that the only way to stop his lies from coming true is to tell the truth. However, Jack refuses to do it, since the award ceremony is coming soon and he doesn't want to lose. After that encounter, they soon come face-to-face with the lumberjacks, along with another one of his lies: two alien agents. They are able to escape with the help of Lisa, but only after he tells her the truth. During this time (and a few more lies later), he learns that his lies hurt those closest to him.