While driving in a highway to the wedding of his beloved Betty-Ann, Adam is surprised by his former schoolmate Harley on the backseat of his car. Adam has broken off with the inconvenient and moron Harley because of Betty-Ann. Along their road trip, Harley makes fun of some rednecks in a bar and later their car is chased by a giant monster truck on the road. After some incidents, they give a lift to the hitchhiker Sarah and sooner the trio is terrorized by a scary monster driving the monster truck.