After failing a major opportunity to capture a monster, Bruce Average is overcome with self-doubt and decides to quit monster hunting for good. Seeking a simpler life, he starts a new career as a pizza delivery man. While Bruce tries to adjust to his new job, Matt refuses to give up on the agency. However, Matt quickly discovers that without an adult present, the children are not taken seriously by the citizens of Joliville, and the Monster Agency struggles to function. Matt must find a way to restore his father's confidence and bring him back to the team.