A young boy named Josh Baskin (David Moscow) wishes on a carnival machine to be big, despite the fact that he does not believe that it is going to work. He is very surprised, therefore, to find himself so the next morning. Now he looks like a 30-year-old man, but he still behaves like a thirteen-year-boy. He decides to go with his best friend, Billy (Jared Rushton), to New York City to find the machine that can undo his wish. There, he gets a job at a toy company and develops a relationship with a woman named Susan (Elizabeth Perkins). Currently, he must learn to get used to the adult world he always wanted to be part of. Would he like to remain an adult?