A young boy named Josh Baskin (David Moscow) wishes at an old 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 big in the next day. 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 (Jared Rushton) to New York City to find the machine that can fix his wish. There he gets a job at a toy company and develops a relationship with Susan (Elizabeth Perkins). Currently, he must learn to get used to the adult world he always wanted to be part of. Would he still like to remain an adult?