In the bustling city of New York, the Little family is typical, but their lives take an unexpected turn when they decide to adopt a very peculiar new member: a small mouse named Stuart. Despite his tiny size, Stuart has a big personality and boundless energy. From the start, his adjustment to life in the Little household is not easy, as he must earn the love and acceptance of the rest of the family, especially George, the youngest son, who is initially not very excited about having a mouse as a brother.
As the days go by, Stuart begins to show that he is not just any mouse. From zooming around the park in his little car to embarking on adventures that challenge the laws of reality, this intrepid rodent soon becomes a hero in his own right. But not everything is joyful in Stuart's life; his eternal struggle for acceptance is threatened when a wicked cat named Snowbell stands in his way, creating a conflict that endangers both his life and that of his new friends.
With a touch of comedy and a healthy dose of family values, the story of a mouse who seeks to belong and be loved reminds us that no matter our size or appearance, we can overcome any adversity when we support one another.