Théo is a puppet that looks like a little boy. He is lively, resourceful, imaginative and funny. Every day, Théo comes back from school and goes to play in his room while waiting for his parents to return. Lou, his favorite babysitter, comes to keep him company and enters his fantastic world with great enthusiasm. She's the best goalie in the world! Accompanied by Monster-under-the-bed and Mousse-douce, they invent and experience all kinds of adventures.