Henri devient un clown pour participer à un numéro de cirque.

Henry meets a friendly Balloon. He's preparing for the big circus show but the clown has gone missing. Henry becomes a Clown for the day, bounces on a trampoline, is fired from a cannon and throws custard pies as he helps save the show.

Henry is a young boy who desires to learn something new in his everyday life. In each episode, he meets a new object and his imagination comes to life as he learns more with each new encounter. Henry creates so many friendships and everyone he meets is eager to help him find the answers to every new question.