Henry meets a Letter as he prepares for her first trip out into the world. She has missed the postman so it falls on Henry to save the day. Henry becomes a Postman but gets lost in the sorting office before finally delivering Letter on time.

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.