The Christmas Letter is a Christmas special made in 1998 and the final Mr. Men and Little Miss/Monsieur Bonhomme animation. It follows up The Christmas Rescue, which was the first Christmas special and the first episode to the series, meaning it both started as ended with a Christmas special.
The story follows Jack, a boy who tries to get his Christmas Wishlist to Father Christmas with the help of the Mr. Men & Little Misses.