When Ms. Tingly quits the position of handling the school's morning mail, Mr. Haney selects the first student mail carrier. Many students try out, but in the end, Buster makes the cut. On the first day of the job, he mixes up the letters, resulting in several delivery problems around the school, but with advice from the neighborhood mailman, Buster learns what doing the job well is all about. Buster becomes very proud of his job, but finds that it's taking a lot out of him. (thetvdb.com)