High Quality Content by WIKIPEDIA articles! "Dunder Mifflin Infinity" is the third (and fourth) episode of the fourth season of the American comedy television series The Office, and the show`s fifty-sixth (and fifty-seventh) episode overall. The episode was written by Michael Schur, who also acts in the show, and directed by Craig Zisk. It first aired in the United States on October 4, 2007 on NBC.