"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.In this episode, Ryan returns to his old office and reveals his plan to bring technology to Dunder Mifflin.