Season 3: Episode 36: The Merger
MERGER -- The Scranton branch and the Stamford branch of Dunder-Mifflin are merged; bringing old friends Jim and Pam back together after months apart. Michael and Dwight and the other employees deal with the changes. Steve Carell, Rainn Wilson, Jenna Fischer, John Krasinski, B.J. Novak, Melora Hardin, Leslie David Baker, Brian Baumgartner, Kate Flannery, Angela Kinsey, Oscar Nuņez, Phyllis Smith, Paul Lieberstein and Mindy Kaling also star. Ed Helms ("The Daily Show"), Rashida Jones ("Wanted"), Ursula Burton ("The West Wing"), Mike Bruner ("C.S.I") and Wayne Wilderson ("The Class") guest star.