Zach Galifianakis
Episode: 1x01 | Airdate: Jan 16, 2007
Season 1
Michael Ian Black
Episode: 1x02 | Airdate: Feb 26, 2007
David Cross
Episode: 1x03 | Airdate: Mar 19, 2007
Paul Rudd
Episode: 1x04 | Airdate: Apr 30, 2007
David Wain
Episode: 1x05 | Airdate: Jun 28, 2007
Andy Samberg
Episode: 1x06 | Airdate: Aug 1, 2007
Jack McBrayer
Episode: 1x07 | Airdate: Feb 14, 2008
Michael Cera
Episode: 1x08 | Airdate: Apr 23, 2008
Mike Birbiglia
Episode: 1x09 | Airdate: Jun 26, 2008
Michael Ian Black
Episode: 1x10 | Airdate: Dec 10, 2008