The Office - Episode 9.05 - Here Comes Treble - Press Release

10/25/2012 (09:00PM - 09:31PM) (Thursday) : ANDY DEALS WITH A CAPPELLA DRAMA—STEPHEN COLBERT GUEST STARS ("The Colbert Report")—It’s Halloween in the office and Andy (Ed Helms) invites his college a cappella group to perform, which leads to a confrontation with his frenemy Broccoli Rob (guest star Stephen Colbert). Meanwhile, Dwight (Rainn Wilson) finds evidence that a madman is loose in the office and tries to track him down, and the first meeting of Jim’s (John Krasinski) new job causes a fight with Pam.
Jenna Fischer, Leslie David Baker, Phyllis Smith, Angela Kinsey, Brian Baumgartner, Oscar Nunez, Kate Flannery, Paul Lieberstein, Creed Bratton, Craig Robinson, Ellie Kemper, Catherine Tate, Clarke Duke and Jake Lacy also star.

Source: NBC