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NBC breaks out the bright colors for its November sweeps programming with a night of Halloween-themed episodes of "The Office," "Community," "Parks and Recreation" and "30 Rock" on October 29, a special week of "Green Is Universal" programming November 15-22, an all-new DreamWorks animated special "Merry Madagascar" on Tuesday, November 17, a special Washington, D.C. episode of "The Biggest Loser"-featuring a visit to the White House kitchen garden on Tuesday, November 3-and a bounty of popular series guest stars.

The October-November guest stars featured include Elisabeth Moss, Tim Gunn, Suze Orman, Jerry Stiller, Anne Meara, Megan Mullally, Erika Christensen, NBC News' Brian Williams, Elisabeth Rohm, NFL Hall of Famer Rod Woodson, Jeff Dunham, John Laroquette, Jayma Mays, Jimmy Fallon and Christine Lahti.

As part of "Green is Universal," the company's ongoing environmental initiative, NBC will air green-themed programming November 15-22 with special episodes of "Heroes," "The Biggest Loser," "Mercy," "Trauma," "Law & Order: SVU," "Parks and Recreation," "The Office," "30 Rock" and "Law & Order."

Meanwhile, "The Biggest Loser" showcases our nation's capital with a peek inside the White House kitchen garden in a special edition from Washington, D.C. on Tuesday, November 3 (8-10 p.m. ET). Tim Gunn and Tabatha Coffey return to "The Biggest Loser" to transform the contestants on the popular makeover episode airing Tuesday, November 17 (8-10 p.m. ET). Likewise, "Loser" will catch up with some of its most popular contestants on "The Biggest Loser: Where Are They Now?" special airing Wednesday, November 25 (8-10 p.m. ET).

NBC will also feature an all-new original holiday special "Merry Madagascar" from DreamWorks Animation starring the voices of Ben Stiller, David Schwimmer, Jada Pinkett Smith and Andy Richter airing Tuesday, November 17 (8-8:30 p.m. ET).

NBC October-November Guest Star/Dates:

Ventriloquist Jeff Dunham - "30 Rock" (10/29)
Jimmy Fallon - "30 Rock" (10/29)
Elisabeth Rohm - "Heroes" (11/2, 11/23)
Jayma Mays - "Heroes" (11/2)
Jerry Stiller and Anne Meara - "Mercy" (11/4)
Elisabeth Moss - "Mercy" (11/4)
Megan Mullally - "Parks and Recreation" (11/5)
Brian Williams - "30 Rock" (11/5)
Patton Oswald, Eric Christian Olsen - "Community" (11/5)
Erika Christensen - "Mercy" (11/11)
Tim Gunn and Tabatha Coffey - "The Biggest Loser" (11/17)
Suze Orman - "The Biggest Loser" (11/24)
Rod Woodson - "The Biggest Loser" (11/24)