12/15/2007 (09:00PM - 09:30PM) (Saturday) : SPECIAL GUEST STARS INCLUDE OSCAR AND NOBEL PEACE PRIZE WINNER AL GORE, MEREDITH VIEIRA, DAVID SCHWIMMER WHO JOIN IN ON '30 ROCK'S' GREEN INITIATIVE -- As part of a GE-wide green initiative, Jack (Alec Baldwin) has come up with the idea of creating a green mascot for NBC -- a Phillie Phanatic-looking character named Greenzo. When Greenzo's eco-friendly preachiness gets obnoxiously out of hand in "TGS with Tracy Jordan" offices and on a promotional tour, it's Liz (Tina Fey) who gets fed up the most with the ridiculous character. Kenneth (Jack McBrayer) is planning his annual house party, a boring little soiree where Liz has been the only one who ever shown up in the past. Tracy (Tracy Morgan) wants the party to be a success for Kenneth, so he spreads a few little rumors to get the event hopping, but simple office gossip gets out of control. Jane Krakowski, Lonny Ross, Judah Friedlander, Scott Adsit, Katrina Bowden and Maulik Pancholy also star. Special guest stars include Oscar and Nobel Prize winner Al Gore, Meredith Vieira (NBC's "Today") and David Schwimmer.