30 Rock Season 3, Episode 22 : Kidney Now!
Jack gets to know his newly discovered father, but soon discovers Milton (Alan Alda) has a serious medical condition to contend with. Liz gains notoriety as a relationship expert for a sketch she wrote. Meanwhile, Tracy is invited to speak at his former high school's graduation and Kenneth tries to help him overcome troubling memories from his high school experience. Guest stars included Elvis Costello, Mary J. Blige, Sheryl Crow, Clay Aiken, Adam Levine, Adrock and Mike D of Beastie Boys, Michael McDonald, Rhett Miller, Wyclef Jean, Steve Earle, Moby, Cyndi Lauper, Sara Bareilles, Robert Randolph, Rachel Yamagata, Talib Kweli, and Norah Jones. Guest Stars: Cyndi Lauper, Alan Alda, Adam Horovitz, Mary J. Blige, Clay Aiken, Elvis Costello, Norah Jones, Moby, Michael McDonald, Kay Cannon, Adam Levine, Talib Kweli, Sara Bareilles, Wyclef Jean, Sheryl Crow, Michael Diamond, Rachael Yamagata, Donald Glover, Grizz Chapman, Sherri Shepherd, Napiera Groves, Steve Earle, Rhett Miller, Matt Ballinger, Capathia Jenkins, Emalee Burditt, Helen Coxe, Paula Pell, Sue Galloway, Chris Parnell, Kevin Brown,
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