05/14/2009 (09:31PM - 10:00PM) (Thursday) : SEASON THREE FINALE: MILTON'S (GUEST STAR ALAN ALDA) HEALTH IS AT RISK, WHILE LIZ (TINA FEY) ENJOYS NEW FOUND FAME AS A RELATIONSHIP EXPERT. SHERRI SHEPHERD, SHERYL CROW, MARY J. BLIGE, ELVIS COSTELLO, CLAY AIKEN, ADAM LEVINE GUEST STAR WITH OTHER SURPRISE MUSICAL GUESTS.
As Jack (Alec Baldwin) begins to build a relationship with his biological father, Milton's (Alda) health hangs in the balance. Despite Liz's (Fey) relationship track record, she draws public attention as a relationship expert after a talk show appearance. Meanwhile, Tracy's (Tracy Morgan) high school invites him to speak at graduation and Kenneth (Jack McBrayer) must help him overcome embarrassing memories from his high school experience. Jane Krakowski and Katrina Bowden also star.