The 100th episode of the hit Fox musical series "Glee" airs March 18 and features original New Directions members Amber Riley (Mercedes), Mark Salling (Puck), Dianna Agron (Quinn), Harry Shum, Jr. (Mike) and Heather Morris (Brittany) as well as Chace Crawford and Tony Award winner Kristin Chenoweth.
SOURCE: Playbill at 12:00AM on March 18, 2014