Source: http://the-big-bang-theory.com/
CBS has announced the details of episode 2.21, which will air April 27th.
"The Vegas Renormalization" — Leonard and Koothrappali take a heartbroken Wolowitz to Las Vegas, leaving Sheldon locked out of his apartment and forced to bunk with Penny, on THE BIG BANG THEORY, Monday, April 27 (8:00–8:30 PM, ET/PT) on the CBS Television Network.
Jodi Lyn O’Keefe (“Prison Break”) Guest Stars.
