Watch The Big Bang Theory S02E21
The Vegas Renormalization
Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.. You can watch The Big Bang Theory S02E21 here.
Air date: April 27, 2009 on CBS at 8:00 PM
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Watch The Big Bang Theory S02E20 - The Hofstadter Isotope
Season 2 Episode 20
Air date: April 13, 2009 on CBS
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Watch The Big Bang Theory S02E22 - The Classified Materials Turbulence
Season 2 Episode 22
Air date: May 04, 2009 on CBS