Watch The Big Bang Theory S02E20
The Hofstadter Isotope
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.. You can watch The Big Bang Theory S02E20 here.
Air date: April 13, 2009 on CBS at 8:00 PM
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Watch The Big Bang Theory S02E19 - The Dead Hooker Juxtaposition
Season 2 Episode 19
Air date: March 30, 2009 on CBS
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Watch The Big Bang Theory S02E21 - The Vegas Renormalization
Season 2 Episode 21
Air date: April 27, 2009 on CBS