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Big Bang Theory

Big Bang Theory (CBS) Returns: Monday, March 17 at 8:00 pm ET So Far This Season: Brilliant, but socially challenged roommates Sheldon (Jim Parsons) and Leonard (Johnny Galecki) have slowly grown accustomed to their hot neighbor Penny (Kaley Cuoco), but not too accustomed, because otherwise... Jim Parsons, Johnny Galecki and Kaley Cuoco on 'Big Bang Theory' photo courtesy of CBS