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Season two begins to deal with character development, including Sheldon becoming more and more obsessive.
Leonard and Penny's relationship takes a turn for the worse when they break up, but this is quickly resolved.
Leslie expects Leonard to back her beliefs, but when he supports Sheldon, Leslie dumps Leonard, to Sheldon's relief.
Meanwhile, Rajesh manages to briefly apologize to Penny for what he did in "The Griffin Equivalency" without having consumed alcohol.
Sheldon tells Penny he is uncomfortable with Leonard dating his arch enemy Leslie, but on Penny's advice he accepts the relationship.
Almost immediately, however, Sheldon deliberately provokes an argument with Leslie over the validity of loop quantum gravity, which Leslie supports, and string theory, which Sheldon favors.
The second season of the American sitcom The Big Bang Theory was originally aired on CBS from September 22, 2008, to May 11, 2009, over 23 episodes.
The Complete Season DVD was released September 15, 2009, and a Blu-ray version was reissued on July 10, 2012, with remastered surround sound audio, whereas the DVD version only had stereo.