The Big Bang Theory - Season 2 Apr 2026

: An escalating "war" between Sheldon and Penny after she violates his house rules.

Season 2 of The Big Bang Theory originally aired on CBS from September 22, 2008, to May 11, 2009. Spanning 23 episodes, this season is widely regarded as a turning point that solidified the show's cultural status, earning a 100% Tomatometer score on Rotten Tomatoes . Core Cast & Key Characters The Big Bang Theory - Season 2

Season 2 received significantly higher praise than Season 1, with critics noting sharper writing and better character growth. won his first of four Emmy Awards for Outstanding Lead Actor in a Comedy Series based on his performance this season, specifically submitting "The Bath Item Gift Hypothesis" for consideration. : An escalating "war" between Sheldon and Penny

: In the season finale, "The Monopolar Expedition," the four guys travel to the North Pole for three months to prove String Theory, leaving Penny alone to reflect on her feelings for Leonard. Top-Rated Episodes Core Cast & Key Characters Season 2 received