Episode Guide :: Season 2

• 201
  The Bad Fish Paradigm September 22, 2008
• 202
  The Codpiece Topology September 29, 2008
• 203
  The Barbarian Sublimation October 6, 2008
• 204
  The Griffin Equivalency October 13, 2008
• 205
  The Euclid Alternative October 20, 2008
• 206
  The Cooper-Nowitzki Theorem November 3, 2008
• 207
  The Panty Pinata Polarization November 10, 2008
• 208
  The Lizard-Spock Expansion November 17, 2008
• 209
  The White Asparagus Triangulation November 24, 2008
• 210
  The Vartabedian Conundrum December 8, 2008
• 211
  The Bath Item Gift Hypothesis December 15, 2008
• 212
  The Killer Robot Instability January 12, 2009
• 213
  The Friendship Algorithm January 19, 2009
• 214
  The Financial Permeability February 2, 2009
• 215
  The Maternal Capacitance February 9, 2009
• 216
  The Cushion Saturation March 2, 2009
• 217
  The Terminator Decoupling March 9, 2009
• 218
  The Work Song Nanocluster March 16, 2009
• 219
  The Dead Hooker Juxtaposition March 30, 2009
• 220
  The Hofstadter Isotope April 13, 2009
• 221
  The Vegas Renormalization April 27, 2009
• 222
  The Classified Materials Turbulence May 4, 2009
• 223
  The Monopolar Expedition May 11, 2009

Season Recap

The Big Bang Theory's second season mainly focuses on character development and has few overarching plotlines. Leonard and Penny's relationship, which started with a date in the first season finale, ends quickly when Penny worrys she's not smart enough for Leonard. When Leonard suggests she go to college, she slams the door in his face. Leonard and Penny quickly patch up their friendship. Penny's feelings for Leonard become clearer at the end of the season, as Leonard and the guys heads away for a three-month expedition in the Arctic.

Sheldon grows more comfortable with Penny being a part of their social group during the season. A key moment in their friendship comes when Penny gave Sheldon a napkin signed by Leonard Nimoy for Christmas. Howard's womanizing ways continue throughout the season, though the break-up of his short-term relationship with Leslie Winkle reveal his more sensitive side. Raj has a moment of success when he discovers a trans-neptuinian planetoid and later shows signs of progress when he's able to briefly apologize to Penny without drinking any alcohol.

The Big Bang Theory's second season contained twenty-three episodes aired between September 22, 2008 and May 11, 2009. The show was renewed for a further two seasons in March 2009. The Big Bang Theory ranked #44 in the ratings at the end of its second season.