Episode Guide :: Season 4

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# Episode Title Original Air Date
4.01 The Robotic Manipulation September 23, 2010
4.02 The Cruciferous Vegetable Amplification September 30, 2010
4.03 The Zazzy Substitution October 7, 2010
4.04 The Hot Troll Deviation October 14, 2010
4.05 The Desperation Emanation October 21, 2010
4.06 The Irish Pub Formulation October 28, 2010
4.07 The Apology Insufficiency November 4, 2010
4.08 The 21-Second Excitation November 11, 2010
4.09 The Boyfriend Complexity November 18, 2010
4.10 The Alien Parasite Hypothesis December 9, 2010
4.11 The Justice League Recombination December 16, 2010
4.12 The Bus Pants Utilization January 6, 2011
4.13 The Love Car Displacement January 20, 2011
4.14 The Thespian Catalyst February 3, 2011
4.15 The Benefactor Factor February 10, 2011
4.16 The Cohabitation Formulation February 17, 2011
4.17 The Toast Derivation February 24, 2011
4.18 The Prestidigitation Approximation March 10, 2011
4.19 The Zarnecki Incursion March 31, 2011
4.20 The Herb Garden Germination April 7, 2011
4.21 The Agreement Dissection April 28, 2011
4.22 The Wildebeest Implementation May 5, 2011
4.23 The Engagement Reaction May 12, 2011
4.24 The Roommate Transmogrification May 19, 2011

Season Recap

The Big Bang Theory's fourth season focuses on character growth as Sheldon enters a platonic relationship with Amy, Howard restarts his romance with Bernadette, and Leonard starts a serious relationship with Raj's sister Priya.

As Sheldon becomes comfortable spending more time with Amy, his "girl who is a friend but not a girlfriend", starts to spend more time with the group and forms friendship with Penny. Howard's girlfriend Bernadette also becomes a part of the group. After dating for a few months, Howard and Bernadette get engaged after he proposes.

Leonard enters a long-term relationship with Priya, Raj's sister, after she moves to Pasadena. Seeing Leonard with another women, Penny begins to regret breaking up with him. In the season finale, after a night of drinking, Raj and Penny get very close.

The Big Bang Theory's fourth season contained twenty-four episodes aired between September 23, 2010 and May 19, 2011. For its fourth season, The Big Bang Theory moved to Thursdays at 8:00 on CBS, to form a new comedy block. Although the show continued to perform well in the ratings, it fell somewhat from the third season. The new timeslot lacked the strong lead-in the show had on Mondays, with TV's then-#1 sitcom Two and a Half Men, and suffered fewer people watching TV at the earlier time. Kaley Cuoco was absent from two episodes during the season, due to a broken leg from a horseback-riding accident.

Season 4 DVD

Available now

Relive the complete fourth season of The Big Bang Theory again with this three-disc DVD box-set. Featuring all twenty-four episodes of the show's fourth season along with never-before-seen bonus features.

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