Episode Guide :: Season 4
The Robotic Manipulation September 23, 2010
The Cruciferous Vegetable Amplification September 30, 2010
The Zazzy Substitution October 7, 2010
The Hot Troll Deviation October 14, 2010
The Desperation Emanation October 21, 2010
The Irish Pub Formulation October 28, 2010
The Apology Insufficiency November 4, 2010
The 21-Second Excitation November 11, 2010
The Boyfriend Complexity November 18, 2010
The Alien Parasite Hypothesis December 9, 2010
The Justice League Recombination December 16, 2010
The Bus Pants Utilization January 6, 2011
The Love Car Displacement January 20, 2011
The Thespian Catalyst February 3, 2011
The Benefactor Factor February 10, 2011
The Cohabitation Formulation February 17, 2011
The Toast Derivation February 24, 2011
The Prestidigitation Approximation March 10, 2011
The Zarnecki Incursion March 31, 2011
The Herb Garden Germination April 7, 2011
The Agreement Dissection April 28, 2011
The Wildebeest Implementation May 5, 2011
The Engagement Reaction May 12, 2011
The Roommate Transmogrification May 19, 2011
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.
Also available on Blu-ray
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.