This season the Big Bang gang’s romantic universe expands. On the rebound from Penny, Leonard falls into the arms of Raj’s sister Priya. Sheldon gets a girlfriend, or rather a friend who is a girl: Amy, a dour neurobiologist who declares herself besties with Penny. Howard and Bernadette heat up. And so do Raj and Bernadette (at least in Raj’s Bollywood daydream).
4 - 1The Robotic Manipulation Sep. 23, 2010
4 - 2The Cruciferous Vegetable Amplification Sep. 30, 2010
4 - 3The Zazzy Substitution Oct. 07, 2010
4 - 4The Hot Troll Deviation Oct. 14, 2010
4 - 5The Desperation Emanation Oct. 21, 2010
4 - 6The Irish Pub Formulation Oct. 28, 2010
4 - 7The Apology Insufficiency Nov. 04, 2010
4 - 8The 21-second Excitation Nov. 11, 2010
4 - 9The Boyfriend Complexity Nov. 18, 2010
4 - 10The Alien Parasite Hypothesis Dec. 09, 2010
4 - 11The Justice League Recombination Dec. 16, 2010
4 - 12The Bus Pants Utilization Jan. 06, 2011
4 - 13The Love Car Displacement Jan. 20, 2011
4 - 14The Thespian Catalyst Feb. 03, 2011
4 - 15The Benefactor Factor Feb. 10, 2011
4 - 16The Cohabitation Formulation Feb. 17, 2011
4 - 17The Toast Derivation Feb. 24, 2011
4 - 18The Prestidigitation Approximation Mar. 10, 2011
4 - 19The Zarnecki Incursion Mar. 31, 2011
4 - 20The Herb Garden Germination Apr. 07, 2011
4 - 21The Agreement Dissection Apr. 28, 2011
4 - 22The Wildebeest Implementation May. 05, 2011
4 - 23The Engagement Reaction May. 12, 2011
4 - 24The Roommate Transmogrification May. 19, 2011