Season 4
(2010)
Overview
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).
Cast
as Leonard Hofstadter
as Sheldon Cooper
as Penny
as Howard Wolowitz
as Rajesh Koothrappali
as Bernadette Rostenkowski
as Amy Farrah Fowler
Episodes
The Robotic Manipulation 7.7
September 23, 2010
Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.
The Cruciferous Vegetable Amplification 7.7
September 30, 2010
Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his lif…
The Zazzy Substitution 7.4
October 7, 2010
The guys are concerned as Sheldon searches for an alternative to human companionship.
The Hot Troll Deviation 7.5
October 14, 2010
An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
The Desperation Emanation 7.2
October 21, 2010
Leonard realizes he’s the only one without a girlfriend, while Sheldon wants to get rid of his.
The Irish Pub Formulation 7.3
October 28, 2010
Leonard keeps an affair a secret from Sheldon, Howard and Raj.
The Apology Insufficiency 7.4
November 4, 2010
Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.
The 21-Second Excitation 7.6
November 11, 2010
While the guys camp in line for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber pa…
The Boyfriend Complexity 7.7
November 18, 2010
Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.
The Alien Parasite Hypothesis 7.2
December 9, 2010
Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better …
The Justice League Recombination 7.7
December 16, 2010
The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.
The Bus Pants Utilization 7.2
January 6, 2011
Leonard's idea for a smartphone app derails his friendship with Sheldon.
The Love Car Displacement 7.4
January 20, 2011
Bernadette runs into her ex-boyfriend while attending a science event with Wolowitz.
The Thespian Catalyst 7.3
February 3, 2011
Hoping it will make him a better teacher, Sheldon has Penny give him acting lessons. Raj has fantasies about a friend's…
The Benefactor Factor 7.2
February 10, 2011
A wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.
The Cohabitation Formulation 7.3
February 17, 2011
As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's…
The Toast Derivation 7.5
February 24, 2011
Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of t…
The Prestidigitation Approximation 7.3
March 10, 2011
Sheldon is baffled by Wolowitz's magic trick. Meanwhile, Leonard realizes dating Priya may make it impossible to contin…
The Zarnecki Incursion 7.3
March 31, 2011
Sheldon's online-game account is hacked by Todd Zarnecki, who then proceeds to steal all his items prompting the guys t…
The Herb Garden Germination 7.7
April 7, 2011
Sheldon and Amy decide to start several rumors about the others as a test. Meanwhile, Howard takes his relationship wit…
The Agreement Dissection 7.3
April 28, 2011
When Leonard spends too much time in the shower with Priya, Sheldon charges Leonard with two violations of the roommate…
The Wildebeest Implementation 6.8
May 5, 2011
Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.
The Engagement Reaction 7.5
May 12, 2011
When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.
The Roommate Transmogrification 7.6
May 19, 2011
When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places and Penny does something she'…