Season 4
24 episodes · Sep 23, 2010
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).
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S4E1The Robotic Manipulation
Sep 23, 201021mPenny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.
S4E2The Cruciferous Vegetable Amplification
Sep 30, 201021mRealizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.
S4E3The Zazzy Substitution
Oct 7, 201021mThe guys are concerned as Sheldon searches for an alternative to human companionship.
S4E4The Hot Troll Deviation
Oct 14, 201020mAn embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
S4E5The Desperation Emanation
Oct 21, 201021mLeonard realizes he’s the only one without a girlfriend, while Sheldon wants to get rid of his.
S4E6The Irish Pub Formulation
Oct 28, 201022mLeonard keeps an affair a secret from Sheldon, Howard and Raj.
S4E7The Apology Insufficiency
Nov 4, 201021mSheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.
S4E8The 21-Second Excitation
Nov 11, 201019mWhile the guys camp in line for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.
S4E9The Boyfriend Complexity
Nov 18, 201021mPenny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.
S4E10The Alien Parasite Hypothesis
Dec 9, 201020mAmy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.
S4E11The Justice League Recombination
Dec 16, 201020mThe guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.
S4E12The Bus Pants Utilization
Jan 6, 201121mLeonard's idea for a smartphone app derails his friendship with Sheldon.
S4E13The Love Car Displacement
Jan 20, 201121mBernadette runs into her ex-boyfriend while attending a science event with Wolowitz.
S4E14The Thespian Catalyst
Feb 3, 201121mHoping it will make him a better teacher, Sheldon has Penny give him acting lessons. Raj has fantasies about a friend's girlfriend.
S4E15The Benefactor Factor
Feb 10, 201120mA wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.
S4E16The Cohabitation Formulation
Feb 17, 201120mAs Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.
S4E17The Toast Derivation
Feb 24, 201121mSheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.
S4E18The Prestidigitation Approximation
Mar 10, 201121mSheldon is baffled by Wolowitz's magic trick. Meanwhile, Leonard realizes dating Priya may make it impossible to continue being friends with Penny.
S4E19The Zarnecki Incursion
Mar 31, 201121mSheldon's online-game account is hacked by Todd Zarnecki, who then proceeds to steal all his items prompting the guys to go on a quest to retrieve them. Penny, Bernadette and Amy discuss how Penny groomed Leonard to be willing to try various things and more adventurous boyfriend... for some other woman — Priya.
S4E20The Herb Garden Germination
Apr 7, 201121mSheldon and Amy decide to start several rumors about the others as a test. Meanwhile, Howard takes his relationship with Bernadette to even higher level.
S4E21The Agreement Dissection
Apr 28, 201121mWhen Leonard spends too much time in the shower with Priya, Sheldon charges Leonard with two violations of the roommate agreement. However, before he can get too far, Priya uses her skills as a lawyer to nullify the charges due to the agreement's vague wording, much to Sheldon's dismay. When the guys take advantage of Priya's skills in order to eat Greek food on pizza night, Sheldon goes to Penny, who invites him to a girls' night out with Amy and Bernadette, which Sheldon agrees to after Penny mentions that they may be talking trash about Priya. After the girls drink some cocktails, they decide to take Sheldon dancing, which Sheldon reluctantly goes along with. After dancing, Sheldon takes an intoxicated Amy back to her apartment and as well as talking about Priya, meets a monkey who is addicted to smoking cigarettes. Amy tells Sheldon not to give in to Priya's law skills, before kissing him and going to her bathroom to vomit.
S4E22The Wildebeest Implementation
May 5, 201121mRaj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.
S4E23The Engagement Reaction
May 12, 201120mWhen Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.
S4E24The Roommate Transmogrification
May 19, 201121mWhen Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places and Penny does something she's regrets.