The Big Bang Theory
Season 4
201024 episodes
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).
Episode 1
The Robotic Manipulation
Sep 23, 201021m
TMDB rating 8.0TMDB
Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.
Episode 2
The Cruciferous Vegetable Amplification
Sep 30, 201021m
TMDB rating 7.7TMDB
Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.
Episode 3
The Zazzy Substitution
Oct 7, 201021m
TMDB rating 7.5TMDB
The guys are concerned as Sheldon searches for an alternative to human companionship.
Episode 4
The Hot Troll Deviation
Oct 14, 201020m
TMDB rating 7.6TMDB
An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
Episode 5
The Desperation Emanation
Oct 21, 201021m
TMDB rating 7.3TMDB
Leonard realizes he’s the only one without a girlfriend, while Sheldon wants to get rid of his.
Episode 6
The Irish Pub Formulation
Oct 28, 201022m
TMDB rating 7.5TMDB
Leonard keeps an affair a secret from Sheldon, Howard and Raj.
Episode 7
The Apology Insufficiency
Nov 4, 201021m
TMDB rating 7.5TMDB
Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.
Episode 8
The 21-Second Excitation
Nov 11, 201019m
TMDB rating 7.7TMDB
While the guys camp in line for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.
Episode 9
The Boyfriend Complexity
Nov 18, 201021m
TMDB rating 7.9TMDB
Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.
Episode 10
The Alien Parasite Hypothesis
Dec 9, 201020m
TMDB rating 7.4TMDB
Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.
Episode 11
The Justice League Recombination
Dec 16, 201020m
TMDB rating 7.9TMDB
The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.
Episode 12
The Bus Pants Utilization
Jan 6, 201121m
TMDB rating 7.4TMDB
Leonard's idea for a smartphone app derails his friendship with Sheldon.
Episode 13
The Love Car Displacement
Jan 20, 201121m
TMDB rating 7.7TMDB
Bernadette runs into her ex-boyfriend while attending a science event with Wolowitz.
Episode 14
The Thespian Catalyst
Feb 3, 201121m
TMDB rating 7.5TMDB
Hoping it will make him a better teacher, Sheldon has Penny give him acting lessons. Raj has fantasies about a friend's girlfriend.
Episode 15
The Benefactor Factor
Feb 10, 201120m
TMDB rating 7.4TMDB
A wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.
Episode 16
The Cohabitation Formulation
Feb 17, 201120m
TMDB rating 7.4TMDB
As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.
Episode 17
The Toast Derivation
Feb 24, 201121m
TMDB rating 7.6TMDB
Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.
Episode 18
The Prestidigitation Approximation
Mar 10, 201121m
TMDB rating 7.6TMDB
Sheldon is baffled by Wolowitz's magic trick. Meanwhile, Leonard realizes dating Priya may make it impossible to continue being friends with Penny.
Episode 19
The Zarnecki Incursion
Mar 31, 201121m
TMDB rating 7.6TMDB
Sheldon'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.
Episode 20
The Herb Garden Germination
Apr 7, 201121m
TMDB rating 7.9TMDB
Sheldon and Amy decide to start several rumors about the others as a test. Meanwhile, Howard takes his relationship with Bernadette to even higher level.
Episode 21
The Agreement Dissection
Apr 28, 201121m
TMDB rating 7.4TMDB
When 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.
Episode 22
The Wildebeest Implementation
May 5, 201121m
TMDB rating 7.1TMDB
Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.
Episode 23
The Engagement Reaction
May 12, 201120m
TMDB rating 7.6TMDB
When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.
Episode 24
The Roommate Transmogrification
May 19, 201121m
TMDB rating 7.6TMDB
When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places and Penny does something she's regrets.