Last episode
The Stockholm Syndrome
s12e24 · 2019-05-17
Ended · US
The Big Bang Theory
CBS Scripted
What it is
The Big Bang Theory is a comedy about brilliant physicists, Leonard and Sheldon, who are the kind of "beautiful minds" that understand how the universe works. But none of that genius helps them interact with people, especially women. All this begins to change when a free-spirited beauty named Penny moves in next door. Sheldon, Leonard's roommate, is quite content spending his nights playing Klingon Boggle with their socially dysfunctional friends, fellow Cal Tech scientists Wolowitz and Koothrappali. However, Leonard sees in Penny a whole new universe of possibilities... including love.
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Episode guide
24 this season · 279 totals04e01 The Robotic Manipulation 2010-09-24 00:00
The Robotic Manipulation
Penny finds herself along for the ride on Sheldon's first date ever; while Wolowitz finds a new use for a robotic arm.
s04e02 The Cruciferous Vegetable Amplification 2010-10-01 00:00
The Cruciferous Vegetable Amplification
Sheldon realizes he won't live long enough to download his consciousness into a robot body, and attempts to extend his lifespan.
s04e03 The Zazzy Substitution 2010-10-08 00:00
The Zazzy Substitution
The guys are concerned as Sheldon searches for an alternative to human companionship.
s04e04 The Hot Troll Deviation 2010-10-15 00:00
The Hot Troll Deviation
An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
s04e05 The Desperation Emanation 2010-10-22 00:00
The Desperation Emanation
Leonard realizes he's the only one without a girlfriend, while Sheldon wants to get rid of his.
s04e06 The Irish Pub Formulation 2010-10-29 00:00
The Irish Pub Formulation
Leonard keeps an affair secret from Sheldon, Howard and Raj.
s04e07 The Apology Insufficiency 2010-11-05 00:00
The Apology Insufficiency
Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.
s04e08 The 21-Second Excitation 2010-11-12 01:00
The 21-Second Excitation
While the guys camp in line for a screening, Penny and Bernadette invite Amy to her first slumber party.
s04e09 The Boyfriend Complexity 2010-11-19 01:00
The Boyfriend Complexity
Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.
s04e10 The Alien Parasite Hypothesis 2010-12-10 01:00
The Alien Parasite Hypothesis
Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.
s04e11 The Justice League Recombination 2010-12-17 01:00
The Justice League Recombination
The guys find a 'super' use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.
s04e12 The Bus Pants Utilization 2011-01-07 01:00
The Bus Pants Utilization
Leonard's idea for a smartphone app derails his friendship with Sheldon.
s04e13 The Love Car Displacement 2011-01-21 01:00
The Love Car Displacement
Tension runs high when everyone is staying at the same hotel for a science event and Bernadette runs into her ex-boyfriend.
s04e14 The Thespian Catalyst 2011-02-04 01:00
The Thespian Catalyst
Sheldon hopes acting lessons from Penny will help him become a better teacher. Meanwhile, Koothrappali fantasizes about his best friend's girlfriend.
s04e15 The Benefactor Factor 2011-02-11 01:00
The Benefactor Factor
A wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.
s04e16 The Cohabitation Formulation 2011-02-18 01:00
The Cohabitation Formulation
As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.
s04e17 The Toast Derivation 2011-02-25 01:00
The Toast Derivation
Sheldon struggles to cope when he realizes it's actually Leonard who is the center of their social group.
s04e18 The Prestidigitation Approximation 2011-03-11 01:00
The Prestidigitation Approximation
Leonard must choose between new girlfriend Priya and his friendship with Penny. Meanwhile, Howard drives Sheldon crazy with a magic trick.
s04e19 The Zarnecki Incursion 2011-04-01 00:00
The Zarnecki Incursion
When someone hacks Sheldon's online game account, the guys go on a quest to find the culprit.
s04e20 The Herb Garden Germination 2011-04-08 00:00
The Herb Garden Germination
Sheldon and Amy experiment on their friends by spreading gossip, while Howard takes a big step in his relationship with Bernadette.
s04e21 The Agreement Dissection 2011-04-29 00:00
The Agreement Dissection
When Priya uses her lawyer skills to pick apart the roommate agreement, the girls take Sheldon dancing.
s04e22 The Wildebeest Implementation 2011-05-06 00:00
The Wildebeest Implementation
Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.
s04e23 The Engagement Reaction 2011-05-13 00:00
The Engagement Reaction
When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.
s04e24 The Roommate Transmogrification 2011-05-20 00:00
The Roommate Transmogrification
When Bernadette receives her Ph.D., the guys take joy in reminding an emasculated Wolowitz that he is the only one in their group who isn't a doctor. Meanwhile, Koothrappali becomes Sheldon's new roommate after hearing Leonard and Priya engaging in a 'Star Trek' bedroom fantasy.