The Big Bang Theory - Season 4

The Big Bang Theory - Season 4

Season 4

Sheldon begins a platonic relationship with Amy, Howard reconnects with Bernadette eventually asking her to marry him, Leonard begins to date Raj's sister Priya, Penny becomes friends with Amy and expresses regret at breaking up with Leonard.

Network
Episodes24
DatesSept. 23, 2010 - Mai 19, 2011
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Episodes

The Robotic Manipulation
Season 4Episode 130 min

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.

Sept. 23, 2010
The Cruciferous Vegetable Amplification
Season 4Episode 230 min

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.

Sept. 30, 2010
The Zazzy Substitution
Season 4Episode 330 min

The Zazzy Substitution

The guys are concerned as Sheldon searches for an alternative to human companionship.

Okt. 7, 2010
The Hot Troll Deviation
Season 4Episode 430 min

The Hot Troll Deviation

An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.

Okt. 14, 2010
The Desperation Emanation
Season 4Episode 530 min

The Desperation Emanation

Leonard realizes he's the only one without a girlfriend, while Sheldon wants to get rid of his.

Okt. 21, 2010
The Irish Pub Formulation
Season 4Episode 630 min

The Irish Pub Formulation

Leonard keeps an affair secret from Sheldon, Howard and Raj.

Okt. 28, 2010
The Apology Insufficiency
Season 4Episode 730 min

The Apology Insufficiency

Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.

Nov. 4, 2010
The 21-Second Excitation
Season 4Episode 830 min

The 21-Second Excitation

While the guys camp in line for a screening, Penny and Bernadette invite Amy to her first slumber party.

Nov. 11, 2010
The Boyfriend Complexity
Season 4Episode 930 min

The Boyfriend Complexity

Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.

Nov. 18, 2010
The Alien Parasite Hypothesis
Season 4Episode 1030 min

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.

Dez. 9, 2010
The Justice League Recombination
Season 4Episode 1130 min

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.

Dez. 16, 2010
The Bus Pants Utilization
Season 4Episode 1230 min

The Bus Pants Utilization

Leonard's idea for a smartphone app derails his friendship with Sheldon.

Jan. 6, 2011
The Love Car Displacement
Season 4Episode 1330 min

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.

Jan. 20, 2011
The Thespian Catalyst
Season 4Episode 1430 min

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.

Feb. 3, 2011
The Benefactor Factor
Season 4Episode 1530 min

The Benefactor Factor

A wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.

Feb. 10, 2011
The Cohabitation Formulation
Season 4Episode 1630 min

The Cohabitation Formulation

As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.

Feb. 17, 2011
The Toast Derivation
Season 4Episode 1730 min

The Toast Derivation

Sheldon struggles to cope when he realizes it's actually Leonard who is the center of their social group.

Feb. 24, 2011
The Prestidigitation Approximation
Season 4Episode 1830 min

The Prestidigitation Approximation

Leonard must choose between new girlfriend Priya and his friendship with Penny. Meanwhile, Howard drives Sheldon crazy with a magic trick.

März 10, 2011
The Zarnecki Incursion
Season 4Episode 1930 min

The Zarnecki Incursion

When someone hacks Sheldon's online game account, the guys go on a quest to find the culprit.

März 31, 2011
The Herb Garden Germination
Season 4Episode 2030 min

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.

Apr. 7, 2011
The Agreement Dissection
Season 4Episode 2130 min

The Agreement Dissection

When Priya uses her lawyer skills to pick apart the roommate agreement, the girls take Sheldon dancing.

Apr. 28, 2011
The Wildebeest Implementation
Season 4Episode 2230 min

The Wildebeest Implementation

Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.

Mai 5, 2011
The Engagement Reaction
Season 4Episode 2330 min

The Engagement Reaction

When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.

Mai 12, 2011
The Roommate Transmogrification
Season 4Episode 2430 min

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.

Mai 19, 2011

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