Season 4

S04E01 – The Robotic Manipulation

Penny tags along on Sheldon's first ever date; Wolowitz finds a new use ...
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S04E02 – The Cruciferous Vegetable Amplification

Realizing he will not live long enough to download his consciousness into a ...
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S04E03 – The Zazzy Substitution

The guys are concerned as Sheldon searches for an alternative to human companionship ...
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S04E04 – The Hot Troll Deviation

An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have ...
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S04E05 – The Desperation Emanation

Leonard realizes he’s the only one without a girlfriend, while Sheldon wants to ...
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S04E06 – The Irish Pub Formulation

Leonard keeps an affair a secret from Sheldon, Howard and Raj. The Big ...
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S04E07 – The Apology Insufficiency

Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy. The ...
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S04E08 – The 21-second Excitation

While the guys camp in line for a long-awaited movie screening, Penny and ...
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S04E09 – The Boyfriend Complexity

Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette ...
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S04E10 – The Alien Parasite Hypothesis

Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz ...
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S04E11 – The Justice League Recombination

The guys find a "super" use for Penny's new boyfriend, Zack, when they ...
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S04E12 – The Bus Pants Utilization

Leonard's idea for a smartphone app derails his friendship with Sheldon. The Big ...
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S04E13 – The Love Car Displacement

Bernadette runs into her ex-boyfriend while attending a science event with Wolowitz. The ...
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S04E14 – The Thespian Catalyst

Hoping it will make him a better teacher, Sheldon has Penny give him ...
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S04E15 – The Benefactor Factor

A wealthy donor to the university makes Leonard consider how far he's willing ...
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S04E16 – The Cohabitation Formulation

As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles ...
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S04E17 – The Toast Derivation

Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and ...
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S04E18 – The Prestidigitation Approximation

Sheldon is baffled by Wolowitz's magic trick. Meanwhile, Leonard realizes dating Priya may ...
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S04E19 – The Zarnecki Incursion

Sheldon's World of Warcraft online game account is hacked and he is determined ...
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S04E20 – The Herb Garden Germination

Sheldon and Amy decide to start several rumors about the others as a ...
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S04E21 – The Agreement Dissection

When Leonard spends too much time in the shower with Priya, Sheldon charges ...
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S04E22 – The Wildebeest Implementation

Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to ...
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S04E23 – The Engagement Reaction

When Howard finally breaks the news to his mom that he's engaged to ...
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S04E24 – The Roommate Transmogrification

When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places ...
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