The Big Bang Theory Season 4 Episodes
Season 4 Episode Guide
Episode 1 - The Robotic ManipulationPenny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.
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Episode 2 - The Cruciferous Vegetable AmplificationRealizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.
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Episode 3 - The Zazzy SubstitutionThe guys are concerned as Sheldon searches for an alternative to human companionship.
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Episode 4 - The Hot Troll DeviationAn embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
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Episode 5 - The Desperation EmanationLeonard realizes he’s the only one without a girlfriend, while Sheldon wants to get rid of his.
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Episode 6 - The Irish Pub FormulationLeonard keeps an affair a secret from Sheldon, Howard and Raj.
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Episode 7 - The Apology InsufficiencySheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.
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Episode 8 - The 21-Second ExcitationWhile the guys camp in line for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.
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Episode 9 - The Boyfriend ComplexityPenny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.
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Episode 10 - The Alien Parasite HypothesisAmy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.
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Episode 11 - The Justice League RecombinationThe guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.
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Episode 12 - The Bus Pants UtilizationLeonard's idea for a smartphone app derails his friendship with Sheldon.
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Episode 13 - The Love Car DisplacementBernadette runs into her ex-boyfriend while attending a science event with Wolowitz.
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Episode 14 - The Thespian CatalystHoping it will make him a better teacher, Sheldon has Penny give him acting lessons. Raj has fantasies about a friend's girlfriend.
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Episode 15 - The Benefactor FactorA wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.
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Episode 16 - The Cohabitation FormulationAs Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.
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Episode 17 - The Toast DerivationSheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.
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Episode 18 - The Prestidigitation ApproximationSheldon is baffled by Wolowitz's magic trick. Meanwhile, Leonard realizes dating Priya may make it impossible to continue being friends with Penny.
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Episode 19 - The Zarnecki IncursionSheldon's World of Warcraft online game account is hacked and he is determined to find out who did it.
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Episode 20 - The Herb Garden GerminationSheldon and Amy decide to start several rumors about the others as a test. Meanwhile, Howard takes his relationship with Bernadette to even higher level.
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Episode 21 - The Agreement DissectionWhen Leonard spends too much time in the shower with Priya, Sheldon charges Leonard with two violations of the roommate agreement.
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Episode 22 - The Wildebeest ImplementationRaj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.
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Episode 23 - The Engagement ReactionWhen Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.
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Episode 24 - The Roommate TransmogrificationWhen Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places and Penny does something she's regrets.
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