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PRIMETIME EMMYS® 3X nominee in 2019

The Big Bang Theory

Leonard and Sheldon are brilliant physicists, but none of that genius helps them interact with people, especially women. All this begins to change when a free-spirited beauty, Penny, moves in next door. Sheldon is content spending his nights playing Klingon Boggle with their socially dysfunctional friends. However, Leonard sees in Penny a whole new universe of possibilities ... including love.
IMDb 8.1200624 episodes
TV-PG
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Episodes

  1. S4 E1 - The Robotic Manipulation
    September 22, 2010
    21min
    TV-14
    Penny finds herself along for the ride on Sheldon's first date ever. Meanwhile, Wolowitz finds a new use for a robotic arm.
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  2. S4 E2 - The Cruciferous Vegetable Amplification
    September 29, 2010
    21min
    TV-PG
    When Sheldon realizes he won't live long enough to download his consciousness into a robot body, he attempts to extend his lifespan. Apple Co-Founder STEVE WOZNIAK guest stars.
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  3. S4 E3 - The Zazzy Substitution
    October 6, 2010
    21min
    TV-PG
    Sheldon and Amy (MAYIM BIALIK) break up.
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  4. S4 E4 - The Hot Troll Deviation
    October 13, 2010
    20min
    TV-14
    An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work. KATEE SACKHOFF and GEORGE TAKEI guest star as Wolowitz's love gurus.
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  5. S4 E5 - The Desperation Emanation
    October 20, 2010
    21min
    TV-14
    Amy wants Sheldon to meet her mother.
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  6. S4 E6 - The Irish Pub Formulation
    October 27, 2010
    22min
    TV-PG
    A visit from Raj's sister creates tension among the guys.
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  7. S4 E7 - The Apology Insufficiency
    December 27, 2010
    22min
    TV-PG
    ELIZA DUSHKU guest stars as an FBI Agent.
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  8. S4 E8 - The 21-Second Excitation
    November 10, 2010
    19min
    TV-14
    When the guys camp in line for a screening, their plans are thwarted by Sheldon's greatest nemesis, WIL WHEATON (guest starring as himself).
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  9. S4 E9 - The Boyfriend Complexity
    November 17, 2010
    21min
    TV-14
    Penny pulls Leonard into a lie when her dad comes to visit.
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  10. S4 E10 - The Alien Parasite Hypothesis
    December 8, 2010
    20min
    TV-14
    Sheldon's girlfriend is attracted to another man.
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  11. S4 E11 - The Justice League Recombination
    December 15, 2010
    20min
    TV-14
    Penny's new boyfriend wants to hang out with the guys.
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  12. S4 E12 - The Bus Pants Utilization
    January 5, 2011
    22min
    TV-PG
    Leonard and Sheldon fight for control of a project.
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  13. S4 E13 - The Love Car Displacement
    January 19, 2011
    21min
    TV-14
    Tension runs high when everyone is staying at the same hotel for a science event and Wolowitz worries he can't measure up to Bernadette's ex-boyfriend (guest star RICK FOX).
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  14. S4 E14 - The Thespian Catalyst
    February 2, 2011
    22min
    TV-14
    Sheldon takes acting lessons from Penny.
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  15. S4 E15 - The Benefactor Factor
    February 9, 2011
    20min
    TV-14
    A wealthy donor to the university (guest star JESSICA WALTER) makes Leonard consider how far he's willing to go for the sake of science.
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  16. S4 E16 - The Cohabitation Formulation
    February 16, 2011
    21min
    TV-14
    As Howard contemplates taking things with Bernadette to the next level, he must choose between his girlfriend and his mother. Leonard rekindles his relationship with Raj's sister.
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  17. S4 E17 - The Toast Derivation
    February 23, 2011
    21min
    TV-14
    Sheldon decides to get a new group of friends.
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  18. S4 E18 - The Prestidigitation Approximation
    March 9, 2011
    21min
    TV-14
    Leonard's girlfriend asks him to stop seeing Penny.
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  19. S4 E19 - The Zarnecki Incursion
    March 30, 2011
    21min
    TV-14
    Sheldon's online gaming character gets robbed.
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  20. S4 E20 - The Herb Garden Germination
    April 6, 2011
    21min
    TV-14
    Gossip spreads like wildfire - thanks to Sheldon & Amy.
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  21. S4 E21 - The Agreement Dissection
    April 27, 2011
    21min
    TV-PG
    Leonard's girlfriend puts Sheldon in his place.
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  22. S4 E22 - The Wildebeest Implementation
    May 4, 2011
    21min
    TV-14
    Raj attempts to solve his problem with talking to women.
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  23. S4 E23 - The Engagement Reaction
    May 11, 2011
    20min
    TV-14
    Howard finally tells his mom he's marrying Bernadette.
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  24. S4 E24 - The Roommate Transmogrification
    May 18, 2011
    21min
    TV-PG
    After hearing Leonard and Priya indulge in a Star Trek bedroom fantasy, Raj moves in with Sheldon on the fourth season finale.
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