The Big Bang Theory

The Best Episodes of The Big Bang Theory Season 4

Genre:Comedy
Network:CBS

Every episode of The Big Bang Theory Season 4 ranked from best to worst. Discover the Best Episodes of The Big Bang Theory Season 4!

Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
Episodes
24
Avg. Rating
8.0
S1
S2
S3
S4
E1
E2
E3
8.7
8.3
7.9

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  1. 8.7/10(5.1k votes)

    #1 - The Robotic Manipulation

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    S4:E1

    Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.

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    Writer:N/A
  2. 8.6/10(4.7k votes)

    #2 - The Justice League Recombination

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    S4:E11

    The 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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    Writer:N/A
  3. 8.5/10(4.3k votes)

    #3 - The Roommate Transmogrification

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    S4:E24

    When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places and Penny does something she's regrets.

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    Writer:N/A
  4. 8.4/10(4.4k votes)

    #4 - The Boyfriend Complexity

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    S4:E9

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

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    Writer:N/A
  5. 8.3/10(4.5k votes)

    #5 - The Cruciferous Vegetable Amplification

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    S4:E2

    Realizing 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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    Writer:N/A
  6. 8.2/10(4.4k votes)

    #6 - The Love Car Displacement

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    S4:E13

    Bernadette runs into her ex-boyfriend while attending a science event with Wolowitz.

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    Writer:N/A
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  8. 8.2/10(4.0k votes)

    #7 - The Herb Garden Germination

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    S4:E20

    Sheldon 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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    Writer:N/A
  9. 8.2/10(4.2k votes)

    #8 - The Agreement Dissection

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    S4:E21

    When Leonard spends too much time in the shower with Priya, Sheldon charges Leonard with two violations of the roommate agreement. However, before he can get too far, Priya uses her skills as a lawyer to nullify the charges due to the agreement's vague wording, much to Sheldon's dismay. When the guys take advantage of Priya's skills in order to eat Greek food on pizza night, Sheldon goes to Penny, who invites him to a girls' night out with Amy and Bernadette, which Sheldon agrees to after Penny mentions that they may be talking trash about Priya. After the girls drink some cocktails, they decide to take Sheldon dancing, which Sheldon reluctantly goes along with. After dancing, Sheldon takes an intoxicated Amy back to her apartment and as well as talking about Priya, meets a monkey who is addicted to smoking cigarettes. Amy tells Sheldon not to give in to Priya's law skills, before kissing him and going to her bathroom to vomit.

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    Writer:N/A
  10. 8.1/10(4.2k votes)

    #9 - The 21-Second Excitation

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    S4:E8

    While 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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    Writer:N/A
  11. 8.1/10(4.2k votes)

    #10 - The Prestidigitation Approximation

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    S4:E18

    Sheldon 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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    Writer:N/A
  12. 8.0/10(4.3k votes)

    #11 - The Hot Troll Deviation

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    S4:E4

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

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    Writer:N/A
  13. 8.0/10(4.2k votes)

    #12 - The Irish Pub Formulation

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    S4:E6

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

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    Writer:N/A
  14. 8.0/10(4.2k votes)

    #13 - The Apology Insufficiency

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    S4:E7

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

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    Writer:N/A
  15. 8.0/10(4.0k votes)

    #14 - The Zarnecki Incursion

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    S4:E19

    Sheldon's online-game account is hacked by Todd Zarnecki, who then proceeds to steal all his items prompting the guys to go on a quest to retrieve them. Penny, Bernadette and Amy discuss how Penny groomed Leonard to be willing to try various things and more adventurous boyfriend... for some other woman — Priya.

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    Director:Peter Chakos
    Writer:N/A
  16. 8.0/10(4.0k votes)

    #15 - The Engagement Reaction

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    S4:E23

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

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    Director:Howard Murray
    Writer:N/A
  17. 7.9/10(4.3k votes)

    #16 - The Zazzy Substitution

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    S4:E3

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

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    Writer:N/A
  18. 7.9/10(4.0k votes)

    #17 - The Toast Derivation

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    S4:E17

    Sheldon 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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    Writer:N/A
  19. 7.8/10(4.0k votes)

    #18 - The Cohabitation Formulation

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    S4:E16

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

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    Writer:N/A
  20. 7.7/10(4.1k votes)

    #19 - The Thespian Catalyst

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    S4:E14

    Hoping 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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    Writer:N/A
  21. 7.7/10(4.1k votes)

    #20 - The Benefactor Factor

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    S4:E15

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

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    Writer:N/A
  22. 7.7/10(3.9k votes)

    #21 - The Wildebeest Implementation

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    S4:E22

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

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    Writer:N/A
  23. 7.6/10(4.1k votes)

    #22 - The Desperation Emanation

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    S4:E5

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

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    Writer:N/A
  24. 7.6/10(4.1k votes)

    #23 - The Alien Parasite Hypothesis

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    S4:E10

    Amy 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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    Writer:N/A
  25. 7.5/10(4.1k votes)

    #24 - The Bus Pants Utilization

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    S4:E12

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

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    Writer:N/A

Season 4 Ratings Summary

"The Robotic Manipulation" is the best rated episode of "The Big Bang Theory" season 4. It scored 8.7/10 based on 5052 votes. Directed by Mark Cendrowski and written by N/A, it aired on 9/23/2010. This episode is rated 0.1 points higher than the second-best, "The Justice League Recombination".