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The Best Episodes of The Big Bang Theory Season 4

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.
Genre:Comedy
Network:CBS

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 4952 votes. Directed by Mark Cendrowski and written by N/A, it aired on 9/23/2010. This episode is rated 0.4 points higher than the second-best, "The Cruciferous Vegetable Amplification".

  • The Robotic Manipulation
    8.7/104,952 votes

    #1 - The Robotic Manipulation

    Season 4 Episode 1 - Aired 9/23/2010

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Cruciferous Vegetable Amplification
    8.3/104,436 votes

    #2 - The Cruciferous Vegetable Amplification

    Season 4 Episode 2 - Aired 9/30/2010

    Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.

    Director: Mark Cendrowski

    Writer: N/A

  • The Zazzy Substitution
    7.9/104,197 votes

    #3 - The Zazzy Substitution

    Season 4 Episode 3 - Aired 10/7/2010

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Hot Troll Deviation
    8.0/104,175 votes

    #4 - The Hot Troll Deviation

    Season 4 Episode 4 - Aired 10/14/2010

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Desperation Emanation
    7.6/104,015 votes

    #5 - The Desperation Emanation

    Season 4 Episode 5 - Aired 10/21/2010

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Irish Pub Formulation
    8.0/104,083 votes

    #6 - The Irish Pub Formulation

    Season 4 Episode 6 - Aired 10/28/2010

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Apology Insufficiency
    8.0/104,113 votes

    #7 - The Apology Insufficiency

    Season 4 Episode 7 - Aired 11/4/2010

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

    Director: Mark Cendrowski

    Writer: N/A

  • The 21-Second Excitation
    8.1/104,119 votes

    #8 - The 21-Second Excitation

    Season 4 Episode 8 - Aired 11/11/2010

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Boyfriend Complexity
    8.4/104,310 votes

    #9 - The Boyfriend Complexity

    Season 4 Episode 9 - Aired 11/18/2010

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Alien Parasite Hypothesis
    7.6/103,992 votes

    #10 - The Alien Parasite Hypothesis

    Season 4 Episode 10 - Aired 12/9/2010

    Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.

    Director: Mark Cendrowski

    Writer: N/A

  • The Justice League Recombination
    8.6/104,586 votes

    #11 - The Justice League Recombination

    Season 4 Episode 11 - Aired 12/16/2010

    The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.

    Director: Mark Cendrowski

    Writer: N/A

  • The Bus Pants Utilization
    7.5/103,987 votes

    #12 - The Bus Pants Utilization

    Season 4 Episode 12 - Aired 1/6/2011

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Love Car Displacement
    8.2/104,285 votes

    #13 - The Love Car Displacement

    Season 4 Episode 13 - Aired 1/20/2011

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

    Director: Anthony Joseph Rich

    Writer: N/A

  • The Thespian Catalyst
    7.7/104,054 votes

    #14 - The Thespian Catalyst

    Season 4 Episode 14 - Aired 2/3/2011

    Hoping it will make him a better teacher, Sheldon has Penny give him acting lessons. Raj has fantasies about a friend's girlfriend.

    Director: Mark Cendrowski

    Writer: N/A

  • The Benefactor Factor
    7.7/104,002 votes

    #15 - The Benefactor Factor

    Season 4 Episode 15 - Aired 2/10/2011

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Cohabitation Formulation
    7.8/103,872 votes

    #16 - The Cohabitation Formulation

    Season 4 Episode 16 - Aired 2/17/2011

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Toast Derivation
    7.9/103,907 votes

    #17 - The Toast Derivation

    Season 4 Episode 17 - Aired 2/24/2011

    Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.

    Director: Mark Cendrowski

    Writer: N/A

  • The Prestidigitation Approximation
    8.1/104,089 votes

    #18 - The Prestidigitation Approximation

    Season 4 Episode 18 - Aired 3/10/2011

    Sheldon is baffled by Wolowitz's magic trick. Meanwhile, Leonard realizes dating Priya may make it impossible to continue being friends with Penny.

    Director: Mark Cendrowski

    Writer: N/A

  • The Zarnecki Incursion
    8.0/103,975 votes

    #19 - The Zarnecki Incursion

    Season 4 Episode 19 - Aired 3/31/2011

    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.

    Director: Peter Chakos

    Writer: N/A

  • The Herb Garden Germination
    8.2/103,968 votes

    #20 - The Herb Garden Germination

    Season 4 Episode 20 - Aired 4/7/2011

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Agreement Dissection
    8.2/104,074 votes

    #21 - The Agreement Dissection

    Season 4 Episode 21 - Aired 4/28/2011

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Wildebeest Implementation
    7.7/103,858 votes

    #22 - The Wildebeest Implementation

    Season 4 Episode 22 - Aired 5/5/2011

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Engagement Reaction
    8.0/103,928 votes

    #23 - The Engagement Reaction

    Season 4 Episode 23 - Aired 5/12/2011

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

    Director: Howard Murray

    Writer: N/A

  • The Roommate Transmogrification
    8.5/104,174 votes

    #24 - The Roommate Transmogrification

    Season 4 Episode 24 - Aired 5/19/2011

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

    Director: Mark Cendrowski

    Writer: N/A