- 8.7/104,979 votes8.7/10(4,979)
#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
- 8.3/104,462 votes8.3/10(4,462)
#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
- 7.9/104,223 votes7.9/10(4,223)
#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
- 8.0/104,200 votes8.0/10(4,200)
#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
- 7.6/104,042 votes7.6/10(4,042)
#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
- 8.0/104,109 votes8.0/10(4,109)
#6 - The Irish Pub Formulation
Season 4 Episode 6
Aired 10/28/2010
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- 8.0/104,136 votes8.0/10(4,136)
#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
- 8.1/104,146 votes8.1/10(4,146)
#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
- 8.4/104,339 votes8.4/10(4,339)
#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
- 7.6/104,017 votes7.6/10(4,017)
#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
- 8.6/104,618 votes8.6/10(4,618)
#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
- 7.5/104,015 votes7.5/10(4,015)
#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
- 8.2/104,312 votes8.2/10(4,312)
#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
- 7.7/104,082 votes7.7/10(4,082)
#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
- 7.7/104,032 votes7.7/10(4,032)
#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
- 7.8/103,898 votes7.8/10(3,898)
#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
- 7.9/103,933 votes7.9/10(3,933)
#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
- 8.1/104,114 votes8.1/10(4,114)
#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
- 8.0/103,999 votes8.0/10(3,999)
#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
- 8.2/103,995 votes8.2/10(3,995)
#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
- 8.2/104,101 votes8.2/10(4,101)
#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
- 7.7/103,884 votes7.7/10(3,884)
#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
- 8.0/103,953 votes8.0/10(3,953)
#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
- 8.5/104,203 votes8.5/10(4,203)
#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
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
Episodes
24
Avg. Rating
8.0
S1
S2
S3
S4
E1
E2
E3
8.7
8.3
7.9
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 4979 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".