The Big Bang Theory

10 Best Episodes of The Big Bang Theory - Season 4

The Big Bang Theory, which aired on CBS from 2007 to 2019, is one of the most popular sitcoms of all time. The show centers on five characters living in Pasadena, California and features the geekiness and intellect of Leonard Hofstadter, Sheldon Cooper, Howard Wolowitz and Raj Koothrappali contrasted with the common sense and social skills of Penny. With 13 seasons of content, fans have plenty of episodes to choose from. Here we will rank the best episodes of The Big Bang Theory and discuss why they are so popular.

The Big Bang Theory is renowned for its clever writing and witty dialogue. The show explores a variety of topics, ranging from relationships and romance to science and technology. It also features a number of recurring jokes and cultural references. All of these elements combine to make The Big Bang Theory an entertaining and memorable show.

Given the show’s long run, it’s no surprise that it has featured some truly outstanding episodes over the years. In this article, we’ll be taking a look at some of the best episodes of The Big Bang Theory and discussing why they are so highly ranked. From heartfelt moments to laugh-out-loud comedy, these episodes are sure to please any fan of the show.

Written by Sophie and last updated on jul 14, 2024.

PS: The following content contains spoilers!

PPS: I will admit that parts of this page was written with the help of AI - it makes my work so much easier to not start from a blank page!

The Big Bang Theory - S4E15

#15 - The Benefactor Factor (Season 4 - Episode 15)

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

The episode was rated 8.01 from 2596 votes.

The Big Bang Theory - S4E8

#14 - The 21-Second Excitation (Season 4 - Episode 8)


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

The episode was rated 8.01 from 2771 votes.

The Big Bang Theory - S4E17

#13 - The Toast Derivation (Season 4 - Episode 17)

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

The episode was rated 8.03 from 2661 votes.

The Big Bang Theory - S4E2

#12 - The Cruciferous Vegetable Amplification (Season 4 - Episode 2)


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

The episode was rated 8.03 from 3012 votes.

The Big Bang Theory - S4E22

#11 - The Wildebeest Implementation (Season 4 - Episode 22)

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

The episode was rated 8.05 from 2686 votes.

The Big Bang Theory - S4E13

#10 - The Love Car Displacement (Season 4 - Episode 13)


When the gang road trips to a conference, tensions run high when Bernadette runs into her ex-boyfriend.

The episode was rated 8.07 from 2708 votes.

The Big Bang Theory - S4E1

#9 - The Robotic Manipulation (Season 4 - Episode 1)

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

The episode was rated 8.08 from 3128 votes.

The Big Bang Theory - S4E19

#8 - The Zarnecki Incursion (Season 4 - Episode 19)


The guys go all out to help Sheldon find the person responsible for hacking his online gaming account, while the girls' hatred for Priya increases.

The episode was rated 8.10 from 2691 votes.

The Big Bang Theory - S4E21

#7 - The Agreement Dissection (Season 4 - Episode 21)

The Big Bang Theory episode "The Agreement Dissection" follows the gang as they try to figure out a loophole in the roommate agreement that Priya has found to throw Sheldon out for the night. After Penny, Amy, and Bernadette take him to a nightclub, they come up with a plan to turn the tables on Priya.

Fans of the show love this episode for its hilarity, especially the Chuck Lorre card at the end. Sheldon comes up with a clever plan to outsmart Priya, showing that playing dirty can win. The audience also can't help but laugh at the spoiler moment when Sheldon's plan is revealed.

The episode was rated 8.12 from 2726 votes.

The Big Bang Theory - S4E9

#6 - The Boyfriend Complexity (Season 4 - Episode 9)


In the episode, "The Boyfriend Complexity" of the popular show, "The Big Bang Theory," Penny finds herself in a difficult situation, and turns to Leonard for help. She needs him to lie to her father about her relationship status, and Leonard is unsure of how to handle it. In the meantime, Howard, Raj, and Bernadette spend the night at a telescope, attempting to observe a supernova.

The episode brings a lot of comedic moments, but also touches on some deeper issues. It addresses Penny's fear of letting her father know that she is not in the relationship she told him she was in, and the complexity of Leonard's dilemma. It also explores the importance of friendship, as Howard, Raj, and Bernadette put their own research on hold to support Penny. With its combination of humor and heartfelt moments, "The Boyfriend Complexity" is sure to please fans of the show.

The episode was rated 8.12 from 2819 votes.

The Big Bang Theory - S4E23

#5 - The Engagement Reaction (Season 4 - Episode 23)

In this episode of The Big Bang Theory, Howard finally tells his mother that he is engaged to Bernadette, but the news lands her in the hospital. Raj provides the comedic relief with his sassy jokes and comments on cards. His delivery of the lines was done exceptionally well, making the audience laugh out loud. Another comedic moment was when Sheldon was at the hospital, with a guy coughing on the stretcher and the biohazard room. It was a hilarious scene that left the audience in stitches.

Raj's sassiness in this episode was well received by the audience, and he was the highlight of the episode. His jokes and comments on cards had the audience in fits of laughter. Sheldon at the hospital was also a great moment, with the guy coughing on the stretcher and the biohazard room. His facial expressions and gestures made the scene even more hilarious. All in all, this episode was full of laughs and provided a great source of entertainment for the audience.

The episode was rated 8.12 from 2583 votes.

The Big Bang Theory - S4E11

#4 - The Justice League Recombination (Season 4 - Episode 11)


In episode of “The Big Bang Theory” titled "The Justice League Recombination", the guys come up with a creative use for Penny’s new boyfriend, Zack, when they decide to enter a costume contest as the Justice League. Leonard, Sheldon, Howard, and Raj enlist Zack’s help in order to complete their superhero team. Zack is more than happy to join in on the fun, and the guys make sure that Penny’s new boyfriend fits in perfectly.

The highlight of the episode was when the guys dressed up in their superhero costumes, and Zack made a grand entrance as Superman. Penny couldn’t help but be a proud girlfriend, and the audience erupted in laughter. This scene was memorable, and it was even more hilarious when Leonard and Sheldon started to argue over who gets to be Batman. This episode was full of comedic moments, and it was one of the funniest episodes in the series.

The episode was rated 8.14 from 2832 votes.

The Big Bang Theory - S4E20

#3 - The Herb Garden Germination (Season 4 - Episode 20)

In the episode "The Herb Garden Germination" of The Big Bang Theory, Sheldon and Amy decide to start several rumors about the others as a test. Meanwhile, Howard takes his relationship with Bernadette to an even higher level. This episode is full of hilarious moments as Sheldon and Amy's schemes unfold.

The conclusion of the episode is somewhat baffling, given the contrast between Howard's childish personality and Bernadette's more mature and hardworking nature. Despite this, the episode is full of laughs and entertainment as viewers watch the two couple's relationship dynamics play out.

The episode was rated 8.16 from 2704 votes.

The Big Bang Theory - S4E18

#2 - The Prestidigitation Approximation (Season 4 - Episode 18)


In the episode of The Big Bang Theory entitled "The Prestidigitation Approximation," Sheldon is amazed and confused by Wolowitz's magic trick that he cannot figure out. Meanwhile, Leonard realizes that by dating Priya, it may make it difficult to remain friends with Penny. This causes tension among the group of friends as Leonard tries to balance his new relationship and his old ones.

The Big Bang Theory fans have a gripe with this episode as they feel that Penny should have been included in the group, regardless of Leonard's dating situation. While it's understandable that Leonard would want to maintain a certain level of balance between his relationships, it's clear that Penny is an important part of the group and should not be excluded. This episode raises interesting questions about how to maintain relationships when life changes, and how to make sure everyone is included and respected.

The episode was rated 8.18 from 2775 votes.

The Big Bang Theory - S4E24

#1 - The Roommate Transmogrification (Season 4 - Episode 24)

In this episode of The Big Bang Theory, Bernadette receives her PhD, which leads to Wolowitz feeling emasculated. In order to cheer him up, Raj and Leonard decide to switch apartments. This leads to a number of surprising events, including Penny doing something she regrets.

The viewers were pleasantly surprised by the events that unfolded in this episode. Raj finally got some love, and Bernadette and Priya were able to put their respective men in their places. This episode of The Big Bang Theory was definitely an enjoyable and fun watch.

The episode was rated 8.30 from 2726 votes.

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