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The fourth season of the American sitcom The Big Bang Theory, began airing on CBS on September 23, 2010.[1] Season four started four months after the end of season 3.

The Big Bang Theory (season 4)
The Big Bang Theory Season 4.jpg
Fourth season DVD cover art
Country of originUnited States
No. of episodes24
Original networkCBS
Original releaseSeptember 23, 2010 (2010-09-23) –
May 19, 2011 (2011-05-19)
Season chronology
← Previous
Season 3
Next →
Season 5
List of The Big Bang Theory episodes

Melissa Rauch and Mayim Bialik were upgraded to the main cast during the fourth season as Dr. Bernadette Rostenkowski and Dr. Amy Farrah Fowler. Johnny Galecki submitted the episode "The Benefactor Factor" for consideration due to his nomination for the Primetime Emmy Award for Outstanding Lead Actor in a Comedy Series at the 63rd Primetime Emmy Awards. Jim Parsons won the Primetime Emmy Award for Outstanding Lead Actor in a Comedy Series at the 63rd Primetime Emmy Awards for the episode "The Agreement Dissection".



Penny dates a couple of guys including the dense Zack who likes the "science dudes", Sheldon begins a platonic relationship with Amy, Howard reconnects with Bernadette eventually asking her to marry him, Leonard begins to date Raj's sister Priya, Penny becomes friends with Amy and expresses regret at breaking up with Leonard.


During the season, actress Kaley Cuoco was absent from two episodes after she fell off a horse and the horse accidentally crushed her leg. When she returned to the series, she was shown working as a bartender instead of waitressing at her usual workplace, The Cheesecake Factory, to hide her injury. In January 2011, The Big Bang Theory was renewed for an additional three years; extending it through the 2013/14 season, for a fifth, sixth, and seventh season.



No. in
TitleDirected byWritten byOriginal air dateProd.
US viewers
641"The Robotic Manipulation"Mark CendrowskiStory by : Chuck Lorre & Lee Aronsohn & Dave Goetsch
Teleplay by : Steven Molaro & Eric Kaplan & Steve Holland
September 23, 2010 (2010-09-23)3X665114.04[2]

Howard demonstrates a robotic arm, by unpacking dinner. Back at home, using the arm as a massager, he thinks he could use it to masturbate, but things go wrong and he calls Leonard and Raj for help. They take him to the hospital, along with the arm and Howard's laptop that controls it, where the nurse immediately turns off the laptop, solving the problem. Later, Leonard gets another call from Howard, saying it "happened again". Meanwhile, Penny comes to know of Sheldon's new friend Amy and is shocked when Sheldon announces his plan to conceive a child with Amy via IVF. Penny suggests that he should first go out on a date with Amy, but, since Sheldon cannot drive, Penny ends up giving him a ride and eating with them. Penny tries to get Sheldon and Amy having a proper conversation, but this becomes all about Penny's dating history and sexual partners. After Sheldon and Penny return home, Penny, who is still upset, threatens to tell his mother about his procreation plans, causing him to drop them.

Title reference: Howard's use of a robotic arm for masturbation.
652"The Cruciferous Vegetable Amplification"Mark CendrowskiStory by : Bill Prady & Lee Aronsohn & Steve Holland
Teleplay by : Chuck Lorre & Steven Molaro & Jim Reynolds
September 30, 2010 (2010-09-30)3X665213.05[3]

Sheldon's estimate for his life expectancy leads him to the conclusion that he will miss by only a few years, when man will be able to transfer his consciousness into machines and achieve immortality". He therefore changes his diet on Thursdays and decides to go jogging with Penny in the mornings in hopes of extending his life expectancy. Due to the diet of cruciferous vegetables he tumbles down the stairs while going down for his jog, Sheldon builds a robotic replication of himself which he calls a "Mobile Virtual Presence Device" that would go through all the hazards of life that Sheldon would otherwise have to endure, while he stays behind in a "secure, undisclosed location" (his bedroom). The guys dismiss the MVPD as a stunt (Penny calls it Shel-Bot). Leonard then goes over to Sheldon's room to convince him to drop the idea, but Sheldon refuses to listen to him and proceeds to cite Section 74C of the Roommate Agreement requiring Leonard to assist him (by providing him transportation) "in the event one of the roommates becomes a robot". Leonard reluctantly takes the MVPD to work, completely regretting it after the MVPD continuously irritates him during the drive. Later Leonard takes the MVPD to dinner. Sheldon, from his bedroom, spots Steve Wozniak having dinner there and sends the MVPD over to his table. Wozniak says that if Sheldon had the Apple II there he would sign it. Sheldon then takes the Apple II and rushes out of his apartment, but trips and falls down the stairs, breaking the Apple II and his ankle. The episode ends with a now bedridden Sheldon using the MVPD to force Penny to sing to him.

Title reference: The cruciferous vegetables that Sheldon adds to his diet which give him a major case of flatulence.
663"The Zazzy Substitution"Mark CendrowskiStory by : Chuck Lorre & Bill Prady & Jim Reynolds
Teleplay by : Lee Aronsohn & Steven Molaro & Maria Ferrari
October 7, 2010 (2010-10-07)3X665312.59[4]

Sheldon and Amy are very compatible with each other, as evidenced by how well they can play "counter-factuals", a game they invented requiring them to know what the other is thinking when answering a question about "an alternate world that differs from ours in one key aspect". Leonard fails miserably when he attempts to play the game. However, Amy's presence does not go down well with the other guys, who already find it difficult to handle Sheldon himself, and they start hanging out at Penny's apartment to escape "ShAmy" (the name the guys and Penny gave for the couple). But one day at lunch, Amy belittles Sheldon's occupation as a theoretical physicist relative to, in her opinion, her superior occupation of neurobiology, prompting Sheldon to terminate their relationship. Following the breakup (or according to Sheldon, "our friendship outlived its utility"), Sheldon adopts 25 cats as a substitute for Amy. A worried Leonard calls Sheldon's mother, who rushes over to the apartment. She calls over Amy and she makes Sheldon offer to reconcile with Amy, which she agrees to after a negotiation on the amount of responsibility Sheldon has to accept for the breakup. The episode ends with Sheldon and Amy giving away $20 to anybody willing to adopt a cat.

Title reference: Sheldon describes one of his cats as being very "zazzy", and he uses his cats to fill the void created by the breakup with Amy.
674"The Hot Troll Deviation"Mark CendrowskiStory by : Chuck Lorre & Steven Molaro & Adam Faberman
Teleplay by : Bill Prady & Lee Aronsohn & Maria Ferrari
October 14, 2010 (2010-10-14)3X665412.57[5]

The guys run into Howard's ex-girlfriend Bernadette while having dinner at the Cheesecake Factory. Though Howard hides under the table when he sees Bernadette, the incident nonetheless reignites his feelings for her. He seeks help from Penny, who agrees on the condition that he reveal the reason behind his breakup. Howard and Bernadette later meet at the Cheesecake Factory and after Howard reveals the reason he indulged in cybersex, believing at the time that Bernadette was not interested in having sex with him, they make amends and decide to give their relationship another try. They go out on a date. Meanwhile, Sheldon and Raj argue over the latter wanting a desk in their office, with Sheldon citing budgetary reasons (saving money) for not providing a desk. Raj offers to buy his own desk, to which he reluctantly agrees. When he enters his office later, he sees Raj sitting on a huge and ornate desk which takes up half the office space. After Raj refuses to obey Sheldon's subsequent order that he remove the desk, a series of annoying confrontations ensues between the two. Eventually, Sheldon drives Raj out of their office. However, this makes the stink bomb vapors ignite, causing an explosion, after which Raj vows revenge.

Title reference: Howard's online affair in World of Warcraft with a female troll.
685"The Desperation Emanation"Mark CendrowskiStory by : Bill Prady & Lee Aronsohn & Dave Goetsch
Teleplay by : Chuck Lorre & Steven Molaro & Steve Holland
October 21, 2010 (2010-10-21)3X665513.05[6]

When Amy decides to introduce Sheldon to her mother, he becomes worried as being introduced to Amy's mother would indicate that Amy wants to be his girlfriend, which he is not ready for. So he begins to avoid Amy, removing all possible contact with her and even disguising himself so that she would not recognize him. However Amy catches Sheldon outside the apartment building and then calms him down, assuring him that she only wants to introduce him to her mother so that she would be convinced that Amy is in a relationship and leave her alone. Later when talking to Amy's mother, a now relieved Sheldon and Amy lie to Amy's mother that they are in a "sexual relationship", which does not go too well with her. Meanwhile, as Howard now has a girlfriend, Leonard decides to invoke the "Girlfriend Pact" (from the Season 3 episode The Creepy Candy Coating Corollary) with Howard. Howard and Bernadette set up a double date with Leonard and one of Bernadette's friends, Joy. Joy behaves in an obnoxious and inappropriate manner during the date, which disgusts Leonard. However he later accepts another date with Joy due to understanding that sex is a strong possibility.

Title reference: Leonard's desperation in wanting a girlfriend.
696"The Irish Pub Formulation"Mark CendrowskiStory by : Chuck Lorre & Lee Aronsohn & Steven Molaro
Teleplay by : Bill Prady & Eric Kaplan & Maria Ferrari
October 28, 2010 (2010-10-28)3X665613.04[7]

Raj's younger sister Priya, a lawyer by profession, visits Pasadena. Though unknown to the others including Raj, Priya had been involved in a sexual encounter with Leonard five years earlier, despite Leonard's assurance to Howard that he would never hit on Priya in deference to Raj. That night, Priya sneaks into Leonard and Sheldon's apartment unknown to Sheldon and has sex with Leonard. Sheldon finds out the following morning and frames an elaborate, flawless lie to cover it up, which involves Leonard having had sex with an imaginary bartender named Maggie McGeary. But Leonard decides not to hide the truth and confesses to Raj that he slept with Priya. Raj is initially upset, but reconciles with Leonard after he says that Priya broke his heart. The guys then unleash confessions of all of the deceptions they have perpetrated on each other, including Howard dropping Raj's iPhone into a urinal, Sheldon's experiment feeding moth parts to Leonard mixed in his food and Raj using Sheldon's toothbrush. Sheldon becomes upset at Raj for using his toothbrush and nearly ends his friendship with him.

Title reference: The Irish pub that Sheldon included in the details of the lie to cover up Leonard's sleeping with Priya.
707"The Apology Insufficiency"Mark CendrowskiStory by : Chuck Lorre & Lee Aronsohn & Maria Ferrari
Teleplay by : Bill Prady & Steven Molaro & Steve Holland
November 4, 2010 (2010-11-04)3X665714.00[8]

the FBI sends Agent Angela Paige to interview Leonard, Sheldon and Raj in order to do a background check on him. The interviews do not go well. As a result, Howard is denied clearance. Sheldon feels guilty that he caused Howard's career to be set back and sets out to put things right. He apologizes to Howard, but Howard refuses to accept it. Later, Penny inspires Sheldon to modify Howard's thoughts so that he will accept his apology. When that does not work, Sheldon offers Howard his spot on the couch, and Howard is so touched by this gesture he forgives Sheldon. But, that evening, Sheldon takes back his spot after only 94 seconds, and Penny wins her bet with Leonard.

Title reference: Howard's refusal to accept Sheldon's apology.
718"The 21-Second Excitation"Mark CendrowskiStory by : Chuck Lorre & Bill Prady & Jim Reynolds
Teleplay by : Lee Aronsohn & Steven Molaro & Steve Holland
November 11, 2010 (2010-11-11)3X665813.11[9]

The guys decide to go to a special midnight screening which has 21 seconds of unseen footage. However when they arrive at the theater, they are made to wait in a long queue, making Sheldon whine about how Leonard, Howard and Raj wasted time by having dinner. Later Wil Wheaton arrives and is immediately allowed entry without having to stand in a queue due to his celebrity status, which angers an already-impatient Sheldon. Eventually the guys are barred from watching the movie as the theatre is fully occupied. Just as the four are about to leave, Sheldon discovers a side door and enters it. Leonard, Howard and Raj follow Sheldon and find him holding some film cans, having stolen the reels of the movie in retribution for being denied from watching the movie. Wheaton too finds Sheldon holding the movie reels, leading to a mob of angry Raiders (and Wheaton) chasing the four from the theater, mimicking the opening scene of Raiders of the Lost Ark. Meanwhile, Amy decides to spend the evening with Penny and Bernadette, who are planning a "girls' night", despite her initially planning to go with the guys to Raiders of the Lost Ark. As Amy had never been to a girls' night before, she grosses out Penny and Bernadette, which Penny and Bernadette reluctantly go along with. Amy and Bernadette get on Penny's case about Leonard. Annoyed, Penny storms off to her bedroom. Later, Amy enters Penny's bedroom. This puzzles Bernadette, who would rather eat raw cookie dough.

Title reference: Sheldon, Leonard, Raj, and Howard are excited to see a print of Raiders of the Lost Ark, which includes 21 seconds of never-before-released footage.
729"The Boyfriend Complexity"Mark CendrowskiStory by : Chuck Lorre & Lee Aronsohn & Jim Reynolds
Teleplay by : Bill Prady & Steven Molaro & Dave Goetsch
November 18, 2010 (2010-11-18)3X665913.02[10]

Penny informs Leonard that her father Wyatt has come on a visit and asks him to pretend that they are back together as he is the only boyfriend she had that her father ever approved of. He is initially wary of the idea, but gleefully plays along to get her to confess (he also calls her out on her hypocrisy at being mad at him for going along with her stupid, flawed plan). Penny's father confronts her about the hoax and admonishes her for always being dishonest to him. After Penny goes to her room, her father pleads with Leonard to get back together with her because he does not want her to go back to dating boyfriends whose personalities he does not approve of and wants grandchildren. Leonard agrees to try and then plays along as Wyatt pretends to angrily throw him out of Penny's apartment. Meanwhile, Raj becomes angry when Howard invites Bernadette until he discovers that Bernadette brought wine. A drunk Raj complains that no girl wants to kiss him, to which Bernadette shows sympathy for him. At this, Raj attempts to kiss her, but ends up kissing Howard when he attempts to stop Raj from kissing his girlfriend. The next day, Howard and Raj act awkward around each other and lash out at Leonard and Sheldon when they inquire about what they had seen on the telescope. Elsewhere, Sheldon thinks that Leonard and Penny have got back together, unaware they are faking it. So he modifies the Roommate Agreement to include a Penny-specific section which addresses some of Penny's annoying habits, which if she does while at their apartment, would cause Leonard to pay a fine to Sheldon. When Leonard tells him later that he and Penny "broke up" again, a frustrated Sheldon throws the agreement papers into the air and yells whether Leonard even thinks of other people.

Title reference: Leonard pretending to be Penny's boyfriend to please her father.
7310"The Alien Parasite Hypothesis"Mark CendrowskiStory by : Chuck Lorre & Steven Molaro & Steve Holland
Teleplay by : Lee Aronsohn & Jim Reynolds & Maria Ferrari
December 9, 2010 (2010-12-09)3X666012.03[11]

While on a girls' night out with Penny and Bernadette, Amy meets Penny's ex-boyfriend Zack and immediately becomes attracted to him. She later discusses her symptoms with Sheldon (elevated heart rate, moist palms, dry mouth and saying an involuntary "hoo" in Zack's presence) though Sheldon prefers to assume that Amy has contracted an alien parasite. Amy also points out that Sheldon might be jealous, which Sheldon denies, but doesn't confirm whether he is actually suppressing it when Amy asks him. Later when Sheldon discusses about Amy and Zack with Penny, Penny tells him that there is "something" he could do about Amy's "urges", but as usual he misunderstands what Penny is trying to say to him (Penny meant that Sheldon should show romantic feelings to Amy) and instead tries to bring Amy and Zack together, believing Zack is sexually superior to him. He manages to contact the right Zack Johnson and sets him up on a date with Amy at a bar. This proves to be a failure, as Amy finds out that Zack is extremely stupid, which turns her off. Later while walking home with Sheldon, Amy does something she never did before - she holds Sheldon's hand. When Sheldon asks why Amy is holding his hand, Amy says it is just an experiment, but then lets go and says, "Nope. Nothing. Never mind.", indicating that she is not attracted by Sheldon's appearance, yet chose Sheldon's intellect over Zack's looks. Meanwhile, after one of the scientists at the biology lab is bitten by a radioactive rat, Howard and Raj argue about who would be the better (with Raj expressing his desire to be "Rat-Man"). Knowing that Raj is afraid of spiders, Howard proposes a contest where the first person who dares to put his hand into a jar with a huge spider in it and keeps it there for the longest time gets to be the superhero. This however backfires, as the spider crawls onto Howard's arm, freaking him out. The duo decide to settle their argument once and for all with Leonard mediating them, but this too fails as instead of wrestling each other, they only end up circling and insulting each other for hours, while Leonard falls asleep.

Title reference: One of Sheldon's theories about why Amy had her symptoms, which he thinks is more likely than her being sexually aroused.
7411"The Justice League Recombination"Mark CendrowskiStory by : Chuck Lorre & Lee Aronsohn & Maria Ferrari
Teleplay by : Bill Prady & Steven Molaro & Steve Holland
December 16, 2010 (2010-12-16)3X666113.24[12]

Penny gets back together with Zack. The guys insult Zack's low intelligence which upsets him; however he reconciles with the four and he accompanies them to the comic book store. Sheldon forces Penny to wear a black wig, as Wonder Woman has black hair, but Penny refuses to wear the wig and decides not to come to the costume party. Sheldon, Howard and even Zack are unable to convince Penny to change her mind. Later when Leonard talks to her in an attempt to convince her to come to the party, Penny reveals that she got back together with Zack only because she did not want to spend New Year's Eve alone. Leonard questions why not with him, prompting Penny to suddenly remember the fun times she used to have with him, convincing her to change her mind and put on the wig. At the comic book store, the group win the award for the Best Group Costume, although it is hinted that they only won because they showed up with a girl. The episode concludes with the six witnessing an ongoing car theft and then scurrying off cowardly despite wearing Justice League costumes.

Title reference: Sheldon, Leonard, Howard and Raj inviting Penny and Zack to be Wonder Woman and Superman in their Justice League team.
7512"The Bus Pants Utilization"Mark CendrowskiStory by : Chuck Lorre & Lee Aronsohn & Maria Ferrari
Teleplay by : Bill Prady & Steven Molaro & Eric Kaplan
January 6, 2011 (2011-01-06)3X666213.98[13]

Leonard gets an idea. However, Sheldon catches the heat from Leonard when he tries to put himself in charge despite the app being Leonard's idea (Sheldon had named himself as the chief officers among other high-rank positions while listing Leonard as only the founder). Despite eventually acknowledging Leonard as the leader of the project, Sheldon continually criticizes Leonard's leadership in the development of the app. After Sheldon suggests names for the app that have his name in it (the "Surprisingly Helpful Equation-Linked Differential Optimized Numerator", which has "Sheldon" as its acronym, and "Project NodlehS", which has "Sheldon" spelled backwards), Leonard tells him to stop. Sheldon abruptly calls for a vote to change the team's leadership, resulting in Leonard kicking Sheldon off the team. After unsuccessfully trying to bribe Howard and Raj to dump Leonard and join his "rival company", Sheldon resorts to sabotaging Leonard's project, and Leonard kicks him out of the apartment in retaliation. When Penny sees Sheldon moping on the stairs, she sympathetically invites him to her apartment for a cup of cocoa, but quickly regrets her decision. She asks the guys to take Sheldon back, promising that he will apologize. Sheldon initially refuses to apologize, so Penny tells him to use sarcasm to disguise his lack of sincerity, an idea to which Sheldon immediately takes a liking. The guys agree to put him back on the team, but Sheldon quickly goes back to criticizing their work, demanding that they completely start over. The episode ends with Sheldon, having been kicked off the team again, reluctantly working with Penny on an app she mentioned to him while sitting on the stairs - the app identifies shoes and finds out where to buy them.

Title reference: A pair of pants that Sheldon wears when riding on buses to protect his regular pants from dirty bus seats.
7613"The Love Car Displacement"Anthony RichStory by : Chuck Lorre & Bill Prady & Dave Goetsch
Teleplay by : Lee Aronsohn & Steven Molaro & Steve Holland
January 20, 2011 (2011-01-20)3X666313.63[14]

Amy asks Penny to join her, Bernadette and the other guys on a trip to a science conference, as she believes them to be her best friends. At first she rejects the offer, but then accepts after learning about the free spa treatment. Before they leave, "travel supervisor" Sheldon explains the timetable and seating arrangements. Amy convinces Sheldon to let Penny ride in the lead car with themselves and Leonard because her "Nebraska backwoods skills" could help them if their car breaks down. During the trip, Penny gets sent to the second car with Howard, Raj and Bernadette after she attempts to stand up to Sheldon. At the hotel, Bernadette spots Glenn, her professor at college and ex-boyfriend, a tall handsome guy who intimidates Howard. When Howard confronts Bernadette over Glenn, she gets mad at him and decides to stay with Amy and Penny. Since there are only two beds and Penny cannot sleep because of Amy's nightmares, which cause her to bite, Penny moves out of her room and asks Leonard if she can stay with him and Sheldon. Leonard accepts, but after Penny tells him that they aren't going to have sex, Sheldon wakes up, asking them if they are not going to have "coitus". As he receives different answers (Penny says "yes", Leonard says "no"), Sheldon leaves and seeks shelter in Raj's room. Sheldon eventually kicks out Raj, who then goes to Leonard and Penny's room, just when they are about to have sex. He crawls into the bed vacated by Sheldon, stopping Leonard and Penny from having sex. The next morning as Sheldon, Leonard, Howard, Raj, Bernadette and Amy sit on a panel, with Penny in the audience, they all exchange initially thinly veiled yet increasingly angry criticisms at one another stemming from the previous night's events. An irritated Penny then accepts a ride back to Pasadena with Glenn, much to Leonard's horror. Later while returning home, Leonard gets pursued by the police for speeding as he is distracted by the thought of Penny being with Glenn.

Title reference: The car in which Howard, Bernadette and Raj were riding and is reminiscent of The Love Boat with their bed swapping plot.
7714"The Thespian Catalyst"Mark CendrowskiStory by : Chuck Lorre & Lee Aronsohn & Jim Reynolds
Teleplay by : Bill Prady & Steven Molaro & Maria Ferrari
February 3, 2011 (2011-02-03)3X666413.83[15]

Sheldon guest lectures at a university, but his teaching style is considered boring and intolerable, and results in negative online feedback from his students. On Amy's advice, he decides to take acting lessons from Penny for $40 to learn how to more easily communicate with his students, though his attitude during the lessons frustrates Penny. Finally, they act out a Star Trek fanfiction script which Sheldon wrote in his childhood. Penny plays the role of Spock as she feels that Sheldon needs to come out of his comfort zone, while Sheldon plays the dual role of himself and his mother. However while acting out the script, Sheldon immerses himself so deeply in the part that he is brought to tears, because he does not want to be taken away from his mother by Spock. Penny then calls his mother and gives the phone to Sheldon so that his mother can console him.

Title reference: Sheldon getting Penny to give him acting lessons so he can become a better teacher.
7815"The Benefactor Factor"Mark CendrowskiStory by : Bill Prady & Lee Aronsohn & Dave Goetsch
Teleplay by : Chuck Lorre & Eric Kaplan & Steve Holland
February 10, 2011 (2011-02-10)3X666512.79[16]

President Siebert invites the guys to Caltech that Saturday. While Leonard, Howard and Raj are willing to attend, Sheldon refuses to go and stays back in the apartment; however, he changes his mind after a video chat with Amy, who tells him that if he is not at the fundraiser, the task of raising funds for the physics department would fall to Leonard and Raj, whom, according to her, would probably fail in raising funds, as a result of which the funds would go to departments like; but during the fundraiser, he insults many donors by refusing to shake hands with them as a result of which the physics department loses potential donors. At the fundraiser, the guys are introduced to Mrs. Latham, whose condescending attitude terrifies them, but she later tells Leonard that she likes making smart people nervous. She then invites Leonard to dinner the following night to talk more about his research, despite none of the guys, including Leonard, feeling like they did anything right at the fundraiser. During dinner, she reveals that she is willing to donate money to the physics department on one condition - Leonard must have sex with her. Leonard is not comfortable with this and is unwilling to, despite Sheldon's plea that he do it for the physics department. The next night, Leonard again has dinner with Mrs. Latham, during which she tells Leonard that whether he has sex with her or not, she will donate to the physics department. After this, she eventually causes him to give in and have sex with her. The next morning, Penny and Sheldon catch him as he arrives home and tease him slightly. Later at work, he is applauded by everyone at Caltech, including Howard, Raj and President Siebert which brought funds to the physics department.

Title reference: Mrs. Latham, a woman Leonard has sex with so that she will donate money to the university.
7916"The Cohabitation Formulation"Mark CendrowskiStory by : Chuck Lorre & Lee Aronsohn & Dave Goetsch
Teleplay by : Bill Prady & Steven Molaro & Jim Reynolds
February 17, 2011 (2011-02-17)3X666612.41[17]

Bernadette is upset because Howard always goes home after sex so that he can help his mother in the morning. She insists that Howard moves in with her, which Howard is not interested in until he has a big fight with his mother after reaching home regarding his sexual activity with Bernadette. After spending the rest of the night in Leonard and Sheldon's apartment, Howard moves out of his house to Bernadette's apartment. Both are happy initially, but later Bernadette realises that Howard is too dependent on his mother and insists that he should not expect the same treatment from her. As a result, Howard returns home, where his mother, did not know that Howard had moved out. Meanwhile, after Howard offhandedly mentions that Raj's younger sister Priya has come to Pasadena and is staying at Raj's apartment, Leonard rushes over there to talk to her. Leonard and Priya then decide to pursue a long-term relationship much to Raj's indignance, who even quotes to dissuade Priya from dating Leonard, only for Priya to remind him that he eats beef which is also forbidden in the Manusmriti. Amy, rushes over to Penny's apartment to console her when she hears the news, but Penny insists that she is not upset that Leonard and Priya are dating. Later while having dinner, Penny finds out that Priya, being a lawyer, is much more successful than her and also sees that Leonard, and even Amy, is crazy about Priya's achievements. After returning to her apartment following dinner, Penny breaks down crying, which confirms that she still has feelings for Leonard. Amy, who is also in Penny's apartment, comforts her before using electrodes to determine which brain regions are active during crying. During the weekend, with Leonard and Priya having gone, Howard grounded by his mother and Raj at home in strong disapproval of Leonard and Priya dating, Penny spends her time with Sheldon and Amy (via webcam), who tells her that thanks to her contribution, she was successfully able to make a rhesus monkey cry, and then convinces Sheldon to comfort Penny by making tea.

Title reference: Howard deciding to live with Bernadette.
8017"The Toast Derivation"Mark CendrowskiStory by : Bill Prady & Dave Goetsch & Maria Ferrari
Teleplay by : Chuck Lorre & Steven Molaro & Jim Reynolds
February 24, 2011 (2011-02-24)3X666712.35[18]

Now Leonard and Priya are dating and since she lives with Raj, Leonard and Howard decide to have dinner there instead of the normal venue which disturbs Sheldon who prefers their place. Sheldon leaves and stops by the Cheesecake Factory where Penny tells him he has to accept that the gang will be hanging out at Raj's place more often. Amy tells him that Leonard is the nucleus of their social group and not Sheldon. As a result, he sets up a new group consisting of Kripke, Stuart, Zack and LeVar Burton (whom he tweeted) with him as the nucleus. Sheldon's plans are dismissed by the others in favor of Zack's dating stories and getting drunk and singing karaoke. Naturally, Sheldon does not like that very much, so he decides to go back to his old friends, who, in the meantime, realized that they actually missed Sheldon. In the end, LeVar Burton finally does show up at Sheldon's place, but when he sees Kripke, Stuart and Zack singing karaoke together, he leaves immediately, stating "I am so done with Twitter". Meanwhile, Bernadette and Amy want to take Penny out dancing to get her mind off of Leonard and Priya. As she changes clothes, she tells the girls that it is the first time in her life she is satisfied with being single and does not want to have sex with a random guy to make up for it, however when Amy finds the snowflake that Leonard gave to her after his expedition, she changes her mind as her feelings for Leonard come back to the surface again.

Title reference: The group reminiscing about Sheldon explaining the origin of making a toast to them.
8118"The Prestidigitation Approximation"Mark CendrowskiStory by : Bill Prady & Steve Holland & Eddie Gorodetsky
Teleplay by : Chuck Lorre & Steven Molaro & Eric Kaplan
March 10, 2011 (2011-03-10)3X666812.06[19]

Priya has begun to dominate in her relationship with Leonard, buying him new clothes (which Leonard is not comfortable with). She also feels threatened by Leonard continuing to hang out with Penny, even though they have broken up, so during sex, she tells him to break all contact with Penny. Leonard initially hesitates, but still tries to tell Penny to stay away from him, albeit indirectly. Penny does not get the right message, but Leonard takes comfort in the fact that he tried. Later Penny interrupts Leonard's date with Priya and is completely oblivious to what is going on. Leonard once again indirectly tries to tell Penny to stay away from him, but this time Penny gets the message and realizing that Priya was behind this, decides to break all contact with Leonard for the sake of their relationship. Leonard immediately attempts to go after his ex-girlfriend, only to crash into the doorframe due to his uncomfortable new contact lenses. Meanwhile, Howard shows Sheldon, Raj and Penny a card trick in which a volunteer picks a card and after shuffling the deck, Howard tells the volunteer his/her card. Raj and Penny both try out the trick and are amazed by it. Though at first his attitude is dismissive, Sheldon eventually becomes obsessed with discovering the trick's secret, as even Penny could figure it out. He goes to the extent of using a barcode reader in order to recreate the trick. It is then revealed (to the audience) that the card trick is just a prank played by Howard, Raj and Penny on Sheldon. Raj and Penny willingly pretended that Howard was successful, knowing fully well that Sheldon would go nuts trying to figure out the trick's secret. When Sheldon wants Howard to perform the trick on him in the end, Raj manages to get a peek on Sheldon's card and uses hand signals to tell Howard the right answer. Sheldon is puzzled once more, still not knowing that he had been pranked all along, while Howard and Raj both laugh gleefully.

Title reference: Howard's faux prestidigitation magic card trick.
8219"The Zarnecki Incursion"Peter ChakosStory by : Chuck Lorre & Steven Molaro & Maria Ferrari
Teleplay by : Bill Prady & Dave Goetsch & Jim Reynolds
March 31, 2011 (2011-03-31)3X666911.92[20]

Sheldon's World of Warcraft account has been hacked and all of his WoW stuff have been stolen. He enlists the help of the other guys in finding the hacker. Meanwhile, Amy, Bernadette and Penny criticise Priya and her arrogant, dominating behavior. Penny takes Amy's comments lightly, but after an encounter with Priya in the apartment lobby, she agrees with Amy. Howard manages to trace the hacker and reveals that his name is Todd Zarnecki. The guys then drive to Carlsbad to get back Sheldon's WoW stuff. At Todd's home however, not only does Todd refuse to return Sheldon's stuff. Defeated, the guys decide to return home, but their car breaks down midway, prompting Leonard to call Penny to fetch them. When Penny hears their story, she not only realises that Leonard did not want to see Priya that night, but also drives them back to Todd's house where she delivers a kick to Todd's groin and forces him to return Sheldon's stuff.

Title reference: Todd Zarnecki's hacking of Sheldon's World of Warcraft account.
8320"The Herb Garden Germination"Mark CendrowskiStory by : Chuck Lorre & Eric Kaplan & Eddie Gorodetsky
Teleplay by : Bill Prady & Steven Molaro & Steve Holland
April 7, 2011 (2011-04-07)3X667011.40[21]

Penny spreads a rumor that Bernadette is thinking of breaking up with Howard. Amy tells Sheldon, who tells Leonard, who tells Priya, who later tells Raj. Priya informs Leonard that Raj has a crush on Bernadette and even writes poems about her. When Raj hears the rumor from Priya, he gets excited, as he could finally have his own shot with Bernadette. Howard is completely unaware of the rumor and plans to ask Bernadette to marry him. The others try to stop him from asking, as they believe that Bernadette will reject him and he will become blindsided, except Raj, who selfishly encourages Howard to go through with his plan in the hope that Bernadette will reject him. This motivates Amy and Sheldon to conduct an experiment in which they concurrently spread two false rumors: a "tantalizing" one (Sheldon and Amy had sex) and a "non-tantalizing" one (Amy decided to start a herb garden) to see which rumor gets back to them first. Amy starts both rumors by informing Penny and, as expected, the rumor about the two having sex reaches the entire group in under 24 hours while the other one is not mentioned again. When having dinner that night, Howard pulls out the proposal ring, as he cannot imagine a better time to ask her than with all of his friends around. Despite the protest of the others, he gets on his knees and starts to talk. At that moment, Bernadette cuts him off in what appears to be a rejection, however she actually accepts his marriage proposal, devastating Raj. Concluding that their rumor stopped Bernadette from rejecting the proposal, Sheldon and Amy decide to start over with their experiment. Amy visits Penny (who just got a text from Bernadette informing her about the proposal). Moments later Leonard meets Amy in the hall after he receives a text message from Penny, informing him about the false pregnancy. He confronts Amy, who, in return, just wonders "is there anything on there about orthotics?"

Title reference: The mundane false rumor that is part of Amy and Sheldon's experiment.
8421"The Agreement Dissection"Mark CendrowskiStory by : Bill Prady & Dave Goetsch & Eddie Gorodetsky
Teleplay by : Chuck Lorre & Steven Molaro & Eric Kaplan
April 28, 2011 (2011-04-28)3X667110.71[22]

When Leonard takes a shower with Priya, he gets charged with two violations of the roommate agreement: Leonard denied access to the bathroom when Sheldon had to urinate and Leonard was not the only person in the shower. 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, which Sheldon does not like at all, on pizza night, Sheldon seeks shelter at Penny's, who invites him to join her on a girls' night out with Amy and Bernadette badmouthing Priya. After the girls have some cocktails and Sheldon mentions he had learned to dance as a child, they decide to take Sheldon dancing. After dancing, Sheldon takes an intoxicated Amy back to her apartment. Amy tells Sheldon not to give in to Priya's law skills, just like a monkey would defend his territory. She then proceeds to kiss him and then rushes to her bathroom to vomit. The next day, Sheldon presents an overhauled version of the roommate agreement to Leonard and asks him to sign it. When Leonard shows his reluctance, Sheldon activates a "self-destruct sequence" on his laptop; If Leonard does not sign the agreement within a minute, an e-mail will be sent to Priya's parents informing them of their relationship. Leonard accuses Sheldon of bluffing and blackmailing and does not see any harm in Priya's parents knowing. Priya, however, knowing that her parents do not approve her dating an American, tells Leonard their relationship is over if he does not sign the new agreement. After a failed attempt to cut the power supply from Sheldon's laptop, Leonard gives in and Sheldon aborts the program. Later that day, Sheldon speaks with a hungover Amy via webcam and thanks her for the advice that she gave him the night before. They agree to treat their relationship like a "crashed computer" and "restore" it to the last point it worked for both, thus deciding to move forward from the entire evening's events. Meanwhile, Leonard, not knowing how strict Priya's parents are, argues with her about whether or not she is ashamed of him.

Title reference: Priya using her skills as a lawyer to nullify Leonard and Sheldon's roommate agreement.
8522"The Wildebeest Implementation"Mark CendrowskiStory by : Chuck Lorre & Steven Molaro & Eric Kaplan
Teleplay by : Bill Prady & Eddie Gorodetsky & Maria Ferrari
May 5, 2011 (2011-05-05)3X667210.50[23]

While shoe-shopping with Penny and Amy, Bernadette reveals that Howard and her have been invited to a double date by Priya. Amy suspects that Priya is trying to win over the weakest member of their social group. Therefore, she proposes to use Bernadette to spy on Priya and spread disinformation about Penny and Leonard. Bernadette is uncomfortable with lying, as she went to a Catholic school, but nonetheless goes along with the plan. When the four meet for dinner, Priya makes a snide remark about Penny's acting career. Penny and Amy order Bernadette to tell Priya and the others that Penny is on her way to Prague for a movie part and that she is dating an architect. Priya, Leonard and Howard begin to ask questions about this news, being very interested in details about where Penny met the astronaut, to which Bernadette has to improvise answers, increasingly unnerving and frustrating her. Bernadette excuses herself to the bathroom and calls Amy to tell her that the lie and her calm are unraveling. She also reveals that Priya and Leonard are planning a trip to India to meet the Koothrapallis. Consequently, Penny wants her to find out if the two are getting engaged. After Priya confirms that she and Leonard are not getting engaged Bernadette finally snaps and storms out, leaving Priya and Leonard befuddled. Meanwhile, Raj, who is still very lonely, visits Sheldon in his apartment. He tries to get advice about whether or not he should try to cure his social anxiety using an experimental drug, however Sheldon is preoccupied with his project, as he does not only adapt the popular game for 3 players with a new board design, but also adds new chess pieces. Sheldon finally advises Raj to take the drug and accompanies him to a coffee shop to observe the drug's effectiveness. It ends up working very well, as Raj starts to talk to a woman named Angela, who also seems to like him. However, an adverse effect begins to manifest itself, causing Raj to lose all his inhibitions and strip completely naked, thus scaring off Angela and horrifying everyone in the shop including Sheldon. In the end, Sheldon, Leonard and Howard play a test game of Sheldon's chess version, to which he added a multitude of new chess pieces and rules while a still-nude Raj is watching them.

Title reference: Amy's metaphor about Bernadette being a "weak wildebeest".
8623"The Engagement Reaction"Howard MurrayStory by : Bill Prady & Eric Kaplan & Jim Reynolds
Teleplay by : Chuck Lorre & Steven Molaro & Steve Holland
May 12, 2011 (2011-05-12)3X667310.78[24]

While dining at the Cheesecake Factory, Bernadette and Howard reveal that their parents have not been informed about their engagement yet. Howard arranges a lunch for his fiancée and his mother and they end up getting along well. After Howard hears the good news while talking to his mother, who is in the bathroom, he decides to make the move and tell her about the engagement. To his horror, she collapses from an apparent heart attack. Howard takes her to the hospital as fast as he can. When the others hear about this, they rush to the hospital. Sheldon, is initially reluctant to visit the hospital and only agrees to come after Penny pressures him to go. When Bernadette finds out that Howard was telling his mother about his engagement before she collapsed, she is very upset, as she believes that she is the reason all this happened. When Mrs. Wolowitz finally wakes up, the doctor informs them that it had not been a heart attack and that she wants to see Bernadette before anyone else. It is revealed that she actually had food poisoning from the restaurant she and Bernadette ate at and was worried about Bernadette's well-being, whom she actually likes a lot. Bernadette ends up being very mad at Howard, as he led her to believe that it was all her fault. While in the hospital, Priya and Penny start searching for the cafeteria and bond in the process. They mainly discuss Leonard's skills in the bedroom. Sheldon has other things to worry about, as he tries to avoid contact with anything in the hospital and, when he has to go to the restroom, is trapped in there, waiting for someone to open the door for him. When he tries to avoid a coughing patient on the way back, he seeks shelter in a random room. Much to his horror, it turns out to be a bio-hazard room, where he is exposed to a deadly disease. Sheldon is eventually forced to stay in the hospital after the exposure, with his friends keeping him company.

Title reference: Mrs. Wolowitz's reaction to the news of Howard and Bernadette's engagement.
8724"The Roommate Transmogrification"Mark CendrowskiStory by : Chuck Lorre & Steven Molaro & Eddie Gorodetsky
Teleplay by : Bill Prady & Eric Kaplan & Jim Reynolds
May 19, 2011 (2011-05-19)3X667411.30[25]

Bernadette announces her Ph.D. and a well-paid job. Later Bernadette decides to buy Howard an expensive watch as a present and tells him to "let her worry about the money", a comment that disturbs Howard. Meanwhile, Leonard's and Priya's noisy sexual encounters sends Raj to spend the night at Sheldon's apartment. When Leonard finds him in his bed, he proposes that Raj moves in with Sheldon until Priya finds her own place. Raj likes the idea, signs Sheldon's roommate paperwork and moves in with him. He then prepares a fancy dinner for them which delights Sheldon who decides Raj is a much better roommate than Leonard. Penny stops by, stays for dinner and the both of them get drunk from the wine Raj served. Penny confesses to Raj that she "screwed up", as she should not have broken up with Leonard, and that she would be "on" Raj if they were not friends. When Priya receives a video call from her parents, Leonard overhears them saying that she is moving back to India and storms out revealing their relationship to her parents. At the end of the episode, Sheldon discovers Leonard sleeping on their couch, just before Howard shows up and announces that he had a fight with Bernadette over the watch. Penny wakes up and after noticing Raj laying next to her, becomes horrified when she realizes that she hooked up with him. She tells him that last night never happened and tries to sneak out of the apartment; however, they are busted by the others. Penny just states that "it's not what it looks like" and leaves. Sheldon then asks "What does it look like?"

Title reference: Raj becoming Sheldon's new roommate.


No. Title Air date Rating/share
1 "The Robotic Manipulation" September 23, 2010 4.9/16 14.04[2]
2 "The Cruciferous Vegetable Amplification" September 30, 2010 4.4/14 13.06[3]
3 "The Zazzy Substitution" October 7, 2010 4.1/13 12.59[4]
4 "The Hot Troll Deviation" October 14, 2010 4.3/14 12.57[5]
5 "The Desperation Emanation" October 21, 2010 4.1/13 13.05[6]
6 "The Irish Pub Formulation" October 28, 2010 4.2/13 13.04[7]
7 "The Apology Insufficiency" November 4, 2010 4.7/14 14.00[8]
8 "The 21-Second Excitation" November 11, 2010 4.2/12 13.11[9]
9 "The Boyfriend Complexity" November 18, 2010 4.3/13 13.02[10]
10 "The Alien Parasite Hypothesis" December 9, 2010 3.9/12 12.03[11]
11 "The Justice League Recombination" December 16, 2010 4.0/13 13.24[12]
12 "The Bus Pants Utilization" January 6, 2011 4.4/13 13.98[13]
13 "The Love Car Displacement" January 20, 2011 4.2/12 13.63[14]
14 "The Thespian Catalyst" February 3, 2011 4.3/12 13.83[15]
15 "The Benefactor Factor" February 10, 2011 3.9/11 12.79[16]
16 "The Cohabitation Formulation" February 17, 2011 3.7/11 12.41[17]
17 "The Toast Derivation" February 24, 2011 3.8/11 12.35[18]
18 "The Prestidigitation Approximation" March 10, 2011 3.8/11 12.06[19]
19 "The Zarnecki Incursion" March 31, 2011 3.7/12 11.92[20]
20 "The Herb Garden Germination" April 7, 2011 3.7/12 11.40[21]
21 "The Agreement Dissection" April 28, 2011 3.3/10 10.71[22]
22 "The Wildebeest Implementation" May 5, 2011 3.2/11 10.50[23]
23 "The Engagement Reaction" May 12, 2011 3.4/11 10.78[24]
24 "The Roommate Transmogrification" May 19, 2011 3.6/12 11.30[25]


The fourth season received particular praise for character developments. Alan Sepinwall of Uproxx praised the additions of Bernadette and Amy to the cast, writing that "With Amy Farrah Fowler and Bernadette promoted to semi-permanent status, the show is now able to spend large chunks of each episode focusing only on the women, and in the process has made Penny a much more well-rounded character rather than just a foil for the nerds".[26] Todd VanDerWerff of The A.V. Club wrote that "Jim Parsons and Kaley Cuoco's interplay remains the show's secret weapon",[27] and Eric Hochberger of TV Fanatic wrote: "Really though, everything about the main story worked amazing. Mayim fits in perfectly in The Big Bang Theory cast and played off of Kaley Cuoco just as well as Emmy Award-winning Parsons".[28]


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  14. ^ a b Gorman, Bill (January 21, 2011). "Thursday Final Ratings: '$#*! My Dad Says' Adjusted Up, 'Bones' Adjusted Down". TV by the Numbers. Archived from the original on June 14, 2011. Retrieved January 21, 2011.
  15. ^ a b Gorman, Bill (February 4, 2011). "Thursday Final Ratings: 'Grey's Anatomy,' 'Vampire Diaries,' 'Mentalist' Adjusted Up; 'Private Practice,' 'Parks & Recreation' Adjusted Down". TV by the Numbers. Archived from the original on February 7, 2011. Retrieved February 8, 2011.
  16. ^ a b Gorman, Bill (February 11, 2011). "Thursday Final Ratings: 'American Idol,' 'Vampire Diaries' Adjusted Up; 'Private Practice,' 'Bones,' 'Office,' 'Parks & Rec' Down". TV by the Numbers. Archived from the original on February 14, 2011. Retrieved February 11, 2011.
  17. ^ a b Seidman, Robert (February 18, 2011). "Thursday Final Ratings: 'American Idol' Adjusted Up; 'Parks & Recreation,' 'Private Practice' Adjusted Down". TV by the Numbers. Archived from the original on February 21, 2011. Retrieved February 18, 2011.
  18. ^ a b Seidman, Robert (February 25, 2011). "Thursday Final Ratings: 'Grey's Anatomy' Adjusted Up; 'The Office,' 'Outsourced,' and 'Private Practice' Down". TV by the Numbers. Archived from the original on February 28, 2011. Retrieved February 25, 2011.
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  20. ^ a b Gorman, Bill (April 1, 2011). "Thursday Final Ratings: 'American Idol,' 'Big Bang Theory,' 'Rules Of Engagement,' 'CSI,' 'Grey's Anatomy' Adjusted Up". TV by the Numbers. Archived from the original on April 4, 2011. Retrieved April 1, 2011.
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  26. ^ Sepinwall, Alan (May 20, 2011). ""The Roommate Transmogrification": Trading places". Uproxx. Woven Digital. Archived from the original on January 6, 2017. Retrieved January 5, 2017.
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General references

External linksEdit