The Big Bang Theory (season 2)

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The Big Bang Theory
(season 2)
Big Bang Theory 2.jpg
Second season DVD cover art
Country of origin United States
No. of episodes 23
Original channel CBS
Original release September 22, 2008 (2008-09-22) – May 11, 2009 (2009-05-11)
Season chronology
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Season 1
Next →
Season 3
List of The Big Bang Theory episodes

The second season of the American sitcom The Big Bang Theory was originally aired on CBS from September 22, 2008 to May 11, 2009 over 23 episodes. The Complete Season DVD was released September 15, 2009, and a Blu-ray version was reissued on July 10, 2012 with remastered surround sound audio, whereas the DVD version only had stereo. Season two starts immediately after the end of season one with Leonard and Penny's date.


  • Dr. Leonard Hofstadter, portrayed by Johnny Galecki, is an experimental physicist with an IQ of 173 who received his doctorate when he was 24 years old. He shares an apartment with colleague and friend Sheldon Cooper and is the straight man of the series. He and Penny dated once at the beginning of the season.
  • Dr. Sheldon Cooper, portrayed by Jim Parsons, is a theoretical physicist. Originally from East Texas, he was a child prodigy, starting college at the age of 11, right after completing the fifth grade. He has an IQ of 187 and exhibits a strict adherence to routine; a lack of understanding of irony, sarcasm and humor; and a complete lack of humility. Leonard describes Sheldon as being "one lab accident away from being a super-villain".
  • Penny, portrayed by Kaley Cuoco, is a waitress who lives across the hall from Leonard and Sheldon. She has aspirations of a career in show business, and has been to casting calls and auditions but has not been successful thus far. Her last name has never been revealed.
  • Howard Wolowitz, portrayed by Simon Helberg, works as an aerospace engineer. He is Jewish, and lives with his mother. Unlike Sheldon, Leonard, and Raj, Howard lacks a Ph.D. He defends this by pointing out that he has a master's degree in Engineering from MIT and the apparatus he designs are actually built and launched into space, unlike the purely abstract work of his friends. He provides outrageous pick-up lines and fancies himself a ladies man with suitably unimpressed reactions from Penny and has limited success with other women.
  • Dr. Rajesh "Raj" Koothrappali, portrayed by Kunal Nayyar, originally comes from New Delhi, India. Known commonly as "Raj", he works as an astrophysicist at Caltech. He is very shy around women and is unable to talk to them unless he drinks alcohol. However, he has much better luck with women as opposed to his overly confident best friend Howard.
  • Leslie Winkle, portrayed by Sara Gilbert, is an experimental physicist who has casual sex with both Howard and Leonard during the show's airing. She does not get along well with Sheldon and frequently mocks him.


Season two begins to deal with character development, including Sheldon becoming more and more obsessive. Leonard and Penny's relationship takes a turn for the worse when they break up, but quickly is resolved. Soon their relationship progresses into a stronger friendship than before, while Sheldon and Penny's friendship slowly begins. In the season finale Penny hints at her true feelings for Leonard. Howard's character remains similar to that of season one in his attempts to seduce women, managing to start a short-lived sexual relationship with Leslie Winkle in the second half of the season. Meanwhile, Rajesh manages to briefly apologize to Penny for what he did in "The Griffin Equivalency" without having consumed alcohol.

No. in
No. in
Title Directed by Written by Original air date Production
U.S. viewers
18 1 "The Bad Fish Paradigm" Mark Cendrowski Story by: Bill Prady
Teleplay by: Dave Goetsch & Steven Molaro
September 22, 2008 (2008-09-22) 3T7351 9.36[1]

Leonard and Penny are returning from their first date (from the Season 1 finale The Tangerine Factor) while Howard and Raj spy on them using a webcam on the corridor. Leonard spots the camera and suggests going over to Penny's apartment, but she misunderstands him and tells him to "slow things down". The guys try to convince Leonard that the date did not go too well, which he denies. Later, Penny tells Sheldon that she lied to Leonard about graduating from community college as she feels that Leonard would not want to date a woman who is not smart and makes him promise not to tell Leonard. Unfortunately, Sheldon finds it difficult to keep the secret and moves out of the apartment as a result. He first stays in Raj's apartment, but after he criticizes Aishwarya Rai (while comparing her to Madhuri Dixit), Raj leaves him with Howard. At Howard's house, Sheldon is unable to sleep, so Howard gives him Valium and takes him back to the apartment. Sheldon, in his drugged state, tells Leonard the secret. The next morning, Leonard suggests Penny should join Pasadena City College, but tells her that he does not mind dating someone who isn't smart after she asks, to which she slams her door in his face.

Recurring character: Carol Ann Susi as Mrs. Wolowitz
Note: The title sequence was updated with this episode.

Title reference: Howard calling Leonard a "bad fish" in his relationship with Penny.
19 2 "The Codpiece Topology" Mark Cendrowski Story by: Chuck Lorre
Teleplay by: Bill Prady & Lee Aronsohn
September 29, 2008 (2008-09-29) 3T7352 8.76[2]

After the guys return from a Renaissance fair and see Penny with her new boyfriend, Eric, Leonard decides to once again pursue a relationship with Leslie. Thinking that she needs to "slow things down", Leslie agrees to date Leonard, repeatedly assuming the dominant role before conceding that Leonard should assume the "male role". With this new attitude, Leslie goes as far as evaluating Leonard's genetic defects, and talking about procreating with him. Penny dumps Eric when he doesn't understand the Schrodinger's cat principle which Leonard explained to her in the season 1 finale. Sheldon explains to Penny that he feels uncomfortable with Leonard dating his arch enemy, who is a "sloppy, arrogant, sub-par scientist". After Penny's advice, Sheldon formally approves the relationship between Leonard and Leslie. However, almost immediately, Leslie and Sheldon start an argument about the validity of loop quantum gravity, which Leslie supports, and string theory, which Sheldon supports. Leslie expects Leonard to back up her beliefs, but when Leonard prefers string theory, Leslie decides to dump him. Relieved, Sheldon tells Leonard to look on the bright side and that it is only another nine months until Comic Con.

Recurring character: Sara Gilbert as Leslie Winkle
Guest star: Travis Schuldt as Eric

Title reference: Sheldon stating that the Renaissance Fair was just an excuse to wear a codpiece.
20 3 "The Barbarian Sublimation" Mark Cendrowski Story by: Nicole Lorre
Teleplay by: Steven Molaro & Eric Kaplan
October 6, 2008 (2008-10-06) 3T7353 9.33[3]

Sheldon becomes distracted from playing Age of Conan by Penny who has been accidentally locked out of her apartment. Along with this event, Penny is frustrated by her failures in life such as not progressing in her acting career, and not having sex for six months. As Sheldon invites Penny into his apartment to wait for the locksmith to open her door, she becomes curious about the game Sheldon is playing, and quickly becomes addicted. In the following days, Penny experiences video game addiction, calls Sheldon at all times for help, and stops going to work to play the game nonstop. After talking with Leslie Winkle, Sheldon realizes that Penny needs to have sex to relieve her stress and regain her regular life. Sheldon then attempts to set Penny up with an online dating service, but fails miserably. In the end, Penny overcomes her addiction when she realizes she accepted to have a virtual date with Howard. Horrified, she promptly stops playing.

Recurring characters: Sara Gilbert as Leslie Winkle and Mark Harelik as Dr. Eric Gablehauser

Title reference: Penny becoming addicted to playing the computer game Age of Conan set in Robert E. Howard's universe of Conan the Barbarian.
21 4 "The Griffin Equivalency" Mark Cendrowski Story by: Bill Prady & Chuck Lorre
Teleplay by: Stephen Engel & Tim Doyle
October 13, 2008 (2008-10-13) 3T7354 9.36[4]

Raj is included in People magazine's "30 Visionaries Under 30 Years Old to Watch" list for his discovery of the trans-Neptunian object 2008 NQ17, sparking jealousy from his friends. Despite Leonard's comments that they need to be supportive, fame soon goes to Raj's head: he receives star treatment from Dr. Gablehauser, gets an assistant, and even invites Penny to People's reception. After the party, a very intoxicated Raj returns home with Penny, and via webcam introduces her to his parents as his girlfriend. The night ends with Penny denying being Raj's girlfriend, and leaving after he becomes sick from over drinking. The following morning, a sober and shy Raj tries to apologize to Penny for his behavior. Although Raj attempts to leave a written note, Penny ultimately forces him to utter a barely audible "Sorry", at which point she forgives him.

Recurring character: Mark Harelik as Dr. Eric Gablehauser, Brian George as Dr. V.M. Koothrappali and Alice Amter as Mrs. Koothrappali
Note: Cameo appearance by Charlie Sheen

Title reference: Sheldon wishing a griffin as his ideal pet and considering a substitute for Raj as a friend.
22 5 "The Euclid Alternative" Mark Cendrowski Story by: Bill Prady & Steven Molaro
Teleplay by: Lee Aronsohn & Dave Goetsch
October 20, 2008 (2008-10-20) 3T7355 9.28[5]

Leonard is working nights on an experiment, resulting in his inability to drive Sheldon to the university. As a result, Sheldon must find another way to get to work. He asks Penny, Howard and Raj for assistance, but they all eject him from their respective vehicles for being annoying. The friends finally stage an "intervention" and tell Sheldon to get a driver's license and learn to drive. After an eventful trip to the DMV, resulting in Sheldon getting his learner's permit just to get him to leave, the group sets up a driving simulator for him in the living room. The ensuing practice shows that Sheldon is a horrible driver, but instead of admitting defeat, he simply concludes that he is too highly evolved to drive a car. In the end, Sheldon decides to live in his office at the university, so that he does not have to commute. However, Leonard reveals that he actually finished his experiment a week ago and is just enjoying the apartment without Sheldon.

Guest star: Octavia Spencer as DMV employee

Title reference: The Euclid Avenue that Sheldon is afraid of passing through on his way to work.
23 6 "The Cooper–Nowitzki Theorem" Mark Cendrowski Story by: Stephen Engel & Daley Haggar
Teleplay by: Tim Doyle & Richard Rosenstock
November 3, 2008 (2008-11-03) 3T7356 9.67[6]

After a lecture by Leonard and Sheldon, a graduate student named Ramona Nowitzki becomes obsessed with Sheldon, and insinuates herself into his life as a platonic girlfriend/assistant. Sheldon likes having someone who brings him free food and performs personal services for him. Ramona proves to be a helpful influence on Sheldon's work, but he becomes tired of her as she prohibits his recreational activities, and forces him to solely concentrate on his research. Eventually Sheldon realizes that he is in "some sort of relationship" with Ramona, and seeks help from Penny and Leonard to get rid of her, without success. Things come to a conclusion when Sheldon reaches a breakthrough in his scientific research and Sheldon is extremely grateful and asks if he can do something for her. Ramona suggests they share credit for his discovery calling it "The Cooper-Nowitzki Theorem". Naturally, Sheldon refuses and subsequently kicks Ramona out. In the end, after reading a draft paper of the new theorem, another student approaches Sheldon in the same way Ramona did the first time.

Recurring character: Sara Gilbert as Leslie Winkle
Guest star: Riki Lindhome as Ramona Nowitzki

Title reference: Ramona Nowitzki's suggested name for the theorem that Sheldon develops.
24 7 "The Panty Piñata Polarization" Mark Cendrowski Story by: Bill Prady & Tim Doyle
Teleplay by: Jennifer Glickman & Steven Molaro
November 10, 2008 (2008-11-10) 3T7357 10.01[7]

When Penny's cable gets cut, she comes over to the guys' apartment to watch America's Next Top Model. However, she accidentally sits on Sheldon's spot on the couch and touches his onion rings, prompting Sheldon to banish her from his apartment. A series of confrontations between Sheldon and Penny follows, such as Sheldon cutting access to Penny's Wi-fi and Penny ruining Sheldon's laundry night. Eventually, Sheldon places Penny's laundry on a telephone wire and dares her to get it. Leonard decides to end the confrontation between the two by asking Penny to complain to Sheldon's mother (Sheldon's kryptonite). Sheldon's mother forces Sheldon to apologize to Penny and give back her laundry.

Meanwhile, Howard finds out that the models in America's Next Top Model are in a house in Los Angeles. Determined to get in the house, he and Raj search for the house using all available technology and they successfully manage to find it. The episode ends with Howard and Raj entering the house by posing as cable guys.

Guest stars: Analeigh Tipton as herself and Samantha Potter as herself

Title reference: Sheldon hanging Penny's laundry from a wire and taunting her to play Panty Piñata.
25 8 "The Lizard–Spock Expansion" Mark Cendrowski Story by: Bill Prady
Teleplay by: Dave Goetsch & Jennifer Glickman
November 17, 2008 (2008-11-17) 3T7358 9.76[8]

Howard meets Stephanie at a bar and invites her to drive the Mars rover at the Jet Propulsion Laboratory, but the plan fails when the rover winds up stuck in a Martian ditch. Subsequently, to hide evidence of what he did, Howard destroys all the security tapes and hard drives relating to the mission. Afterwards, Leonard has a hard time deciding how to tell Howard that he has started dating Stephanie. Leonard decides to go to Howard's house to tell him personally, but while there, Stephanie calls Howard and gives him the news. Howard becomes very upset with Leonard, but this only lasts until Stephanie sets up Howard with another friend, and invites him on a double-date. In the end, Howard hears the news on TV that the rover found water on Mars in the bottom of the ditch, but as so much data was "inexplicably" lost no one will know who was responsible for the amazing discovery.

The episode is titled for its minor sub-plot where Sheldon and Raj play a game of rock-paper-scissors-lizard-Spock, which is "The Lizard-Spock Expansion" of the traditional game of rock-paper-scissors. They play to decide who gets to watch what on TV, but they all choose Spock. They, along with Howard, play the game for the last dumpling. When they choose all Spock again, they play it where none of them may hold up Spock, but they choose all hold up Spock again anyways.

Recurring characters: Sara Rue as Dr. Stephanie Barnett and Carol Ann Susi as Mrs. Wolowitz

Title reference: Sheldon's proposal to use the game "Rock-paper-scissors-lizard-Spock", an expanded form of the game "Rock-paper-scissors".
26 9 "The White Asparagus Triangulation" Mark Cendrowski Story by: Dave Goetsch & Steven Molaro
Teleplay by: Stephen Engel & Richard Rosenstock
November 24, 2008 (2008-11-24) 3T7359 10.19[9]

Sheldon considers Stephanie the only "tolerable" girlfriend that Leonard has had. As a result, Sheldon tries helping Leonard in his relationship with Stephanie, as otherwise he thinks Leonard will ruin it. However, Leonard does not want Sheldon's help as he quickly becomes annoying, even joining the couple when they have a romantic dinner, and when they go to the movies. After believing that Leonard is losing Stephanie, Sheldon attempts to prove Leonard's physical superiority to Stephanie by having him open a jar of white asparagus. However, Leonard shatters the jar by accident and has to get stitches. Following the trip to the hospital, Leonard finds Sheldon hacked his Facebook account, and changed his status to "In a relationship". Leonard worries that this will make him look desperate, but then finds that Stephanie changed her status to "Stephanie Barnett is in a relationship with Leonard Hofstadter". Sheldon then proclaims "Dr. Sheldon Cooper for the win."

Recurring character: Sara Rue as Dr. Stephanie Barnett

Title reference: The content of the jar that Leonard breaks, and the relationship triangle (Leonard-Stephanie-Sheldon) that features prominently.
27 10 "The Vartabedian Conundrum" Mark Cendrowski Story by: Chuck Lorre & Steven Molaro
Teleplay by: Bill Prady & Richard Rosenstock
December 8, 2008 (2008-12-08) 3T7360 10.80[10]

For all practical purposes, Stephanie has moved into Leonard and Sheldon's apartment, although Leonard does not acknowledge this. Meanwhile, Stephanie gives a physical examination to Sheldon, who complains about a ringing in his ear. After Penny shows up scantily clad in the guys' apartment, it turns out that neither Leonard nor Sheldon ever told Stephanie about Penny. The morning does not go well following that; Penny proves to Leonard that Stephanie is living with him, and Stephanie buys Leonard new clothes that he ends up hating. Realizing that his relationship with Stephanie is moving too fast for him, Leonard tries to tell Stephanie to move out, but every time he tries she diverts him by initiating sex. Meanwhile, Sheldon sneaks into the hospital to test himself multiple times, as the ringing has not stopped. By the time Leonard gets back to the apartment, Stephanie has diagnosed Sheldon with a fake larynx inflammation, and instructs him not to speak at all. She calls the diagnosis a "Sheldonectomy".

Recurring character: Sara Rue as Dr. Stephanie Barnett

Title reference: Sheldon cannot understand why the third-floor neighbor, Mrs. Vartabedian, dislikes him.
28 11 "The Bath Item Gift Hypothesis" Mark Cendrowski Story by: Bill Prady & Richard Rosenstock
Teleplay by: Stephen Engel & Eric Kaplan
December 15, 2008 (2008-12-15) 3T7361 11.42[11]

Sheldon worries about the approaching Christmas holidays and his indecision about what gift to get Penny. After deciding on a basket of bath items, he discovers a wide selection available; unsure about what Penny is going to get him and what he should get her in return, he buys an entire array to cover all contingencies. Penny's gift to Sheldon is a napkin both autographed and used by Leonard Nimoy. Sheldon is overwhelmed since he now possesses Nimoy's DNA and can grow his own Leonard Nimoy. He responds by giving Penny all the gift baskets and then a rare "Sheldon" hug.

Meanwhile, Leonard meets visiting researcher and fellow experimental physicist Dr. David Underhill. Although Leonard envies David for being handsome, charming, cool, and a more successful physicist than he is, he still jumps at David's offer to help him in his research. However, Leonard's joy of hanging out with David is hampered by jealousy when the latter meets Penny, and the two start dating. They later break up after she finds out he is married.

Guest star: Michael Trucco as Dr. David Underhill
Note: Jim Parsons submitted this episode for consideration due to his nomination for the Primetime Emmy Award for Outstanding Lead Actor in a Comedy Series at the 61st Primetime Emmy Awards.

Title reference: The gift that Sheldon gives to Penny.
29 12 "The Killer Robot Instability" Mark Cendrowski Story by: Bill Prady & Richard Rosenstock
Teleplay by: Steven Molaro & Daley Haggar
January 12, 2009 (2009-01-12) 3T7362 11.81[12]

Howard designs a robot, M.O.N.T.E. (Mobile Omnidirectional Neutralization and Termination Eradicator) using which the guys plan to enter the "Southern California Robot Fighting League Round Robin Invitational". When Penny arrives at the apartment, Howard begins to flirt with her however this time he pushes her too far and she lashes out at him in anger, calling him 'pathetic and creepy' and telling him he'll die alone. A depressed Howard returns home and remains in his room, refusing to go to work. Leonard advises Penny to go to Howard's house and apologize to him. When Penny goes to Howard's home to apologize, he begins to tell her about all his failed romances. Penny consoles him by saying that he is a good guy at heart and that he just tries too hard to get girls. After this however, Howard tries to kiss Penny, which results in her punching him. Howard is left happy, feeling he is halfway to 'pity sex'.

Meanwhile, the guys' co-worker Barry Kripke also plans to enter his robot for the competition, and challenges Sheldon and the guys to a one-on-one fight using their robots. Sheldon accepts the challenge, but Kripke's robot turns out to be far superior to M.O.N.T.E. and with Howard indisposed, Leonard and Raj plead with Sheldon to call off the fight, to no avail. During the fight, M.O.N.T.E. is destroyed by Kripke's robot.

Recurring characters: John Ross Bowie as Barry Kripke and Carol Ann Susi as Mrs. Wolowitz

Title reference: The killer robot created by the guys.
30 13 "The Friendship Algorithm" Mark Cendrowski Story by: Bill Prady & Richard Rosenstock
Teleplay by: Chuck Lorre & Steven Molaro
January 19, 2009 (2009-01-19) 3T7363 11.10[13]

Sheldon hears that Kripke is in control of an Open Science Grid computer, so he plans to befriend him to get access to the computer. Socially inept, Sheldon has trouble understanding how to make a new friend, and his current friends are not of much help in this respect. During a trip to the bookstore, Sheldon tries making friends with a little girl while Leonard gets him to quickly exit before he is picked up as a pedophile. Sheldon uses a children's book to help him design a flowchart to get new friends. This "scientific" procedure pays off, and Sheldon goes rock-climbing with Kripke which causes Sheldon to faint due to his fear of heights. Afterwards, they are back at the apartment, where Sheldon decides to cut off Raj as a friend to make room for Kripke. However, when Kripke reveals that he does not control use of the grid computer, Sheldon dismisses him and restores Raj's place in the line-up.

Recurring character: John Ross Bowie as Barry Kripke

Title reference: The algorithm created by Sheldon that he uses to make friends with Kripke.
31 14 "The Financial Permeability" Mark Cendrowski Story by: Chuck Lorre & Steven Molaro
Teleplay by: Richard Rosenstock & Eric Kaplan
February 2, 2009 (2009-02-02) 3T7364 10.89[14]

Penny is experiencing financial difficulties, which may result in her finding a new place to live. Sheldon, after discussing her difficulties, does the logical thing and lends her some money out of his savings. This leads to an amusing role reversal: while Sheldon does not particularly care about when his loan is repaid, Penny begins displaying neurotic behavior, reacting irritably to anything that hints at her monetary troubles. After Leonard learns about Penny's problems, he tries to help her cut expenses, and in the process also learns that her ex-boyfriend Kurt owes her $1800. Without telling Penny, Leonard and the guys go to Kurt's place to collect the money, but they are unsuccessful (Kurt writes "I owe Penny $1800, Kurt" on Leonard's forehead in indelible ink). Later, Penny pays Sheldon back, revealing that Kurt visited her the next morning and paid her in turn. However, much to Leonard's disappointment, Kurt never told Penny about Leonard's visit, and instead took the opportunity to get back together with her.

Recurring character: Brian Patrick Wade as Kurt

Title reference: Sheldon shows he is very willing to help his friends financially when he offers to help Penny.
32 15 "The Maternal Capacitance" Mark Cendrowski Story by: Chuck Lorre & Bill Prady
Teleplay by: Richard Rosenstock & Steven Molaro
February 9, 2009 (2009-02-09) 3T7365 13.11[15]

Leonard suddenly becomes worried when he learns his mother, accomplished psychiatrist and neuroscientist Dr. Beverly Hofstadter, is coming to visit. Upon arriving at the building, Beverly meets Penny, and by the time they reach Leonard's apartment, Penny is in tears after having her childhood issues psychoanalyzed. Sheldon, on the other hand, instantly develops a comfortable relationship with Leonard's mother, who turns out to be as strict and logical as himself.

Howard and Raj also meet Beverly, but after learning that Howard still lives with his mother and that Raj cannot speak to women, she is quick to declare that they are in an "ersatz homosexual marriage". Later, Leonard goes to talk to Penny, and they both seek comfort in each other, discussing their respective childhood issues with their parents. As they become drunk, Penny and Leonard are about to have sex, but Leonard ruins the moment by using psychology and noting that he is having sex with his mom and she with her dad. Disgusted, Penny throws Leonard out of the apartment.

Recurring character: Christine Baranski as Dr. Beverly Hofstadter
Note: This was the most watched episode of season 2, with 13.11 million viewers, and Christine Baranski was nominated for a Primetime Emmy Award for Outstanding Guest Actress in a Comedy Series for her performance in this episode.

Title reference: Leonard's mother visiting him.
33 16 "The Cushion Saturation" Mark Cendrowski Story by: Chuck Lorre
Teleplay by: Bill Prady & Lee Aronsohn
March 2, 2009 (2009-03-02) 3T7366 10.94[16]

Penny accidentally shoots the paintball gun at Sheldon's couch cushion, and she and Leonard have a hard time getting it cleaned. Naturally, Sheldon freaks out when he finds out his favorite spot has been damaged. In the end, Sheldon is still dissatisfied with the dry-cleaned cushion, and he team-kills Penny in the next paintball game, causing the others to "surrender, then (go to) Denny's".

Meanwhile, Leslie and Howard start sleeping together during a paintball match, and she is able to secure funds for his work, and even invites him to a trip to the CERN Large Hadron Collider project in Geneva. However, this turns out to be just Leslie's way to control Howard. Although initially reluctant to be in this sort of relationship, Howard later happily accepts his role as a "sex toy/arm candy".

Recurring character: Sara Gilbert as Leslie Winkle

Title reference: Sheldon's cushion, which Penny "saturates" with paint.
34 17 "The Terminator Decoupling" Mark Cendrowski Story by: Bill Prady & Dave Goetsch
Teleplay by: Tim Doyle & Stephen Engel
March 9, 2009 (2009-03-09) 3T7367 9.46[17]

The guys take a train trip to a conference in San Francisco, where the guest speaker is 2006 Nobel Prize laureate Dr. George Smoot. However, the trip suddenly becomes more exciting when the guys realize Summer Glau of Terminator: The Sarah Connor Chronicles is on board. Leaving his shyness behind while drinking beer, Raj is the first to approach Summer, who gets along with him. Howard gets angry, but he notices that Raj drank non-alcoholic beer unbeknownst to him, causing a placebo effect. Howard notices this and gives Raj the bottle. Upon reading the label Raj reverts to his usual timid self. Howard then takes over, but creeps Summer out with his wild dreams and his awkward style. Leonard eventually gets his chance, but Summer gets off the train before he can introduce himself.

Meanwhile, Sheldon realizes he forgot his USB flash drive with a paper he wants to show to Smoot, and he needs Penny to find it in his room and email the paper to him. In the end, Dr. Smoot (guest starring as himself) is not impressed with Sheldon's proposal of research, asking him "With all due respect, Dr. Cooper, are you on crack?"

Guest stars: Summer Glau as herself and George Smoot as himself

Title reference: Summer Glau and George Smoot's guest-starring on the show.
35 18 "The Work Song Nanocluster" Peter Chakos Story by: Bill Prady & Lee Aronsohn
Teleplay by: Dave Goetsch & Richard Rosenstock
March 16, 2009 (2009-03-16) 3T7368 9.76[18]

Penny develops home-made hair barrettes, called 'Penny Blossoms', which she expects to turn into a profitable homebased business. Sheldon soon points out the flaws in her production process, and helps her develop a better assembly line. Leonard, Howard, and Raj also contribute their own ideas for efficiency, production and marketing. Leonard designs the sales website, and right away they get an order for a thousand Penny Blossoms from the East Rutherford, New Jersey Gay-Lesbian-Bisexual-Transgender Alliance. Despite their initial happiness, they realize Leonard included a one-day rush shipping option in the website, so the quintet has to work all night to fulfill the order. However, the next morning, they discover that the same group doubled their order, leading everyone to quit in exhaustion. Meanwhile, Sheldon (who had earlier drunk coffee to stay awake) races around the apartment dressed as The Flash.

Title reference: A song that Sheldon and Penny sing to improve the manufacturing process.
36 19 "The Dead Hooker Juxtaposition" Mark Cendrowski Steven Molaro March 30, 2009 (2009-03-30) 3T7369 9.77[19]

The former tenants of the apartment above Leonard and Sheldon's move out, and (after an unsuccessful attempt by Wolowitz to rent the apartment, by trying to leave his mother's house) are replaced by an attractive blonde woman named Alicia, an aspiring actress who obtains a role as a dead hooker in an episode of the TV series CSI. The men become fascinated with Alicia, and she takes advantage of this by having them labor for her. As a result, Penny loses the guys' attention, and also comes to resent the way Alicia exploits the men. She tries to gain her friends back by bribing them with Chinese food, offering to watch Battlestar Galactica, and even memorizing a quantum physics joke. After Alicia brags about her exploitation of the men, while also expressing derision of their incomes, Penny confronts her. Alicia responds by saying that Penny exploits the men in the same way that she herself does, which leads to a physical altercation. After the fight, the friends learn that Alicia is sleeping with one of the CSI producers, leading Penny to comment that Alicia is a "dead whore on TV, live one in real life".

Recurring character: Carol Ann Susi as Mrs. Wolowitz
Guest star: Valerie Azlynn as Alicia

Title reference: Penny's line summarizing Alicia's behavior as sleeping her way to success as an actress while playing a dead prostitute in the television show CSI.
37 20 "The Hofstadter Isotope" Mark Cendrowski Dave Goetsch April 13, 2009 (2009-04-13) 3T7370 10.13[20]

When Penny accompanies the men to the comic book store to buy a present for her nephew's birthday, the owner, Stuart, asks her out on a date, prompting jealousy in Leonard. To take his mind off the situtation, Leonard asks Howard and Raj to take him to a bar to socialize with women, but neither he nor Howard succeed in finding a woman to couple with. Stuart's date with Penny goes well, but they are interrupted by Sheldon, who starts an argument with Stuart about who Bruce Wayne's successor as Batman should be, during which Penny falls asleep.

Recurring character: Kevin Sussman as Stuart Bloom
Note: This episode marks the first appearance of future regular cast member Kevin Sussman as Stuart Bloom.

Title reference: Leonard claims that Stuart is essentially the same person as he is.
38 21 "The Vegas Renormalization" Mark Cendrowski Story by: Jessica Ambrosetti, Nicole Lorre & Andrew Roth
Teleplay by: Steven Molaro
April 27, 2009 (2009-04-27) 3T7371 9.31[21]

Leslie ends her casual relationship with Howard, and he becomes depressed. Leonard and Raj decide to take him on a trip to Las Vegas, Nevada in order to cheer him up. While in Vegas, a prostitute named Mikayla approaches Raj, and eventually he and Leonard decide to hire her for Howard with her giving him the Jewish girlfriend role-playing treatment. Howard soon realizes she is a prostitute, but nevertheless he thanks Leonard and Raj for setting up this "date".

Meanwhile, Sheldon, who has declined to go to Las Vegas, is delighted to spend the weekend alone, until he forgets his apartment key. He is then forced to spend the night at Penny's apartment (like "an old married couple" per Penny) and, in the process, thinks he has a better understanding of the term "friends with benefits".

Guest star: Jodi Lyn O'Keefe as Mikayla

Title reference: The trip to Las Vegas that brought Howard back to his old ways.
39 22 "The Classified Materials Turbulence" Mark Cendrowski Story by: Chuck Lorre & Lee Aronsohn
Teleplay by: Bill Prady & Steven Molaro
May 4, 2009 (2009-05-04) 3T7373 9.25[22]

Howard celebrates the launch of his latest invention, a zero-gravity human-waste disposal system (a "space toilet"), to be used in the International Space Station, by buying all of his friends new comic books only for Howard to discover that he made a mistake that will cause the toilet to fail and explode after 10 flushes, and the guys convene to try and fix it (a la Apollo 13 's Ken Mattingly), working for a whole night to find a solution, even testing the toilet with meatloaf which Howard brought from his mother, saying: "It has been testing toilets for generations". In the end, the astronauts of the ISS report to NASA that they are going on an unscheduled "spacewalk", suggesting that Howard failed.

While at the comic book store, Stuart tells Leonard that he is having a second date with Penny and asks for advice. Leonard deliberately avoids Stuart's request, and ultimately gives him bad advice. The next day, Leonard feels guilty and goes to apologize to Stuart. Stuart reveals the date went really fine, until he and Penny started making out in his car and Penny accidentally called him "Leonard."

Recurring character: Kevin Sussman as Stuart Bloom

Title reference: The classified "space toilet" that Howard and the guys try to repair.
40 23 "The Monopolar Expedition" Mark Cendrowski Eric Kaplan & Richard Rosenstock May 11, 2009 (2009-05-11) 3T7372 9.81[23]

Sheldon wins a National Science Foundation grant to go on a three-month expedition to the Magnetic North Pole to detect magnetic monopoles and prove the validity of string theory. After some hesitation, he decides to go and also wants Leonard, Howard and Raj to come with him; they too initially hesitate as it would mean being locked in a cabin with Sheldon for three months, but they finally agree. To prepare for the expedition, Sheldon and the guys use the freezer at the Cheesecake Factory, however this later proves unnecessary as they are going to spend their entire time in a warm cabin. On the night before the expedition, Leonard expresses doubts on his coming on the expedition as it would mean that he would not see Penny for the whole summer and he also thinks that Penny is going to miss him after she gives him a blanket with sleeves and a long hug, but Sheldon rubbishes the theory. The next morning, when Leonard asks Penny what her actions the previous day meant, she claims to simply have wished him a safe trip, but after he closes the door, she sadly whispers "It means I wish you weren't going".

Meanwhile, in the Arctic, the boys abide to the same rules as in the apartment. Sheldon hides a snack away from Leonard, and pulls another "Bazinga".

Recurring characters: Carol Ann Susi as Mrs. Wolowitz, Brian George as Dr. V.M. Koothrappali and Alice Amter as Mrs. Koothrappali
Note: This is the first episode to feature Sheldon saying "Bazinga", which would later become his catchphrase.

Title reference: The trip that the guys take to find magnetic monopoles.


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General references

External links[edit]