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Season 1

Unaired Pilot

Unaired
The very first pilot of The Big Bang Theory. Leonard and Sheldon make spending money by donating to a sperm bank and later meet an attractive young woman in distress, who they decide to help.
Uncredited: Vernee Watson-Johnson as Althea | Iris Bahr as Gilda | Amanda Walsh as Katie
Director: James Burrows
Songs: Thomas Dolby -- She Blinded Me With Science

1 :01x01 - Pilot

Sep/24/2007
Leonard and Sheldon visit a high IQ sperm bank, but have regrets about going, so they leave, only to feel guilty afterwards. When they arrive back at the apartment, they see a beautiful blonde woman, Penny, in the apartment across the hallway and they attempt to befriend her. Sheldon, who has no experience being around someone like Penny, doesn’t know what to do, while Leonard really takes a shine to her. Meanwhile, Howard makes numerous attempts to impress Penny, while Koothrappali is too shy to talk to her.
Guest Stars: Brian Patrick Wade as Kurt |
Uncredited: Vernee Watson-Johnson as Althea
Director: James Burrows
Songs: Mac Davis -- Baby Don't Get Hooked On Me

2 :01x02 - The Big Bran Hypothesis

Oct/01/2007
A Superman movie marathon is disrupted when Penny asks the guys to sign for a package that may be delivered while she’s gone. But when the guys discover that the package is huge, they understand it’s going to take some hard work to get it up all the stairs. When they finally do so and manage to get into Penny’s apartment with the spare key she gave Leonard, Sheldon is shocked about how messy her apartment is, and decides to clean it during the night while Penny is sleeping. However, when Penny wakes up, she is furious that they were in her apartment and Leonard is sad while she is angry at them.
Director: Mark Cendrowski

3 :01x03 - The Fuzzy Boots Corollary

Oct/08/2007
The guys are playing a computer game, but are interrupted when they hear Penny laughing across the hall. But Leonard is in for a shocking discovery when he sees hear kissing with another guy. Trying to recover from the shock, Howard advices Leonard to date Leslie Winkle, one of the co-workers at the lab. Leonard agrees to do so, but things only get worse for him when Leslie turns him down. However, after Sheldon somehow manages to build up Leonard's self-confidence, Leonard tricks Penny into going on a date with him, but Leonard has a panic attack right before the date and it might ruin what was supposed to be a nice, romantic evening.
Special Guest Stars: Sara Gilbert as Leslie Winkle |
Co-Guest Stars: Allen Nabors as Doug | Treisa Gary as Waitress |
Uncredited: Sherry Weston as Instructor
Director: Mark Cendrowski
Songs: Augustana -- Boston

4 :01x04 - The Luminous Fish Effect

Oct/15/2007
When Sheldon gets fired, he tries to explore life like everyone else sees it. He goes food shopping with Penny, although she is less than happy about it, and afterwards he starts to perform a lot of different experiments he hasn’t been able to do with his busy job. It gets so serious that Leonard calls Sheldon’s mom for advice and she decides to make a visit to Sheldon, who becomes angry about Leonard calling her without his permission.
Special Guest Stars: Laurie Metcalf as Mary |
Guest Stars: Mark Harelik as Dr. Gablehauser (Dr. Eric Gablehauser) |
Co-Guest Stars: Sierra Edwards as Summer
Director: Mark Cendrowski

5 :01x05 - The Hamburger Postulate

Oct/22/2007
Playing with salt and pepper shakers at the Cheesecake Factory, the guys are forced to order or leave, and they decide to order. But Sheldon hasn’t eaten at the Factory before and therefore doesn’t know what’s good. Ending the argument, Leslie Winkle sees Leonard and asks if he wants to play the cello in a musical ensemble, an offer that Leonard agrees to, and the first practice is at his apartment. The practice doesn't turn out exactly as planned, however, when it turns into a sexual encounter. Sheldon, who has no experience being in the situation of knowing someone is just a few feet away making love, seeks wisdom from Penny.
Special Guest Stars: Sara Gilbert as Leslie Winkle
Songs: Bryan Adams -- Have You Ever Really Loved A Woman?

6 :01x06 - The Middle Earth Paradigm

Oct/29/2007
Embarrassed after being defeated by a Bar Mitzvah party at paintball, the guys are surprised when Penny invites them to her upcoming Halloween & Costume party. They decide to go, but for them, the party is a disaster. Sheldon, who is sad that there is not going to be a costume parade and awards, tries to make people guess what he has dressed up like, while Howard tries to impress different women at the party but with no success. Leonard gets in a disturbing situation when Penny’s ex-boyfriend Kurt shows up at the party and insults him, and Koothrappali tries not to talk to any women because of his mythology, but a situation pops up that result in him and a girl in bed together.
Guest Stars: Brian Patrick Wade as Kurt | Rachel Cannon as Patty |
Co-Guest Stars: Erin Allin O'Reilly as Cheryl | Kimberly Kevon Williams as Vicki | Cynthia Holloway as Roberta
Director: Mark Cendrowski

7 :01x07 - The Dumpling Paradox

Nov/05/2007
Penny asks the guys if she can spend the night in their apartment when a friend of her from Omaha is visiting. Apparently, her friend is a very bad person and Penny dislikes her, although Howard seems to really like her. Trying to make time pass while Howard is in her apartment with her friend, Penny joins Leonard, Sheldon and Koothrappali playing Halo, but Sheldon gets angry when she is much better than he is at the game.
Guest Stars: Brooke D'Orsay as Christy | James Hong as Chen |
Co-Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Kimberly Moss as Automated Cell Phone Voice (as Kimberly D. Brooks)
Director: Mark Cendrowski

8 :01x08 - The Grasshopper Experiment

Nov/12/2007
Koothrappali is not happy when his parents inform him that they have set up a blind date with a girl he knew from his childhood years. Apparently, the girl bullied Koothrappali a lot. His friends try to cheer him up, but there is no way out of it. Meanwhile, Penny has gotten a job that includes mixing drinks and she wants to practice mixing for the guys. However, everyone make a shocking discovery when Koothrappali has a drink, and manages to talk to the opposite sex.
Guest Stars: Sarayu Rao as Lalita (Lalita Gupta) | Brian George (1) as Dr. Koothrappali | Alice Amter as Mrs. Koothrappali
Director: Ted Wass
Songs: Sheldon Harnick -- To Life

9 :01x09 - The Cooper-Hofstadter Polarization

Mar/17/2008
The guys are performing a new scientific experiment, that includes sending a message around the world from their computer and, without using the remote, control any electricity in the room they’re in. While cleaning up afterwards, Leonard discovers a note from a science company wanting him and Sheldon to present one of their experiments. However, Sheldon does not want to present the case, while Leonard is quite happy and decides to do it, with Sheldon forbidding him to do so.
Co-Guest Stars: Talbott Lin as Chinese Leonard | Howard Chan as Chinese Sheldon
Director: Joel Murray
Songs: Richard Strauss -- Also sprach Zarathustra

10 :01x10 - The Loobenfeld Decay

Mar/24/2008
In the middle of a discussion, Leonard and Sheldon hear Penny’s awful singing, and when they see her coming down the stairs, they try to escape unsuccessfully. Penny informs them that she has gotten a singing role in a small play, but the big thing about it is that a lot of talent scouts are going to be there, and she is hoping for a real chance in show business. Because they don’t want to be there, Leonard cooks up a lie in which him and Sheldon are going to a symposium, but Sheldon feels guilty about the lie afterwards and cooks up a new plan that involves a fake cousin.
Guest Stars: DJ Qualls as Toby (Toby Loobenfeld)
Director: Mark Cendrowski
Story: Chuck Lorre | Teleplay: Bill Prady, Lee Aronsohn
Songs: (Unknown artist) -- Out Tonight

11 :01x11 - The Pancake Batter Anomaly

Mar/31/2008
Leonard and Sheldon are playing 3D Chess, but Leonard loses once again. Luckily for him, the conversation is disrupted when Penny comes home from her visit in Nebraska, but Sheldon is shocked when she tells them that her family got sick over the weekend. The result is that Sheldon gets paranoid about not getting sick, but when he does, it gets so bad he forces Penny to take care of him while the guys are out trying to avoid coming home.
Co-Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Erin Allin O'Reilly as Cheryl
Director: Mark Cendrowski
Songs: THX -- Deep Note, (Unknown artist) -- Soft Kitty

12 :01x12 - The Jerusalem Duality

Apr/14/2008
While having lunch at the lab’s cafeteria, Leonard and Sheldon are introduced to a 15-year-old boy prodigy who happens to be equally as smart as or even smarter than Sheldon, which has him angrier than ever. Knowing everything he will do in the future will somehow be corrected by the boy, Sheldon stops working at the lab and instead tries to help his fellow friends with their experiments, but they are less than happy about it. Finding out that Sheldon really needs to become the best achiever again, the guys cook up a plan to make the boy lose his focus.
Guest Stars: Mark Harelik as Dr. Gablehauser (Dr. Eric Gablehauser) | Austin Lee as Dennis (Dennis Kim) |
Co-Guest Stars: Emma Degerstedt as Emma |
Uncredited: Joel Brooks as Professor Goldfarb
Director: Mark Cendrowski
Songs: (Unknown artist) -- Cielito Lindo

13 :01x13 - The Bat Jar Conjecture

Apr/21/2008
Howard receives a mail on his cell phone saying that there is an open spot for a team at a Physics Bowl event coming up and the guys grab the opportunity. But when it turns out Sheldon answers all the questions during the rehearsals, the guys decide that he is off the team, but to fill in the remaining spot on the Bowl, Leslie Winkle agrees to be on their team. However, planning to make sure the guys don’t outsmart him, Sheldon creates his own team to join, even though he will be the one answering the questions.
Special Guest Stars: Sara Gilbert as Leslie Winkle |
Guest Stars: Mark Harelik as Dr. Gablehauser (Dr. Eric Gablehauser) | Adam Gregor as Dimitri |
Co-Guest Stars: Sandra Marquez as woman | Sergio Enrique as son
Director: Mark Cendrowski
Songs: Queen -- We Are The Champions

14 :01x14 - The Nerdvana Annihilation

Apr/28/2008
Leonard is bidding in an auction for a miniature time machine, but wasn’t expecting to actually get it. When he does so and it is delivered, the guys are shocked to learn that it isn’t a miniature after all and end up injuring themselves while carrying it up the stairs. Afterwards, Penny is even more shocked that they even bother to use so much time on stuff like that, so she calls them “pathetic”, hurting Leonard’s feelings terribly and resulting in him getting rid of all his geek stuff.
Guest Stars: Andrew Walker as Mike
Director: Mark Cendrowski

15 :01x15 - The Pork Chop Indeterminacy

May/05/2008
Sheldon gets a visit from his twin sister, Missy, who seems to be a much more interesting person that Sheldon believes she is. Leonard, Howard and Rajesh all seem to have a crush on her and everyone seems willing to fight for her love. This results in Sheldon deciding to pick out who she will go out with (despite her disapproval), but when the guys finally have enough strength to actually ask her out, they find out she is only interested in one person.
Guest Stars: Courtney Henggeler as Missy
Director: Mark Cendrowski
Story: Chuck Lorre | Teleplay: Lee Aronsohn, Bill Prady

16 :01x16 - The Peanut Reaction

May/12/2008
Finding out that Leonard has never had a birthday party thrown for him, Penny convinces the guys to create a surprise party. Howard and Raj are in on the idea, while Sheldon envies Leonard for never having the experience (due to bad childhood memories). However, when Penny finally convinces him and they go to the store to buy presents, Sheldon finds out that the customers in the store needs his help much more than Leonard, making the plan fall out of schedule.
Guest Stars: Vernee Watson-Johnson as Althea (as Verneé Watson) | Judith Moreland as Jan |
Co-Guest Stars: Ronald Hunter as Dan | Chuck Carter as Stan
Director: Mark Cendrowski

17 :01x17 - The Tangerine Factor

May/19/2008
When Penny breaks up with her boyfriend after she finds out he has been posting about their sex life on his blog, Leonard gets enough courage to ask her out on a real date. Penny is so depressed about the recent break-up, she agrees to go out with Leonard, but when they both face the reality of going out afterwards, they stress out so they much they both seek information about one another from Sheldon, a rather reluctant advisor.
Guest Stars: James Hong as Chen
Director: Mark Cendrowski

Season 2

18 :02x01 - The Bad Fish Paradigm

Sep/22/2008
Leonard and Penny return from their date, but it ends in an odd matter when Penny wants to take things slower. While Leonard is living his normal everyday life, Penny is now worrying if she is smart enough for Leonard, as she has none of the same interests as him, so she seeks advice from Sheldon and even tells him a secret. However, when it turns out Sheldon can’t keep her secret, the relationship between Leonard and Penny may be broken forever.
Co-Guest Stars: Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski

19 :02x02 - The Codpiece Topology

Sep/29/2008
After Leonard sees Penny with a new guy, he decides it’s time to move on with his life. When Leslie Winkle enters the lab, she invites Leonard to get a relationship. However, Sheldon hates Leslie and Penny wants them to break up, so Penny receives advice from Sheldon, but with no good results. Meanwhile, the relationship hits a bump when it turns out Leonard rather supports Sheldon’s science theories than Leslie’s.
Guest Stars: Travis Schuldt as Eric
Director: Mark Cendrowski
Story: Chuck Lorre | Teleplay: Lee Aronsohn, Bill Prady

20 :02x03 - The Barbarian Sublimation

Oct/06/2008
When Penny becomes depressed due to the thoughts that she fails everything in life, the guys try everything to make her better, but with no results. However, when Penny sees Sheldon’s game, “Age of Conan”, she becomes addicted playing it, and winds up a slob. Meanwhile, the evil sparks between Sheldon and Leslie have still not disappeared.
Guest Stars: Mark Harelik as Dr. Gablehauser (Dr. Eric Gablehauser) |
Co-Guest Stars: Tyler J. Olson as Blaine | Mark Hames as Tom
Director: Mark Cendrowski

21 :02x04 - The Griffin Equivalency

Oct/13/2008
When Koothrappali discovers a new planet, he is honored the ”30 under 30” award from People Magazine, and the guys try to show their spirit by inviting him to dinner, but there is one person who just can’t show his support; Sheldon, who believes receiving an award for something that the recipient didn’t actually create, is fake. The guys try to convince him into thinking otherwise, but when Koothrappali’s self-esteem builds up to the max, he becomes so obnoxious that they all try to avoid him. Meanwhile, Koothrappali invites Penny to go the People Magazine party, but the only way he can talk to Penny is while being drunk, which puts a halt to their friendship.
Special Guest Stars: Charlie Sheen as Himself (Special Appearance by) |
Guest Stars: Mark Harelik as Dr. Gablehauser (Dr. Eric Gablehauser) | Brian George (1) as Dr. Koothrappali | Alice Amter as Mrs. Koothrappali
Director: Mark Cendrowski

22 :02x05 - The Euclid Alternative

Oct/20/2008
When Leonard does experiments where he needs to use a laser only available during the night, he is unable to drive Sheldon to and from work in the morning. Sheldon, who can’t drive, seeks help from Penny, Howard and Koothrappali, but they all get so angry they refuse to drive him. However, the only way for them to get Sheldon off their back is to get him driving a car, which he’s terrible at, leaving the guys and Penny between a rock and a hard place.
Guest Stars: Octavia Spencer as Octavia |
Co-Guest Stars: Elena Campbell-Martinez as Maria | Livia Trevino as Lourdes
Director: Mark Cendrowski

23 :02x06 - The Cooper-Nowitzki Theorem

Nov/03/2008
After speaking at a student seminar, Sheldon quickly finds himself in an unusual situation; a girl approaches him interested in helping him with his research. Not needing the help, Sheldon instead gets her to take care of all his daily work for him so he can focus entirely on his work. However, when she gets too pushy, going as far as washing his feet while he works, Sheldon seeks advice from Penny in order to get her off his back, but it’s harder than they thought. Meanwhile, the guys are baffled that someone can survive a full day with Sheldon as she does, and they begin to miss Sheldon during Halo, paintball and other such activities.
Guest Stars: Riki Lindhome as Ramona (Ramona Nowitzki) | Emily Happe as Kathy (Kathy O'Brien)
Director: Mark Cendrowski

24 :02x07 - The Panty Piñata Polarization

Nov/10/2008
Officially becoming a member of their group, according to Sheldon, Penny has huge problems fitting in with the house rules. When Penny gets “3 strikes”, she is banished and can’t even talk to Sheldon anymore, putting Leonard in a difficult situation where he must choose which side of the argument he should stay on. Meanwhile, Penny declares a war between Sheldon and her, where the weak sides of them both are exposed; Penny’s lingerie is put out on a telephone wire, while Sheldon’s “laundry day” is ruined when all the machines are taken, and there seems to be no end of this war.
Co-Guest Stars: Analeigh Tipton as Analeigh | Samantha Potter as model
Director: Mark Cendrowski

25 :02x08 - The Lizard-Spock Expansion

Nov/17/2008
Wolowitz has once again used his “dating skills” to make a mess when he invites a girl, Stephanie, to drive the Mars Rover, only to have it stuck in a ditch. He now needs help from the other guys, but he also wants someone to take care of Stephanie, whom Leonard drives home. However, when Leonard and Stephanie kiss in the car and start a relationship, Wolowitz becomes so angry at him he starts ignoring them both completely. Meanwhile, Penny is so happy that Leonard is in a relationship, but he’s not sure if it pushes Penny away from him or not.
Guest Stars: Sara Rue as Stephanie (Dr. Stephanie Barnett) | Carol Ann Susi as Mrs. Wolowitz |
Co-Guest Stars: Jennifer Hale as News Announcer | Robert Clotworthy as Announcer
Director: Mark Cendrowski

26 :02x09 - The White Asparagus Triangulation

Nov/24/2008
The relationship between Leonard and Stephanie is going quite well, but Sheldon really likes her and is afraid Leonard isn’t manly enough. Therefore, he decides to create a situation where he needs help from Leonard in order to make him look big in front of Stephanie. However, when his plan backfires, Sheldon becomes so worried that their relationship might end that he goes as far as hacking Leonard’s computer.
Guest Stars: Sara Rue as Stephanie (Dr. Stephanie Barnett)
Director: Mark Cendrowski

27 :02x10 - The Vartabedian Conundrum

Dec/08/2008
When Penny uncovers the truth in Leonard and Stephanie’s relationship, that they are only dating because she likes him, Penny decides to counsel Leonard on the subject. She tells him that his feelings are just as important as everybody else’s, and this gives Leonard the courage to break up with Stephanie… he thinks. After failing to break up several times, he doesn’t know whether to stay in an unsuccessful relationship, or break up and stay single until he can find someone else.
Guest Stars: Sara Rue as Stephanie (Dr. Stephanie Barnett)
Director: Mark Cendrowski

28 :02x11 - The Bath Item Gift Hypothesis

Dec/15/2008
When Leonard meets David Underhill, an award-winning scientist who is the exact opposite of Leonard (handsome, cool and intelligent), Leonard is put in the worst situation he can imagine when David and Penny become more than friends. Meanwhile, Penny buys a Christmas gift for Sheldon, but unfortunately, Sheldon thinks of Christmas as an annoying part of the year where the recipient of a gift is tied to a promise to give the sender a gift back, and Sheldon doesn’t know what to do.
Special Guest Stars: Michael Trucco as Dr. David Underhill |
Guest Stars: Michael Hyatt as Charlotte
Director: Mark Cendrowski

29 :02x12 - The Killer Robot Instability

Jan/12/2009
After Kripke challenges them to a robot duel, the guys build MONTE; a killer robot with many deadly features. But when their robot loses the competition, the guys are humiliated in front of Kripke. Meanwhile, Penny finally tells Howard about his rude behavior towards women, which actually has really, really bad effects on him when he goes into a depression, memorizing all his girlfriend troubles and wondering why he can’t pick up girls.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | John Ross Bowie as Barry Kripke
Director: Mark Cendrowski

30 :02x13 - The Friendship Algorithm

Jan/19/2009
When Sheldon finds out that Kripke is the only person who controls a new supercomputer at the University, Sheldon makes it his mission to befriend Kripke, but due to his problems making friends, Sheldon takes a scientific procedure, which works. However, their friendship may disappear again when it is uncovered that Kripke actually does not have any control of the supercomputer.
Guest Stars: John Ross Bowie as Barry Kripke |
Co-Guest Stars: Will Deutsch as Jeremy | Jane Galloway Heitz as Mildred | Jade Zdanow as Rebecca
Director: Mark Cendrowski

31 :02x14 - The Financial Permeability

Feb/02/2009
After Penny enters a financial crisis, Sheldon lends her money, which she is uncomfortable about. Leonard decides to figure out what the cause of the crisis is, and soon finds out that Penny’s ex-boyfriend Kurt owes her money that he still hasn’t returned. Leonard confronts Kurt with the rest of the guys as back-up, but the plan hits a halt when Kurt gives the money back, but also continues his relationship with Penny.
Guest Stars: Brian Patrick Wade as Kurt
Director: Mark Cendrowski

32 :02x15 - The Maternal Capacitance

Feb/09/2009
When Leonard’s mother, Beverly, comes for a visit, a normal week for the guys and Penny takes a much unexpected turn; Beverly is a neuroscientist who talks to Penny about her problems (making Penny cry like a little girl), Leonard becomes so tired he spends much time in Penny’s apartment (in Penny’s bed… with Penny), Sheldon finds an unusually comfortable person in Beverly, and she believes Rajesh and Howard are in a homosexual sex-relationship.
Special Guest Stars: Christine Baranski as Beverly (Dr. Beverly Hofstadter)
Director: Mark Cendrowski
Songs: Journey -- Any Way You Want It, Red Hot Chili Peppers -- Under The Bridge

33 :02x16 - The Cushion Saturation

Mar/02/2009
Penny finds herself in the worst situation ever when she accidentally shoots a paintball pellet on Sheldon’s cushion, also known as his “spot” on the couch. While she desperately tries everything to fix it, Sheldon is now left with no option rather than to always stand or find another place to sit; much to his dismay. Meanwhile, Leslie and Howard start a sexual relationship together, but he doesn’t know there are no feelings in it, and he asks himself whether or not he likes the idea of being used as a sex object. However, when it turns out Leslie has access to extra grant money which she is willing to give to him so he can continue his research; he becomes really unsure what to do.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski
Story: Chuck Lorre | Teleplay: Lee Aronsohn, Bill Prady

34 :02x17 - The Terminator Decoupling

Mar/09/2009
Aboard a train on their way to San Francisco for a symposium held by Dr. George Smoot, each of the guys has their own separate problems on the train. While Sheldon is desperately finding a way to retrieve his paper he forgot at home, Leonard tries to get some sleep, but it’s difficult with Sheldon’s constant nagging. Meanwhile, Koothrappali and Howard attempt to hit on an actress they spot on the train, but they fight about who should get her and they both destroy one another’s chances at love.
Special Guest Stars: Summer Glau as Herself (Special Appearance by) |
Co-Guest Stars: Dr. George Smoot as Himself | Robert Clotworthy as Conductor
Director: Mark Cendrowski

35 :02x18 - The Work Song Nanocluster

Mar/16/2009
Penny wants to start her own business, making hair clips she calls ”Penny Blossoms”, but she has no marketing, manufacturing or commercial knowledge, and receives help from the guys, especially Sheldon. However, when they get an over-night order with 1000 Penny Blossoms, it’s going to take a lot more than “hard work” to complete the order within the 24 hours they have. Meanwhile, Penny convinces Sheldon into drinking his first cup of coffee, but the results are Sheldon becoming hyperactive and acting as if he was using drugs.
Director: Peter Chakos

36 :02x19 - The Dead Hooker Juxtaposition

Mar/30/2009
Penny feels threatened when a new, very hot girl moves into the apartment right above the guy’s and start using her looks to get help from the guys; fixing stereos and driving her places. Penny, going crazy that she can’t even talk to the guys anymore as they don’t listen to her, understands she has to do something with this new girl, and confronts her. However, the confrontation is a little bit more than just a swear word or two and ends in a chick fight.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Valerie Azlynn as Alicia
Director: Mark Cendrowski

37 :02x20 - The Hofstadter Isotope

Apr/13/2009
When Stuart, the sales clerk at the comic book store, charms Penny completely and gets her to go out with him, everyone is baffled at how he did it. Leonard’s dismay that Penny would go out with Stuart and not him drives him insane, but when an argument between Sheldon and Stuart results in a break-up between Stuart and Penny, Leonard offers his shoulder for Penny “to cry on”. Meanwhile, Howard and Koothrappali head to a women’s bar to pick up girls, and while Howard fails at getting sex, Koothrappali scores… surprisingly.
Guest Stars: Kevin Sussman as Stuart |
Uncredited: Ian Scott Rudolph as Captain Sweatpants
Director: Mark Cendrowski

38 :02x21 - The Vegas Renormalization

Apr/27/2009
When Leslie breaks up with Howard, he becomes so devastated he agrees to go with Leonard and Koothrappali to Las Vegas to cheer him up. But when they arrive, it turns out being a difficult job in itself to get Howard outside the apartment, as all he does is tracking Leslie’s online activities. Meanwhile, Sheldon locks himself out of the apartment back home and much to his and Penny’s dislike spends the night in Penny’s apartment, but he is not able to perform his daily routines and misses home.
Guest Stars: Jodi Lyn O'Keefe as Mikayla
Director: Mark Cendrowski
Songs: Kaley Cuoco -- Soft Kitty

39 :02x22 - The Classified Materials Turbulence

May/04/2009
Another date between Penny and Stuart ends in disaster when Penny calls out Leonard's name instead of Stuart's during a make-out. When Leonard finds out, he doesn't know exactly what to do, but his conscience bothers him since he gave Stuart bad advices on how to proceed on the date with Penny. Meanwhile, Howard discovers a big design flaw in his NASA Space Toilet, and needs emergency help from his friends, but it may not be enough.
Guest Stars: Kevin Sussman as Stuart |
Co-Guest Stars: Robert Clotworthy as Astronaut | Travis Davis as Ground Controller |
Uncredited: Ian Scott Rudolph as Captain Sweatpants
Director: Mark Cendrowski

40 :02x23 - The Monopolar Expedition

May/11/2009
When Sheldon meets with the University’s Dean, who requests that he leads an arctic expedition to the North Pole, Sheldon asks the guys if they would like to come along. After much consideration, the guys decide to go with him, but they regret it every second during the harsh and cruel training for the extremely cold weather they can be expecting at the North Pole. Meanwhile, Penny hears the news that they’re going away, and decides to show Leonard that she cares about him by knitting him a scarf. However, he believes there may be secret feelings in the scarf, in which she doesn’t want him to go even though she says she will just miss him.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Brian George (1) as Dr. Koothrappali | Alice Amter as Mrs. Koothrappali
Director: Mark Cendrowski

Season 3

41 :03x01 - The Electric Can Opener Fluctuation

Sep/21/2009
The guys are coming home from the North Pole, but only Sheldon is satisfied with the trip, while the rest don’t have very good opinions. Inside their room, Sheldon is shocked to learn that the guys tampered with his data from the experiments he performed, and when nobody seems to understand how sad or furious he is, he leaves to Texas in disgrace. Meanwhile, Penny is more than happy to see that Leonard has come home, and their relationship goes to a whole new level when Penny kisses him incessantly.
Special Guest Stars: Laurie Metcalf as Mary |
Guest Stars: John Ross Bowie as Barry Kripke
Director: Mark Cendrowski

42 :03x02 - The Jiminy Conjecture

Sep/28/2009
It’s comic-book-night for the guys, but they are surprised to see Leonard there. Howard and Raj were expecting him to be having sex with Penny, but as Leonard reveals only to get them off his back, the previous night they spent together was “just fine”. When Sheldon brings this up during a normal conversation, it shocks Penny what Leonard actually tells the guys. Meanwhile, when Howard and Sheldon hear a cricket in the apartment, they start arguing about what species the cricket belongs to, and end up betting their best comic books against each other.
Special Guest Stars: Lewis Black as Professor Crawley
Director: Mark Cendrowski
Writer: Jim Reynolds

43 :03x03 - The Gothowitz Deviation

Oct/05/2009
Sheldon is getting sick of Penny’s misbehavior, and decides to do something about it. He uncovers that Penny has a “thing” for chocolate, and decides to use it in order for her to get a better mood and behavior towards him. Meanwhile, Raj and Howard want to pick up women, and their newest attempt has them dressed like Goths and going to a Goth nightclub, where they try to impress the women, but it doesn’t go flawless.
Guest Stars: Molly Morgan as Bethany | Sarah Buehler as Sarah | Andy MacKenzie as Skeeter
Director: Mark Cendrowski
Songs: Shania Twain -- Man! I Feel Like A Woman

44 :03x04 - The Pirate Solution

Oct/12/2009
It’s a typical day for the boys until Raj runs out of the apartment crying. Howard decides to talk to him and when he comes back, he brings the worst news ever: Raj is getting deported. The only way he can avoid deportation is to get a new job, and he goes as far as agreeing to work for Sheldon in order to remain in the country. Meanwhile, Leonard and Penny try to get some time for themselves, but have to deal with Howard as a third wheel.
Guest Stars: Elizabeth Bogush as Dr. Catherine Millstone | Oliver Muirhead as Professor Laughlin
Director: Mark Cendrowski
Songs: Survivor -- Eye Of The Tiger

45 :03x05 - The Creepy Candy Coating Corollary

Oct/19/2009
Penny loses in a card game, but is surprised when it turns out Sheldon has a special gift in those sorts of games; he can calculate what the opponent’s cards are just from his mind. Afterwards at the comic book store, Sheldon is positively shocked to learn that Wil Wheaton is entering the same card game that Koothrappali is in, and he agrees to be Raj’s partner. Meanwhile, Howard persuades Penny into hooking him up with one of her friends.
Special Guest Stars: Wil Wheaton as Himself (Special Appearance by) |
Guest Stars: Kevin Sussman as Stuart | Melissa Rauch as Bernadette |
Uncredited: Owen Thayer as Lonely Larry | Ian Scott Rudolph as Captain Sweatpants
Director: Mark Cendrowski

46 :03x06 - The Cornhusker Vortex

Nov/02/2009
The guys are going outside to play with kites, but Leonard meets with Penny down the stairs and feels jealous when Penny tells him that she is going to have a friend over and watch football (something Leonard doesn’t understand). However, Leonard discusses the matter with Penny and end up needing to learn the rules of football, but his only choice for help is Sheldon. Meanwhile, during a kite competition between Howard and Raj, Howard leaves to chase a girl, leaving Raj angry at him.
Guest Stars: Zachary Abel as Todd |
Co-Guest Stars: Jason Mesches as Denny
Director: Mark Cendrowski

47 :03x07 - The Guitarist Amplification

Nov/09/2009
Leonard, Penny and Sheldon are playing a game that Sheldon created himself, but there’s more than just the game going on when Leonard and Penny start arguing loudly about Leonard being jealous than Penny’s old “friend” is going to sleep on her couch through the weekend. However, when the anger between Leonard and Penny continue over to Howard and Raj, the whole group is almost divided; Sheldon (the only one not involved in any fight) takes the position of peacemaker.
Guest Stars: Kevin Sussman as Stuart | Carol Ann Susi as Mrs. Wolowitz | Brian George (1) as Dr. Koothrappali | Alice Amter as Mrs. Koothrappali
Director: Mark Cendrowski

48 :03x08 - The Adhesive Duck Deficiency

Nov/16/2009
Leonard, Howard and Raj are on a camping trip in the desert to see the Leonid meteor shower, while Sheldon is at home enjoying the thought of being alone. But his night takes a turn when Penny needs medical help when she fell in the shower and dislocated her shoulder, making Sheldon her only rescue. Meanwhile, the guys in the desert are drunk and accidentally eat their way to being foodless.
Director: Mark Cendrowski
Songs: Kaley Cuoco, Jim Parsons -- Soft Kitty

49 :03x09 - The Vengeance Formulation

Nov/23/2009
Sheldon decides to use his great mind to come up with the perfect prank to pull on Kripke after he was humiliated on National Radio because Kripke had put helium in Sheldon’s office (making his voice girly while on the radio). However, Sheldon uses many attempts, but can’t come up with a great scheme to pull back on Kripke, until a science experiment comes to his mind (which involves dropping lots and lots of foam from the ceiling right down on Kripke while recording the video to YouTube). Meanwhile, Howard is unsure if he wants to continue his relationship with Bernadette when he finds out she wants a commitment while he just wants sex.
Special Guest Stars: Katee Sackhoff as Herself (Special Appearance by) |
Guest Stars: John Ross Bowie as Barry Kripke | Carol Ann Susi as Mrs. Wolowitz | Melissa Rauch as Bernadette |
Co-Guest Stars: Ira Flatow as Himself
Director: Mark Cendrowski

50 :03x10 - The Gorilla Experiment

Dec/07/2009
Howard has regrets about introducing Bernadette to the others when she and Leonard really start to get along; forcing him into an uncomfortable position in which he will do anything to separate them again. Meanwhile, Penny sees the connection between Bernadette and Howard and she wants to learn what Leonard’s job really is about. However, her only choice for help is Sheldon, who isn’t the best teacher for those not so interested in science.
Guest Stars: Melissa Rauch as Bernadette | Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski

51 :03x11 - The Maternal Congruence

Dec/14/2009
Leonard’s mother, Beverly, returns for another visit. Leonard is still not pleased with her coming over, while Sheldon is ecstatic. Penny, however, stresses over the fact that Leonard hasn’t told his mother that he is in a relationship with Penny, and she waits for the perfect moment to tell her, which seems to only be when Beverly becomes drunk for the first time. Meanwhile, Sheldon and Leonard are having friendship issues when it turns out Sheldon has been keeping frequent contact with Beverly while Leonard has been left out.
Special Guest Stars: Christine Baranski as Beverly (Dr. Beverly Hofstadter)
Director: Mark Cendrowski

52 :03x12 - The Psychic Vortex

Jan/11/2010
When Leonard and Howard go on a double date with Penny and Bernadette, Rajesh becomes the fifth wheel, and decides to seek a hook-up going to a university mixer accompanied by Sheldon (who was looking forward to spending his time alone, but was dragged alongside Raj.) However, when they score and get two girls back to their apartment, their week takes an unexpected turn. Meanwhile, Leonard learns that Penny believes in psychics, and his frustration over it causes her to dislike him. The only way Leonard can get Penny back now, is to meet the psychic and see how real it is.
Guest Stars: Melissa Rauch as Bernadette | Danica McKellar as Abby | Jen Drohan as Martha |
Co-Guest Stars: David Trice as Waiter
Director: Mark Cendrowski
Songs: The Guess Who -- American Woman

53 :03x13 - The Bozeman Reaction

Jan/18/2010
Returning from a dinner with the rest of the guys, Leonard and Sheldon are shocked to get back to a robbed apartment. Fearing the criminals will return, Sheldon becomes paranoid and locks himself in his room during the night. Realizing something has to be done, they get help from Howard and Rajesh in order to create a state-of-the-art security system that will attack any criminals that try to enter their apartment in the future. However, the security system can't help Sheldon's paranoid reaction to the breaking-and-entering, causing him to move to Bozeman, Montana, but will he return?
Guest Stars: Julio Oscar Mechoso as Officer Hackett |
Co-Guest Stars: Artie O'Daly as Young Man
Director: Mark Cendrowski

54 :03x14 - The Einstein Approximation

Feb/01/2010
When Sheldon starts suffering from "theorist's block" and can't complete a formula, he becomes depressed and is willing to do anything to find the right answer. He tries several techniques to find the answer, but none of them works, but when he figures out how to figure the answer out, he starts working at the Cheesecake Factory with Penny (much to her dismay). However, it turns out Sheldon is like the perfect employee, even passing Penny in the number of customers.
Guest Stars: Melissa Rauch as Bernadette | Yeardley Smith as Sandy |
Co-Guest Stars: Kevin Brief as Glen
Director: Mark Cendrowski

55 :03x15 - The Large Hadron Collision

Feb/08/2010
After being invited to Switzerland to see the CERN Supercollider, Leonard wants Penny to join him and make it a romantic Valentine's Day getaway. Sheldon becomes shocked that he can't go when he has a far bigger interest in the science, and tries to change Leonard's mind in all sorts of ways. Meanwhile, Leonard fears that no matter which of them he'll pick, the other will be angry and he will lose a friendship... or a relationship.
Director: Mark Cendrowski

56 :03x16 - The Excelsior Acquisition

Mar/01/2010
Ruining his one and only chance at meeting Stan Lee, Sheldon winds up in traffic court because of illegal driving that he did when he drove Penny to the hospital (episode 308). However, as Leonard, Howard and Raj are all going to see Stan Lee, Penny is Sheldon's only hope of avoiding jail.
Special Guest Stars: Stan Lee as Himself (Special Appearance by) |
Guest Stars: Kevin Sussman as Stuart | Steve Paymer as Judge Kirby |
Co-Guest Stars: Marcus Folmar as Guard |
Uncredited: Ian Scott Rudolph as Captain Sweatpants
Director: Peter Chakos

57 :03x17 - The Precious Fragmentation

Mar/08/2010
The guys buy a box of junk at a garage sale and find something precious inside, a prop ring from The Lord of the Rings that causes friend to go against friend.
Guest Stars: Frank Maharajh as Venkatesh
Director: Mark Cendrowski

58 :03x18 - The Pants Alternative

Mar/22/2010
Sheldon wins an award and is reluctant to accept it since he must give a speech before a large crowd. Each of his friends tries to help in his/her own way.
Director: Mark Cendrowski

59 :03x19 - The Wheaton Recurrence

Apr/12/2010
Leonard's relationship with Penny hits rocky water after he utters the "L" word.
Special Guest Stars: Wil Wheaton as Himself (Special Appearance by) |
Guest Stars: Kevin Sussman as Stuart |
Uncredited: Owen Thayer as Lonely Larry | Ian Scott Rudolph as Captain Sweatpants
Director: Mark Cendrowski

60 :03x20 - The Spaghetti Catalyst

May/03/2010
With Leonard and Penny now split-up, Sheldon becomes the peacemaker.
Director: Anthony Rich

61 :03x21 - The Plimpton Stimulation

May/10/2010
Sheldon has a famous female physicist friend stay with he and Leonard and becomes upset when Leonard and his friend become intimate.
Guest Stars: Judy Greer as Elizabeth Plimpton (Dr. Elizabeth Plimpton)
Director: Mark Cendrowski

62 :03x22 - The Staircase Implementation

May/17/2010
Leonard and Sheldon's argument leads to Leonard sleeping on Penny's couch and relating how he met Sheldon. The story of the broken elevator also is revealed.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Ally Maki as Joyce Kim |
Co-Guest Stars: Steven Yeun as Sebastian | Ajgie Kirkland as Louie | Edward Lieberman as Announcer (as Ed Lieberman)
Director: Mark Cendrowski

63 :03x23 - The Lunar Excitation

May/24/2010
Penny realizes that after dating Leonard, she can no longer put up with the guys of limited intelligence that guys she normally dates. Howard and Raj try to find Sheldon a date on the Internet.
Special Guest Stars: Sara Gilbert as Leslie Winkle |
Guest Stars: Mayim Bialik as Amy (Amy Farrah Fowler) | Brian Thomas Smith as Zack |
Co-Guest Stars: Lauri Johnson as Mrs. Gunderson
Director: Peter Chakos

Season 4

64 :04x01 - The Robotic Manipulation

Sep/23/2010
Howard borrows a robotic arm from work and finds himself in a bind, literally. Sheldon goes on a real date with his new friend Amy and Penny helps.
Guest Stars: Mayim Bialik as Amy (Amy Farrah Fowler) | Carol Ann Susi as Mrs. Wolowitz | Vernee Watson-Johnson as Althea
Director: Mark Cendrowski

65 :04x02 - The Cruciferous Vegetable Amplification

Sep/30/2010
Sheldon obsesses over his limited lifespan and takes steps to ensure he will stay alive until it is possible to have his consciousness downloaded into a robot.
Special Guest Stars: Steve Wozniak as Himself (Special Appearance by)
Director: Mark Cendrowski

66 :04x03 - The Zazzy Substitution

Oct/07/2010
Sheldon misses his friendship with Amy and turns to feline companionship, to the dismay of all.
Special Guest Stars: Laurie Metcalf as Mary |
Guest Stars: Mayim Bialik as Amy (Amy Farrah Fowler)
Director: Mark Cendrowski

67 :04x04 - The Hot Troll Deviation

Oct/14/2010
Howard's secret fantasies are revealed while Sheldon and Raj battle at the office.
Special Guest Stars: Katee Sackhoff as Herself (Special Appearance by) | George Takei as Himself (Special Appearance by) |
Guest Stars: Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski

68 :04x05 - The Desperation Emanation

Oct/21/2010
All of the guys have girlfriends except Leonard, even Sheldon, who is anxious to be rid of Amy.
Guest Stars: Mayim Bialik as Amy (Amy Farrah Fowler) | Kevin Sussman as Stuart | Carol Ann Susi as Mrs. Wolowitz | Charlotte Newhouse as Joy |
Co-Guest Stars: Annie O'Donnell as Mrs. Fowler
Director: Mark Cendrowski

69 :04x06 - The Irish Pub Formulation

Oct/28/2010
When Raj's sister comes to town, Leonard rekindles a romance with her and seeks to keep that information secret from Raj with the voluntary help from Sheldon.
Guest Stars: Aarti Mann as Priya
Director: Mark Cendrowski

70 :04x07 - The Apology Insufficiency

Nov/04/2010
Howard's new project requires he get a security clearance and Sheldon's interview during the background check causes trouble.
Guest Stars: Eliza Dushku as Angela (Special Agent Angela Page) |
Co-Guest Stars: Neil deGrasse Tyson as Himself (as Dr. Neil deGrasse Tyson)
Director: Mark Cendrowski

71 :04x08 - The 21-second Excitation

Nov/11/2010
The guys decide to wait in line for a special screening of Raiders Of The Last Ark while the girls pass and have a slumber party.
Special Guest Stars: Wil Wheaton as Himself (Special Appearance by) |
Guest Stars: Eric Andre as Joey |
Uncredited: Ian Scott Rudolph as Captain Sweatpants | Owen Thayer as Lonely Larry
Director: Mark Cendrowski

72 :04x09 - The Boyfriend Complexity

Nov/18/2010
Penny's father shows up and she asks Leonard for help by pretending to still be her boyfriend. Bernadette joins Howard and Raj spend the night using a telescope as part of an astronomy project.
Special Guest Stars: Keith Carradine as Wyatt
Director: Mark Cendrowski

73 :04x10 - The Alien Parasite Hypothesis

Dec/09/2010
A chance encounter with Zack, one of Penny's ex-boyfriends triggers an emotional response in Amy. Howard and Raj compete to decide who is a better superhero.
Guest Stars: Brian Thomas Smith as Zack
Director: Mark Cendrowski

74 :04x11 - The Justice League Recombination

Dec/16/2010
After insulting Zack, Penny's new/old boyfriend, the guys make friends and ask him to help with their entry into a costume contest.
Guest Stars: Kevin Sussman as Stuart | Brian Thomas Smith as Zack |
Uncredited: Ian Scott Rudolph as Captain Sweatpants
Director: Mark Cendrowski

75 :04x12 - The Bus Pants Utilization

Jan/06/2011
Leonard has an idea for a smartphone app but as usual Sheldon wants to take over. After being kicked off the team, Penny tries to play peacemaker.
Director: Mark Cendrowski

76 :04x13 - The Love Car Displacement

Jan/20/2011
The group goes on a road trip to attend a science event and Howard is dismayed when Bernadette encounters an ex.
Guest Stars: Rick Fox as Glenn |
Co-Guest Stars: Edward Lieberman as Announcer
Director: Anthony Rich

77 :04x14 - The Thespian Catalyst

Feb/03/2011
Sheldon turns to Penny for acting lessons as a way to improve as a teacher. Raj has inappropriate fantasies about Bernadette.
Director: Mark Cendrowski

78 :04x15 - The Benefactor Factor

Feb/10/2011
The guys attend a formal dinner to try to persuade wealthy patrons to donate to the physics department. Leonard has to decide how far he will go when a particular donor shows an interest in him.
Special Guest Stars: Jessica Walter as Mrs. Latham |
Guest Stars: Joshua Malina as President Siebert
Director: Mark Cendrowski

79 :04x16 - The Cohabitation Formulation

Feb/17/2011
Howard and Bernadette consider moving in together; Leonard resumes dating Raj's sister, over Raj's vehement objections.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Aarti Mann as Priya
Director: Mark Cendrowski

80 :04x17 - The Toast Derivation

Feb/24/2011
Sheldon decides to invite new friends over when Leonard and the rest of the gang move their gatherings to Raj's place.
Special Guest Stars: LeVar Burton as Himself |
Guest Stars: Kevin Sussman as Stuart | Brian Thomas Smith as Zack | John Ross Bowie as Barry Kripke | Aarti Mann as Priya
Director: Mark Cendrowski

81 :04x18 - The Prestidigitation Approximation

Mar/10/2011
Priya asks Leonard to choose between her and his friendship with Penny. Howard shows Sheldon a magic trick that Sheldon is determined to figure out.
Guest Stars: Aarti Mann as Priya
Director: Mark Cendrowski

82 :04x19 - The Zarnecki Incursion

Mar/31/2011
After Sheldon's World of Warcraft account is hacked, the guys take it upon themselves to confront the culprit.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Aarti Mann as Priya | Lanny Joon as Officer Shin | Christopher Douglas Reed as Todd Zarnecki
Director: Peter Chakos

83 :04x20 - The Herb Garden Germination

Apr/07/2011
Sheldon and Amy spread gossip about various members of the group as a social experiment. Howard must decide whether to pop the question to Bernadette.
Guest Stars: Aarti Mann as Priya | Brian George (1) as Dr. Koothrappali | Alice Amter as Mrs. Koothrappali |
Co-Guest Stars: Brian Greene (2) as Himself
Director: Mark Cendrowski

84 :04x21 - The Agreement Dissection

Apr/28/2011
Priya's increased presence at Leonard and Sheldon's apartment causes changes that Sheldon struggles with. To relax, he accompanies Penny and the girls on a night out with dancing.
Guest Stars: Aarti Mann as Priya | Arnold Chun as Ho-Jun |
Co-Guest Stars: Tom Yi as Dispatcher
Director: Mark Cendrowski

85 :04x22 - The Wildebeest Implementation

May/05/2011
Amy convinces Penny and Bernadette to use Bernadette as an undercover informant on Leonard and Priya's relationship. Raj decides to try out a new drug to cure his social anxiety disorder, but the results are less than satisfactory.
Guest Stars: Aarti Mann as Priya | Tiffany DuPont as Angela |
Co-Guest Stars: Whitney Avalon as Elsie
Director: Mark Cendrowski

86 :04x23 - The Engagement Reaction

May/12/2011
Howard musters up the courage to tell his mother that he is going to marry Bernadette. The news doesn't sit well and she ends up in the hospital.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Aarti Mann as Priya | Phil Abrams as Dr. Bernstein |
Co-Guest Stars: Sharon Omi as Nurse in Biohazard Suit
Director: Howard Murray

87 :04x24 - The Roommate Transmogrification

May/19/2011
Bernadette becomes the latest person in the group to receive her Ph.D., which leads to Howard being teased about his lack of the same. When Leonard starts spending the night with Raj's sister, Raj resorts to becoming a temporary roommate of Sheldon's.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Aarti Mann as Priya | Brian George (1) as Dr. Koothrappali | Alice Amter as Mrs. Koothrappali
Director: Mark Cendrowski

Season 5

88 :05x01 - The Skank Reflex Analysis

Sep/22/2011
Penny must deal with the aftermath of her night with Raj and how it affects her friendship with the guys. Sheldon names himself captain of the paintball team and tries to assert his leadership.
Special Guest Stars: Christine Baranski as Beverly (Dr. Beverly Hofstadter) |
Guest Stars: Stacey Travis as Sandy
Director: Mark Cendrowski

89 :05x02 - The Infestation Hypothesis

Sep/22/2011
Sheldon insists Penny rid her apartment of a piece of "found" furniture and tries to use Amy as a go between. Leonard and Priya try to make their long distance relationship with spicy video chats.
Guest Stars: Aarti Mann as Priya | Brian George (1) as Dr. Koothrappali | Alice Amter as Mrs. Koothrappali
Director: Mark Cendrowski

90 :05x03 - The Pulled Groin Extrapolation

Sep/29/2011
Leonard accompanies Amy as her date to a wedding and ends up having fun in spite of himself. Bernadette tries spending the weekend with Howard and his mother in their house.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski

91 :05x04 - The Wiggly Finger Catalyst

Oct/06/2011
Raj is so depressed he is alone so Penny finds him a girl he can talk to, so to speak.
Guest Stars: Katie LeClerc as Emily | Brian George (1) as Dr. Koothrappali | Alice Amter as Mrs. Koothrappali
Director: Mark Cendrowski

92 :05x05 - The Russian Rocket Reaction

Oct/13/2011
Sheldon's arch nemesis invites the guys to a party at his house and Leonard decides to go, angering Sheldon. Howard gets the opportunity of a lifetime but his decision doesn't sit well with Bernadette.
Special Guest Stars: Wil Wheaton as Himself (Special Appearance by) |
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Kevin Sussman as Stuart |
Uncredited: Brent Spiner as Himself
Director: Mark Cendrowski

93 :05x06 - The Rhinitis Revelation

Oct/20/2011
Sheldon's mom comes to town for a visit and Sheldon is angry that she doesn't want to cook and spend all her time with him. Instead, she chooses to spend most of her time with Leonard and the rest of the gang as they show her the town.
Special Guest Stars: Laurie Metcalf as Mary
Director: Howard Murray

94 :05x07 - The Good Guy Fluctuation

Oct/27/2011
Leonard is tempted to stray on Priya when a cute girl comes on to him at the comic book store. The guys pull a Halloween prank on Sheldon and he vows revenge.
Guest Stars: Kevin Sussman as Stuart | Aarti Mann as Priya | Courtney Ford as Alice
Director: Mark Cendrowski

95 :05x08 - The Isolation Permutation

Nov/03/2011
Sheldon must suffer the responsibility to comfort Amy when Penny and Bernadette exclude her from their pre-wedding shopping.
Director: Mark Cendrowski

96 :05x09 - The Ornithophobia Diffusion

Nov/10/2011
Leonard and Penny decide to spend a night out just being friends. Sheldon freaks out when a bird haunts the apartment.
Guest Stars: Blake Berris as Kevin | Ashley Austin Morris as Laura
Director: Mark Cendrowski

97 :05x10 - The Flaming Spittoon Acquisition

Nov/17/2011
Sheldon must step up his game with Amy when she decides to go out with Stuart from the comic book store.
Guest Stars: Kevin Sussman as Stuart | Josh Brener as Dale
Director: Mark Cendrowski

98 :05x11 - The Speckerman Recurrence

Dec/08/2011
To Leonard's surprise, a bully from his high school days and his own personal tormentor gets in touch with him and Leonard must decide on a course of action. The girls try to help Penny make amends for her own history of being a bully.
Guest Stars: Lance Barber as Jimmy (Jimmy Speckerman)
Director: Anthony Rich

99 :05x12 - The Shiny Trinket Maneuver

Jan/12/2012
Amy is upset with Sheldon and his dismissal of her career accomplishments. Howard is dismayed by Bernadette's apparent disinterest in kids.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Jonathan Schmock as Jonathan |
Co-Guest Stars: Jadon Sand as Aaron | Dusan Brown as Jeremy
Director: Mark Cendrowski

100 :05x13 - The Recombination Hypothesis

Jan/19/2012
Out of the blue, Leonard invites Penny out on a date and they struggle with what it means.
Co-Guest Stars: Jim Turner (2) as Reverend White
Director: Mark Cendrowski

101 :05x14 - The Beta Test Initiation

Jan/26/2012
Leonard proposes that he and Penny treat their dating like software development and report "bugs" to each other. Raj gets a new phone, and falls in love with the AI contained within.
Guest Stars: John Ross Bowie as Barry Kripke | Becky O'Donohue as Siri |
Co-Guest Stars: Kevin Brief as Security Guard
Director: Mark Cendrowski

102 :05x15 - The Friendship Contraction

Feb/02/2012
Leonard finally tires of Sheldon's thankless demands on him and breaks the friendship agreement. Howard and Raj brainstorm a way to make the other NASA astronauts pick a cool nickname for Howard.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Kevin Sussman as Stuart |
Co-Guest Stars: Michael J. Massimino as Himself (as Mike Massimino)
Director: Mark Cendrowski
Songs: Elton John -- Rocket Man

103 :05x16 - The Vacation Solution

Feb/09/2012
Sheldon's is required to take some vacation time away from work, and Amy pays the price. A pre-nuptial agreement rears its ugly head between Howard and Bernadette.
Guest Stars: Joshua Malina as President Siebert |
Co-Guest Stars: Nick Clifford as Phil
Director: Mark Cendrowski
Songs: Black Eyed Peas -- I Gotta Feeling

104 :05x17 - The Rothman Disintegration

Feb/16/2012
Sheldon and his nemesis Kripke both want an office that becomes available with the retirement of a senior physicist. Amy gives Penny a heartfelt gift that Penny abhors, but how does she tell Amy without hurting her?
Guest Stars: Joshua Malina as President Siebert |
Co-Guest Stars: John Ross Bowie as Barry Kripke | Lynn Seibel as Professor Rothman (as Lynn Phillip Seibel)
Director: Mark Cendrowski

105 :05x18 - The Werewolf Transformation

Feb/23/2012
When Sheldon's barber becomes unavailable due to illness, it starts the descent of his orderly life into chaos. Astronaut training proves more difficult for Howard than expected.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Vernee Watson-Johnson as Althea | Peter Onorati as Angelo
Director: Mark Cendrowski
Songs: Bon Jovi -- Wanted Dead or Alive

106 :05x19 - The Weekend Vortex

Mar/08/2012
The guys decide to spend the weekend playing video games like they used to. The women in their life have other ideas however, especially Amy who is counting on Sheldon accompanying her to a family event.
Guest Stars: Kevin Sussman as Stuart | Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski

107 :05x20 - The Transporter Malfunction

Mar/29/2012
Raj finally gives up and asks his parents for help to find a wife. Sheldon's conscience causes him to hear his toy Spock doll speak to him.
Guest Stars: Brian George (1) as Dr. Koothrappali | Alice Amter as Mrs. Koothrappali | Chriselle Almeida as Lakshmi |
Uncredited: Leonard Nimoy as Spock
Director: Mark Cendrowski

108 :05x21 - The Hawking Excitation

Apr/05/2012
Howard takes advantage of Sheldon's obsession to meet visiting professor Stephen Hawking by putting him through the ringer.
Special Guest Stars: Stephen Hawking as Himself (Special Appearance by) |
Guest Stars: Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski

109 :05x22 - The Stag Convergence

Apr/26/2012
Howard's bachelor party results in Bernadette learning things about Howard's past that makes her reconsider marrying him.
Special Guest Stars: Wil Wheaton as Himself (Special Appearance by) |
Guest Stars: Kevin Sussman as Stuart | John Ross Bowie as Barry Kripke |
Uncredited: Ian Scott Rudolph as Captain Sweatpants
Director: Peter Chakos

110 :05x23 - The Launch Acceleration

May/03/2012
Howard's mission into space gets rescheduled sooner, creating a conflict with the wedding. Leonard and Penny resume their physical relationship until Leonard says something he shouldn't in the boudoir. Amy uses psychology on Sheldon to bring them closer together.
Guest Stars: Casey Sander as Mr. Rostenkowski |
Co-Guest Stars: Karl T. Wright as Jimmy | Robert Clotworthy as Dave Roeger
Director: Mark Cendrowski

111 :05x24 - The Countdown Reflection

May/10/2012
Bernadette decides she wants to be married to Howard before his mission to space. The gang scrambles to get it done.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Casey Sander as Mr. Rostenkowski | Pavel Lychnikoff as Dimitri (as Pasha Lychnikoff) |
Co-Guest Stars: Michael J. Massimino as Himself (as Mike Massimino) | Amy Tolsky as Joan | Endre Hules as Russian Mission Control
Director: Mark Cendrowski

Season 6

112 :06x01 - The Date Night Variable

Sep/27/2012
With everyone paired up, Raj is left alone and imposes himself on others. Howard cannot escape the two women in his life, even while on the space station.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Pavel Lychnikoff as Dimitri
Director: Mark Cendrowski

113 :06x02 - The Decoupling Fluctuation

Oct/04/2012
Penny confides to Amy and Bernadette that she is unsure about staying with Leonard, and when Sheldon inevitably learns about it, he takes matters into his own hands. Howard gets pranked as the new guy in space.
Guest Stars: Pavel Lychnikoff as Dimitri |
Co-Guest Stars: Michael J. Massimino as Himself
Director: Mark Cendrowski

114 :06x03 - The Higgs Boson Observation

Oct/11/2012
Sheldon hires a young woman to be his assistant, which initially makes Amy jealous, then later Penny finds cause for concern. On the space station, Howard starts to freak out when he learns his return to Earth will be delayed.
Guest Stars: Pavel Lychnikoff as Dimitri | Margo Harshman as Alex (Alex Jensen)
Director: Mark Cendrowski

115 :06x04 - The Re-Entry Minimization

Oct/18/2012
Howard is home, but on his first night back Bernadette gets sick so he decides to visit his friends. His reception is not what he expected. Game Night with Sheldon, Leonard, Penny and Amy takes a competitive turn when the girls take on the guys.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Pavel Lychnikoff as Dimitri | Ken Lerner as Dr. Schneider | Jan Hoag as Lilian | John Mendoza as Chauffeur |
Co-Guest Stars: Michael J. Massimino as Himself |
Uncredited: Howie Mandel as Himself
Director: Mark Cendrowski
Songs: Elton John -- Rocket Man

116 :06x05 - The Holographic Excitation

Oct/25/2012
Raj and Stuart throw a Halloween bash at the comic book store. Howard is upset when everyone tires of his stories about life on the space station. Leonard shows Penny his laboratory and is surprised by her reaction.
Special Guest Stars: Buzz Aldrin as Himself (Special Appearance by) |
Co-Guest Stars: Janelle Giumarra as Claire (as Janelle Marra)
Director: Mark Cendrowski

117 :06x06 - The Extract Obliteration

Nov/01/2012
Penny reveals that she is taking a class at the local community college, but insists it is no big deal. Sheldon plays an Internet game with his idol, Stephen Hawking, then frets when Hawking stops playing.
Guest Stars: Stephen Hawking as Himself
Director: Mark Cendrowski

118 :06x07 - The Habitation Configuration

Nov/08/2012
Bernadette puts her foot down about Howard moving out of his mom's house. Sheldon is perplexed with the enmity between Amy and his friend Wil Wheaton and has no clue how to fix it.
Special Guest Stars: Wil Wheaton as Himself (Special Appearance by) | LeVar Burton as Himself |
Guest Stars: Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski

119 :06x08 - The 43 Peculiarity

Nov/15/2012
Howard is curious why Sheldon disappears every day at 2:45 and asks Raj to help him discover the secret. Penny's new school partner causes Leonard to be jealous.
Guest Stars: Margo Harshman as Alex (Alex Jensen) | Ryan Cartwright as Cole
Director: Mark Cendrowski

120 :06x09 - The Parking Spot Escalation

Nov/29/2012
The University decides to reassign Sheldon's unused parking space to the newly popular Howard, a move that Sheldon feels is a slap in the face to his importance. This starts a feud between the two friends that spills over to their ladies, and Penny pays the price.
Guest Stars: William Stanford Davis as Dry Cleaner
Director: Peter Chakos

121 :06x10 - The Fish Guts Displacement

Dec/06/2012
When Amy gets sick, Sheldon is required to take care of her and she milks it for all it's worth. Bernadette arranges for Howard and her father to bond via a fishing trip.
Guest Stars: Casey Sander as Mr. Rostenkowski (Mike) | Meagen Fay as Mrs. Rostenkowski
Director: Mark Cendrowski
Songs: Katrina & The Waves -- Walking on Sunshine

122 :06x11 - The Santa Simulation

Dec/13/2012
Leonard leads the boys on a Christmasy version of Dungeons and Dragons, while Raj joins the girls on their night out and they try to find him a girl.
Guest Stars: Dakin Matthews as Santa
Director: Mark Cendrowski

123 :06x12 - The Egg Salad Equivalency

Jan/03/2013
Sheldon manages to put his foot in his mouth and ends up being accused of sexual harassment. In typical fashion, he throws his friends under the bus too.
Special Guest Stars: Regina King as Mrs. Davis |
Guest Stars: Margo Harshman as Alex (Alex Jensen)
Director: Mark Cendrowski

124 :06x13 - The Bakersfield Expedition

Jan/10/2013
The guys head out to a comic book convention and get stranded in full costume. The girls decide to try to understand their men and end up in a heated debate over a comic book character.
Guest Stars: Matt Battaglia as Officer Reynolds | Angela Sargeant as Lana |
Co-Guest Stars: Craig Gellis as Car Thief #1 | Frank Alvarez as Car Thief #2 | Rick Gifford as Guy |
Uncredited: Ian Scott Rudolph as Captain Sweatpants
Director: Mark Cendrowski

125 :06x14 - The Cooper/Kripke Inversion

Jan/31/2013
After being forced to team up with Barry Kripke by management, Sheldon is dismayed when he discovers his work is not up to par with Kripke's. Howard and Raj spare no expense to get action figures that look like themselves.
Guest Stars: John Ross Bowie as Barry Kripke
Director: Mark Cendrowski

126 :06x15 - The Spoiler Alert Segmentation

Feb/07/2013
Leonard finally has enough of Sheldon and moves out, to Penny's distress. Amy takes advantage of Sheldon's need for a new roommate, to Sheldon's distress. While Howard is away, Raj agrees to look in on Mrs. Wolowitz, to his distress!
Guest Stars: Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski

127 :06x16 - The Tangible Affection Proof

Feb/14/2013
The three couples celebrate Valentine's day in their own way, with little success while Raj and Stuart throw a party for their unattached friends.
Guest Stars: Kevin Sussman as Stuart | Margo Harshman as Alex (Alex Jensen) | Josh Brener as Dale | Kate Micucci as Lucy |
Co-Guest Stars: Briana Cuoco as Gretchen
Director: Mark Cendrowski

128 :06x17 - The Monster Isolation

Feb/21/2013
When Raj gets dumped again, he decides to never leave his apartment or have anything to do with girls. Penny uses her acting skills to help Sheldon with his "Fun With Flags" videos.
Guest Stars: Kevin Sussman as Stuart | Kate Micucci as Lucy |
Co-Guest Stars: Riccardo Lebron as Tom
Director: Mark Cendrowski

129 :06x18 - The Contractual Obligation Implementation

Mar/07/2013
While Leonard, Sheldon, and Howard try to motivate middle school girls to pursue a career in science, the ladies play hooky and go to Disneyland. Raj has a first date with Lucy.
Guest Stars: Kate Micucci as Lucy | Brian Posehn as Bert | Piper MacKenzie Harris as Girl #1 |
Co-Guest Stars: Diamond White as Girl #2 | Dawson Fletcher as Justin
Director: Mark Cendrowski

130 :06x19 - The Closet Reconfiguration

Mar/14/2013
Howard and Bernadette trick Sheldon into organizing their closet where he finds an unopened letter from Howard's father. Howard then struggles whether or not to read it.
Director: Anthony Rich

131 :06x20 - The Tenure Turbulence

Apr/04/2013
A tenured position becomes available at the University and Leonard, Sheldon and Raj all decide to apply, each with their own unique style of currying favor.
Special Guest Stars: Regina King as Mrs. Davis |
Guest Stars: John Ross Bowie as Barry Kripke
Director: Mark Cendrowski

132 :06x21 - The Closure Alternative

Apr/25/2013
Raj's curiosity about his new love interest leads him to discover something to make him change the impression he makes on people. Meanwhile Penny worries that she lacks passion about anything and Amy tries to cure Sheldon of his completion compulsion.
Guest Stars: Kate Micucci as Lucy
Director: Mark Cendrowski

133 :06x22 - The Proton Resurgence

May/02/2013
Sheldon learns that his childhood television idol, Professor Proton, is still alive and hiring himself out for parties, so of course Sheldon hires him to perform. Raj is away for the weekend so he asks Howard and Bernadette to look after his dog, with the expected result.
Special Guest Stars: Bob Newhart as Arthur (Professor Proton) |
Guest Stars: Troy Winbush as Paramedic
Director: Mark Cendrowski
Songs: Jim Parsons -- Soft Kitty

134 :06x23 - The Love Spell Potential

May/09/2013
The girls join the boys in a game of Dungeons & Dragons after their trip to Las Vegas falls through. Raj and Lucy continue their dating adventures and Raj pushes Lucy to confront one of her greatest fears.
Guest Stars: Kate Micucci as Lucy | David Trice as Waiter
Director: Anthony Rich

135 :06x24 - The Bon Voyage Reaction

May/16/2013
Leonard gets an opportunity to work with Dr. Stephen Hawking, but the downside is it will mean being away for up to four months. Both Penny and Sheldon are affected tremendously and both try to come to terms with their feelings while still supporting Leonard. Raj risks everything with Lucy when he pushes her too hard and too fast.
Guest Stars: Kate Micucci as Lucy
Director: Mark Cendrowski

Season 7

136 :07x01 - The Hofstadter Insufficiency

Sep/26/2013
Sheldon and Penny commiserate over their mutual sadness of Leonard's absence. Howard encourages Raj to start looking for another girlfriend and is surprised at who he chooses. Amy & Bernadette are away at a conference and bond/clash when they talk about their relationships.
Special Guest Stars: Regina King as Mrs. Davis |
Co-Guest Stars: Sophie Tamiko Oda as Grace (as Sophie Oda) | Aaron Takahashi as Scientist | Alex Ball as Waiter
Director: Mark Cendrowski

137 :07x02 - The Deception Verification

Sep/26/2013
Leonard arrives home early and chooses not to tell Sheldon. Howard's unusual behavior results from an unlikely source.
Guest Stars: Kevin Sussman as Stuart |
Co-Guest Stars: Barak Hardley as Pizza Delivery Guy
Director: Mark Cendrowski

138 :07x03 - The Scavenger Vortex

Oct/03/2013
After the entire gang passes on Raj's dinner party, he designs a scavenger hunt that brings out unknown personality traits in his friends.
Guest Stars: Kevin Sussman as Stuart
Director: Mark Cendrowski
Songs: Neil Diamond -- America, Neil Diamond -- Cherry, Cherry, Neil Diamond -- Love On The Rocks, Neil Diamond -- Sweet Caroline

139 :07x04 - The Raiders Minimization

Oct/10/2013
Sheldon looks to exact revenge from Amy after she ruins Raiders of The Lost Ark by revealing a plot hole. Leonard uses guilt as leverage over Penny, and Raj and Stuart try the Internet to find a date.
Special Guest Stars: Christine Baranski as Beverly |
Guest Stars: Kevin Sussman as Stuart |
Co-Guest Stars: Christine Corpuz as Woman
Director: Mark Cendrowski
Songs: London Symphony Orchestra -- The Raiders March, John Williams (3) -- The Raiders March

140 :07x05 - The Workplace Proximity

Oct/17/2013
When Amy starts working at the same university as Sheldon, friction between the pair spreads to Howard and Bernadette.
Co-Guest Stars: Todd Eric Andrews as Dr. Gunderson | Ayumi Iizuka as Scientist
Director: Mark Cendrowski

141 :07x06 - The Romance Resonance

Oct/24/2013
Sheldon is insufferable after making a major scientific discovery, or did he? Howard plans an elaborate romantic celebration for Bernadette and Penny decides she needs to do something for Leonard.
Co-Guest Stars: Tom Fonss as Student
Director: Mark Cendrowski
Songs: The Big Bang Theory Choir -- Bernadette

142 :07x07 - The Proton Displacement

Nov/07/2013
A chance encounter with Professor Proton ends up hurting Sheldon's feelings when his childhood hero looks to Leonard for professional advice. Raj's special bonding time with the girls is hijacked by Howard.
Special Guest Stars: Bob Newhart as Arthur (Professor Proton) |
Guest Stars: Bill Nye as Himself
Director: Mark Cendrowski

143 :07x08 - The Itchy Brain Simulation

Nov/14/2013
Leonard uncovers a situation that he is sure will make Sheldon "freak-out", but Sheldon comes up with a compromise that ends up punishing Leonard. Penny encounters Raj's ex-girlfriend and can't help herself from intruding into his love life.
Guest Stars: Kate Micucci as Lucy | Morgan Hewitt as Lizzy
Director: Mark Cendrowski

144 :07x09 - The Thanksgiving Decoupling

Nov/21/2013
Howard invites everyone to his mother's house for Thanksgiving where unexpected drama emerges from Penny's past and Howard's father-in-law bonds with an unlikely person.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Casey Sander as Mr. Rostenkowski | Brian Thomas Smith as Zack
Director: Mark Cendrowski

145 :07x10 - The Discovery Dissipation

Dec/05/2013
Sheldon's disgust at his accidental discovery and subsequent fame reach a level that compels Leonard and Amy to try to mollify him. Raj needs a temporary place to stay for a week so Howard invites him to stay with he and Bernadette.
Special Guest Stars: Wil Wheaton as Himself (Special Appearance by) |
Guest Stars: John Ross Bowie as Barry Kripke |
Co-Guest Stars: Ira Flatow as Himself (as Ira Faltow)
Director: Mark Cendrowski

146 :07x11 - The Cooper Extraction

Dec/12/2013
Sheldon goes home to Texas to be with his family during the birth of his sister's baby and the gang reminisces about what their life would be life if they never met him.
Special Guest Stars: Laurie Metcalf as Mary |
Guest Stars: Kevin Sussman as Stuart | Carol Ann Susi as Mrs. Wolowitz | Brian Thomas Smith as Zack
Director: Mark Cendrowski

147 :07x12 - The Hesitation Ramification

Jan/02/2014
Penny finally gets her big break, or does she? Her reaction leads her to make Leonard an offer that is difficult for him to accept. Sheldon tries to quantize humor while Raj and Stuart go to the mall to practice talking to girls.
Guest Stars: Kevin Sussman as Stuart |
Co-Guest Stars: Marcus Folmar as Security Guard
Director: Mark Cendrowski

148 :07x13 - The Occupation Recalibration

Jan/09/2014
Penny takes a drastic step to further her career. While Leonard says he supports her decision, he has his doubts. Sheldon is forced to take some vacation time and ends up hanging with Penny. While Amy fends off an unwanted suitor, Bernadette tries to find a replacement comic book she accidentally damaged.
Guest Stars: Josh Peck as Jesse | Kevin Sussman as Stuart | Brian Posehn as Bert |
Co-Guest Stars: Ian Scott Rudolph as Captain Sweatpants | Edward Lieberman as Man
Director: Mark Cendrowski

149 :07x14 - The Convention Conundrum

Jan/30/2014
The guys fail to get tickets to Comic-Con and debate whether to buy them from a scalper. Sheldon refuses to and decides to start his own comic book convention and he targets James Earl Jones as a potential panelist. While the guys are occupied with "childish" endeavors, the ladies decide to do something "grown-up".
Special Guest Stars: James Earl Jones as Himself | Carrie Fisher as Herself (Special Appearance by)
Director: Mark Cendrowski

150 :07x15 - The Locomotive Manipulation

Feb/06/2014
Amy treats Sheldon to a train trip as incentive for a romantic Valentine's Day getaway. Raj leaves his dog in the not so capable hands of Penny and Leonard.
Guest Stars: Tania Raymonde as Yvette | Eric Petersen as Eric | Alex Ball as Waiter
Director: Mark Cendrowski

151 :07x16 - The Table Polarization

Feb/27/2014
At Penny's urging, Leonard stands up to Sheldon and buys a dining room table while Howard and Bernadette contemplate a return to the space station for Howard.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Casey Sander as Mr. Rostenkowski | Christopher Neiman as Dr. Dreyfus |
Co-Guest Stars: Michael J. Massimino as Himself
Director: Gay Linvill

152 :07x17 - The Friendship Turbulence

Mar/06/2014
Howard takes Bernadette's comments seriously about he and Sheldon's bickering and invites Sheldon to fly with him to NASA at Houston. Penny's career luck continues its downward slide while Raj asks Amy to be his wingman on an online dating service.
Guest Stars: Laura Spencer as Emily |
Co-Guest Stars: Gilda Stratton as Flight Attendant
Director: Mark Cendrowski

153 :07x18 - The Mommy Observation

Mar/13/2014
Sheldon decides to surprise his mother with a visit since he is already in Texas with Howard, but he is the one who gets the big surprise. Raj puts on another of his dinner parties that leads to some conflict within the group.
Special Guest Stars: Laurie Metcalf as Mary |
Guest Stars: Kevin Sussman as Stuart
Director: Mark Cendrowski

154 :07x19 - The Indecision Amalgamation

Apr/03/2014
An episode about choices: Raj is faced with the possibility of dating two women; Penny must decide whether to take a role in a bad movie; Sheldon must choose between buying an X-Box One or PS4.
Special Guest Stars: Wil Wheaton as Himself (Special Appearance By) |
Guest Stars: Laura Spencer as Emily |
Co-Guest Stars: Fernando Rivera as Salesperson | Rod Keller as Wardrobe Person
Director: Anthony Rich

155 :07x20 - The Relationship Diremption

Apr/10/2014
Sheldon comes to the depressing realization that is life long research into string theory has been for naught. Howard and Bernadette join Raj and his new girlfriend Emily on a double date, which turns out to be a night Howard would just as soon forget.
Guest Stars: John Ross Bowie as Kripke (Barry Kripke) | Laura Spencer as Emily | Stephen Hawking as Himself |
Co-Guest Stars: Phyllis Timbes as Voicemail
Director: Mark Cendrowski

156 :07x21 - The Anything Can Happen Recurrence

Apr/24/2014
Penny encourages a return to "Anything Can Happen Thursdays" as a way of getting Sheldon's mind off his career funk. Amy and Bernadette get caught in a lie while Howard helps Raj prepare for his date night with Emily.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Laura Spencer as Emily | Kimberly Hebert-Gregory as Ms. Davora
Director: Mark Cendrowski

157 :07x22 - The Proton Transmogrification

May/01/2014
The loss of Sheldon's idol Professor Proton provokes feelings that Sheldon cannot seem to process. Leonard enjoys torturing Penny about their numerous marriage proposals while Amy and Bernadette decide to make a surprise to help celebrate "Star Wars Day."
Special Guest Stars: Bob Newhart as Arthur (Professor Proton)
Director: Mark Cendrowski

158 :07x23 - The Gorilla Dissolution

May/08/2014
Penny's role in the gorilla movie leads her to rethink the choices she has made, both in her career and her life. Howard and Bernadette care for an injured Mrs. Wolowitz, a dry run for a potential child down the road while Raj seeks advice from Sheldon when he sees Emily on a date with another man.
Special Guest Stars: Wil Wheaton as Himself (Special Appearance by) |
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Laura Spencer as Emily | Steve Valentine as Kenneth |
Co-Guest Stars: Beau Casper Smart as Travis | Kaliko Kauahi as Marta
Director: Peter Chakos

159 :07x24 - The Status Quo Combustion

May/15/2014
The realization of Leonard and Penny's engagement and future without him suddenly sinks in to Sheldon, and the stress it adds to his already failing career induces panic. Meanwhile, Howard and Bernadette desperately search for assistance caring for Howard's mother.
Special Guest Stars: Christine Baranski as Beverly |
Guest Stars: Carol Ann Susi as Mrs. Wolowitz (Debbie) | Kevin Sussman as Stuart |
Co-Guest Stars: Monica Garcia as Maria
Director: Mark Cendrowski

Season 8

160 :08x01 - The Locomotion Interruption

Sep/22/2014
• No Summary (Add Here)

161 :08x02 - Season 8, Episode 2

Sep/22/2014
• No Summary (Add Here)

162 :08x03 - Season 8, Episode 3

Sep/29/2014
• No Summary (Add Here)
Warning: The Big Bang Theory guide may contain spoilers
Classification: Scripted
Genre: Comedy
Status: Returning Series
Network: CBS ( USA)
Airs: Thursdays at 08:00 pm
Runtime: 30 Minutes
Premiere: September 24, 2007
Episode Order: 24
This guide is currently edited by:
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