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(Change Layout)The Big Bang Theory  
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« Season 1   Settings    All Season (Printable Guide) Season 3 »
S-1 | S-2 | S-3 | All

Season 1
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 blond 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 (1) as Kurt, Vernee Watson-Johnson as Althea
Director: James Burrows (1)
Writer: Bill Prady, Chuck Lorre
Songs: (Unknown artist) -- 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
Story: Bill Prady, Chuck Lorre | Teleplay: Robert Cohen (1), David Goetsch
 
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.
Guest Stars: Allen Nabors as Doug, Sara Gilbert as Leslie Winkle, Sherry Weston as Instructor, Treisa Gary as Waitress
Director: Mark Cendrowski
Story: Chuck Lorre | Teleplay: Steven Molaro, Bill Prady
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.
Guest Stars: Mark Harelik as Dr. Eric Gablehauser, Laurie Metcalf as Mary, Sierra Edwards as Summer
Director: Mark Cendrowski
Story: Bill Prady, Chuck Lorre | Teleplay: Lee Aronsohn, David Litt
 
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.
Guest Stars: Sara Gilbert as Leslie Winkle
Director: Andrew D. Weyman
Story: Jennifer Glickman | Teleplay: Steven Molaro, David Goetsch
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.
Starring Roles: Cynthia Holloway as Roberta, Erin Allin O'Reilly as Cheryl, Kimberly Kevon Williams as Vicki, | Guest Stars: Brian Patrick Wade (1) as Kurt, Rachel Cannon as Patty
Director: Mark Cendrowski
Story: David Goetsch | Teleplay: David Litt, Robert Cohen (1)
 
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, Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski
Story: Chuck Lorre, Bill Prady | Teleplay: Jennifer Glickman, Lee Aronsohn
 
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: Alice Amter as Mrs. Koothrappali, Brian George (2) as Dr. Koothrappali, Sarayu Rao as Lalita
Director: Ted Wass
Story: Steven Molaro, David Goetsch | Teleplay: Robert Cohen (1), Lee Aronsohn
Songs: Jim Parsons -- 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.
Guest Stars: Talbott Chin as Chinese Leonard, Howard Chan as Chinese Sheldon
Director: Joel Murray
Story: Bill Prady, Stephen Engel | Teleplay: Chuck Lorre
 
10 :01x10 - The Loobenfeld Decay (Mar/24/2008)
While discussing something while walking up the stairs to their apartment, Leonard and Sheldon hear Penny’s awful singing. 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: D. J. Qualls as Toby Loobenfeld
Director: Mark Cendrowski
Story: Chuck Lorre | Teleplay: Bill Prady, Lee Aronsohn
 
11 :01x11 - The Pancake Batter Anomaly (Mar/31/2008)
Leonard and Sheldon are playing 3-D 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.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz, Erin Allin O'Reilly as Cheryl
Director: Mark Cendrowski
Story: Chuck Lorre, Lee Aronsohn | Teleplay: Bill Prady
 
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 loses his focus.
Guest Stars: Emma Degerstedt as Emma, Joel Brooks (1) as Professor Goldfarb, Austin Lee as Dennis Kim, Mark Harelik as Dr. Eric Gablehauser
Director: Mark Cendrowski
Story: Jennifer Glickman, Stephen Engel | Teleplay: Steven Molaro, David Goetsch
 
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, 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, the guys request Leslie Winkle to accept being on their team, something that she agrees to do. 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.
Guest Stars: Sergio Enrique as Son, Sandra Marquez as Woman, Adam Gregor as Dimitri, Mark Harelik as Dr. Eric Gablehauser, Sara Gilbert as Leslie Winkle
Director: Mark Cendrowski
Story: Stephen Engel, Jennifer Glickman | Teleplay: Bill Prady
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 (1) as Mike
Director: Mark Cendrowski
Story: Bill Prady | Teleplay: Stephen Engel, Steven Molaro
 
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 Raj 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, Chuck Carter as Stan, Ronald Hunter as Dan, Judith Moreland as Jan
Director: Mark Cendrowski
Story: Bill Prady | Teleplay: Steven Molaro, David Goetsch
 
17 :01x17 - The Tangerine Factor (May/19/2008)
Leonard and Penny each seek a reluctant adviser, Sheldon, for a bit of wisdom concerning their date with each other.
Guest Stars: James Hong as Chen
Director: Mark Cendrowski
Story: Chuck Lorre, Bill Prady | Teleplay: Steven Molaro, Lee Aronsohn
 

Season 2
18 :02x01 - The Bad Fish Paradigm (Sep/22/2008)
Penny and Leonard go on a date, but when their night out goes awry, Penny finds a friend in Sheldon.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski
Story: Bill Prady | Teleplay: David Goetsch, Steven Molaro
 
19 :02x02 - The Codpiece Topology (Sep/29/2008)
Leonard begins dating Sheldon's nemesis, Leslie Winkle, after seeing Penny with a handsome new guy.
Guest Stars: Travis Schuldt as Eric
Director: Mark Cendrowski
Story: Chuck Lorre, Lee Aronsohn | Teleplay: Bill Prady
 
20 :02x03 - The Barbarian Sublimation (Oct/06/2008)
Penny is introduced to online gaming by Sheldon, and she quickly becomes addicted.
Guest Stars: Mark Harelik as Dr. Eric Gablehauser, Tyler J. Olson as Blaine, Mark Hames as Tom
Director: Mark Cendrowski
Story: Nicole Lorre | Teleplay: Steven Molaro, Eric Kaplan
 
21 :02x04 - The Griffin Equivalency (Oct/13/2008)
Raj gets a swelled head and goes after Leonard's new crush, Penny, after being made famous in a magazine article leading to a disastrous result.
Guest Stars: Mark Harelik as Dr. Eric Gablehauser, | Uncredited: Charlie Sheen as Himself
Director: Mark Cendrowski
Story: Chuck Lorre, Bill Prady | Teleplay: Tim Doyle (1), Stephen Engel
 
22 :02x05 - The Euclid Alternative (Oct/20/2008)
Leonard and his friends want to help Sheldon overcome his fear of driving with an intervention.
Guest Stars: Octavia Spencer as Octavia, Elena Campbell-Martinez as Maria, Livia Trevino as Lourdes
Director: Mark Cendrowski
Story: Bill Prady, Steven Molaro | Teleplay: David Goetsch, Lee Aronsohn
 
23 :02x06 - The Cooper-Nowitzki Theorem (Nov/03/2008)
Sheldon, as well as the others, are baffled when a young grad student begins to fall for him.
Guest Stars: Emily Happe as Kathy, Riki Lindhome as Ramona
Director: Mark Cendrowski
Story: Daley Haggar, Stephen Engel | Teleplay: Tim Doyle (1), Richard Rosenstock
 
24 :02x07 - The Panty Piñata Polarization (Nov/10/2008)
After Sheldon bans Penny from the apartment for what she feels are minor infractions, she declares and all-out war on him.
Guest Stars: Analeigh Tipton as Analeigh
Director: Mark Cendrowski
Story: Tim Doyle (1), Bill Prady | Teleplay: Jennifer Glickman, Steven Molaro
 
25 :02x08 - The Lizard-Spock Expansion (Nov/17/2008)
Has a smitten Wolowitz found the love of his life, he thinks so until she meets Leonard.
Guest Stars: Sara Rue as Stephanie, Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski
Writer: Jennifer Glickman, David Goetsch
Story: Bill Prady
 
26 :02x09 - The White Asparagus Triangulation (Nov/24/2008)
Sheldon puts all his efforts to make Leonard's relationship with Stephanie, work.
Guest Stars: Sara Rue as Stephanie
Director: Mark Cendrowski
Story: Steven Molaro | Teleplay: Stephen Engel, Richard Rosenstock
 
27 :02x10 - The Vartabedian Conundrum (Dec/08/2008)
Leonard ask for advice from Penny when his relationship with Stephanie begins moving too fast for him.
Guest Stars: Sara Rue as Stephanie
Director: Mark Cendrowski
Story: Steven Molaro, Chuck Lorre | Teleplay: Bill Prady, Richard Rosenstock
 
28 :02x11 - The Bath Item Gift Hypothesis (Dec/15/2008)
Leonard finds no comfort and joy at Christmas time, as his colleague begins dating Penny. Meanwhile, Sheldon's adherence to gift-giving etiquette is driving everyone nuts.
Guest Stars: Michael Trucco as David Underhill, Michael Hyatt (1) as Charlotte
Director: Mark Cendrowski
Story: Bill Prady, Richard Rosenstock | Teleplay: Stephen Engel, Eric Kaplan
 
29 :02x12 - The Killer Robot Instability (Jan/12/2009)
Wolowitz leaves his friends in a bind when he drops out of an upcoming robot competition after becoming depressed when due to Penny's comment on his love life.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz, John Ross Bowie as Barry Kripke
Director: Mark Cendrowski
Story: Richard Rosenstock, Bill Prady | Teleplay: Steven Molaro, Daley Haggar
 
30 :02x13 - The Friendship Algorithm (Jan/19/2009)
The boys discover a conundrum which is baffling: The very source of Sheldon's social awkwardness seems to be his intelligence, is also the reason according to his new scientific procedure for making friends.
Guest Stars: Jade Zdanow as Rebecca, Will Deutsch as Jeremy, Jane Galloway Heitz (1) as Mildred, John Ross Bowie as Barry Kripke
Director: Mark Cendrowski
Story: Bill Prady, Richard Rosenstock | Teleplay: Chuck Lorre, Steven Molaro
 
31 :02x14 - The Financial Permeability (Feb/02/2009)
Penny receives help from Sheldon over her financial crisis, but causes Penny's burly ex-boyfriend, Kurt, to be confronted by Leonard.
Guest Stars: Brian Patrick Wade (1) as Kurt
Director: Mark Cendrowski
Story: Steven Molaro, Chuck Lorre | Teleplay: Richard Rosenstock, Eric Kaplan
 
32 :02x15 - The Maternal Capacitance (Feb/09/2009)
Penny and Leonard turn to each other and tequila for comfort after suffering a dreadful visit from his mother.
Guest Stars: Christine Baranski as Beverly
Director: Mark Cendrowski
Story: Bill Prady, Chuck Lorre | Teleplay: Steven Molaro, Richard Rosenstock
 
33 :02x16 - The Cushion Saturation (Mar/02/2009)
A paintball game sparks a fight between Penny and Sheldon, and leads to romance for Wolowitz and Leslie.
Guest Stars: Sara Gilbert as Leslie Winkle
Director: Mark Cendrowski
Story: Chuck Lorre | Teleplay: Bill Prady, Lee Aronsohn
 
34 :02x17 - The Terminator Decoupling (Mar/09/2009)
Leonard, Sheldon, Wolowitz and Raj take a train trip to San Francisco and can hardly believe beautiful sci-fi actress Summer Glau is onboard.
Guest Stars: Summer Glau as Herself, Dr. George Smoot as Himself
Director: Mark Cendrowski
Story: David Goetsch, Bill Prady | Teleplay: Tim Doyle (1), Stephen Engel
 
35 :02x18 - The Work Song Nanocluster (Mar/16/2009)
When Penny's friends, especially Sheldon, get involved in her new hair product business, it quickly suffers.
Director: Mark Cendrowski
Story: Lee Aronsohn, Bill Prady | Teleplay: David Goetsch, Richard Rosenstock
 
36 :02x19 - The Dead Hooker Juxtaposition (Mar/30/2009)
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
Guest Stars: Valerie Azlynn as Alicia, Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski
Writer: Steven Molaro
 
37 :02x20 - The Hofstadter Isotope (Apr/13/2009)
While at a comic book store, Penny is romanced by a friend of the guys'. Meanwhile, Leonard and Wolowitz head to a bar for ladies night in hope of finding women.
Guest Stars: Kevin Sussman as Stuart
Director: Mark Cendrowski
Writer: David Goetsch
 
38 :02x21 - The Vegas Renormalization (Apr/27/2009)
Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
Guest Stars: Jodi Lyn O'Keefe as Mikayla
Director: Mark Cendrowski
Story: Nicole Lorre, Andrea Roth | Teleplay: Steven Molaro
 
39 :02x22 - The Classified Materials Turbulence (May/04/2009)
Penny makes an unexpected discovery concerning Leonard, while on a date with Stuart. Meanwhile, a design flaw in his NASA project finds Wolowitz needing some help from his friends.
Guest Stars: Kevin Sussman as Stuart
Director: Mark Cendrowski
Story: Lee Aronsohn, Chuck Lorre | Teleplay: Bill Prady, Steven Molaro
 
40 :02x23 - The Monopolar Expedition (May/11/2009)
Leonard and Penny come to terms with their feelings for each other, as Leonard prepares himself for a three-month long science trip.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz, Brian George (2) as Dr. Koothrappali, Alice Amter as Mrs. Koothrappali
Director: Mark Cendrowski
Writer: Richard Rosenstock, Eric Kaplan
 

Season 3
41 :03x01 - The Electric Can Opener Fluctuation (Sep/21/2009)

View Trailer
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.
Guest Stars: Laurie Metcalf as Mary, John Ross Bowie as Barry Kripke
Director: Mark Cendrowski
Writer: Steven Molaro
 
42 :03x02 - The Jiminy Conjecture (Sep/28/2009)

View Trailer
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.
Guest Stars: Lewis Black as Professor Crawley
Director: Mark Cendrowski
Writer: Jim Reynolds
 
43 :03x03 - The Gothowitz Deviation (Oct/05/2009)

View Trailer
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
Story: Richard Rosenstock, Lee Aronsohn | Teleplay: Bill Prady, Maria Ferrari (1)
Songs: Shania Twain -- Man! I Feel Like A Woman
 
44 :03x04 - The Pirate Solution (Oct/12/2009)

View Trailer
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: Oliver Muirhead as Professor Laughlin, Elizabeth Bogush as Dr. Catherine Millstone, | Co-Guest Stars: Elena Campbell-Martinez as Cleaning Lady
Director: Mark Cendrowski
Writer: Steve Holland (1)
Songs: Survivor -- The Eye of the Tiger
 
45 :03x05 - The Creepy Candy Coating Corollary (Oct/19/2009)

View Trailer
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.
Guest Stars: Wil Wheaton as Himself, Kevin Sussman as Stuart, Melissa Rauch as Bernadette
Director: Mark Cendrowski
Story: Chuck Lorre, Bill Prady | Teleplay: Lee Aronsohn, Steven Molaro
 
46 :03x06 - The Cornhusker Vortex (Nov/02/2009)

View Trailer
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: Jason Mesches as Denny, Zachary Abel as Todd
Director: Mark Cendrowski
Story: Steven Molaro, Bill Prady | Teleplay: David Goetsch, Richard Rosenstock
 
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: Alice Amter as Mrs. Koothrappali, Brian George (2) as Dr. Koothrappali, Carol Ann Susi as Mrs. Wolowitz, Kevin Sussman as Stuart
Director: Mark Cendrowski
Story: Chuck Lorre, Lee Aronsohn | Teleplay: Jim Reynolds, Richard Rosenstock, Bill Prady
 
48 :03x08 - The Adhesive Duck Deficiency (Nov/16/2009)

View Trailer
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 Leonard her only rescue. Meanwhile, the guys in the desert are drunk and accidentally eat their way to being foodless.
Director: Mark Cendrowski
Story: Bill Prady, Chuck Lorre, David Goetsch | Teleplay: Steven Molaro, Eric Kaplan, Maria Ferrari (1)
 
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.
Guest Stars: John Ross Bowie as Kripke, Melissa Rauch as Bernadette, Carol Ann Susi as Mrs. Wolowitz, Katee Sackhoff as Herself, Ira Flatow as Himself
Director: Mark Cendrowski
Story: Chuck Lorre, Maria Ferrari (1) | Teleplay: Steve Holland (1), Jim Reynolds, Richard Rosenstock
 
50 :03x10 - The Gorilla Experiment (Dec/07/2009)
Penny gets help from Sheldon in order to understand what Leonard's work is, while Wolowitz develops a jealousy when Leonard starts hanging out with his new girlfriend.

Source: CBS
Guest Stars: Carol Ann Susi as Mrs. Wolowitz, Melissa Rauch as Bernadette
Director: Mark Cendrowski
Story: Richard Rosenstock, Chuck Lorre, Steve Holland (1) | Teleplay: Bill Prady, Steven Molaro, Maria Ferrari (1)
 
51 :03x11 - The Maternal Congruence (Dec/14/2009)
Sheldon is excited when Leonard's mother is once again visiting, however, Leonard himself is not so pleased.

Source: CBS
Guest Stars: Christine Baranski as Beverly
Director: Mark Cendrowski
Story: Lee Aronsohn, Steven Molaro, Maria Ferrari (1), Richard Rosenstock | Teleplay: Chuck Lorre, Bill Prady, David Goetsch
 
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