Big Bang Theory Episodes List

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Big Bang Theory Episodes List - Second Season 

Synopsis of Season Two Episodes With Featured Items Available Online

The Big Bang Theory: The Complete Second Season

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Get the Box set DVD as soon as it is available. Be able to watch, share, or study The Big Band Theory. Science and pop culture meet to form the geeks.

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The Bad Fish Paradigm 

Big Bang Theory - Season 2 Episode 1

Howard and Rajesh spy on Penny and Leonard with a webcam after they return from the restaurant. Penny had said that the fish was bad but they think she said that they should slow down a bit, They try to convince Leonard that the date did not go well.

Penny felt uncomfortable after the date about not finishing community college. She lied about her college career to Leonard and swears Sheldon to secrecy. This is hard for Leonard and results in Sheldon moving out. Howard brings Sheldon back home. Sheldon took Valium unknowingly and tells Leonard about Penny not finishing community college. Leonard tries to help by giving her some info on local community colleges. She is annoyed and slams the door in his face. The episode ends with Leonard saying "OK, this time I know where I went wrong". He discovers Wolowitz and Koothrapalli listening in on the entire incident with the webcam.

The Codpiece Topology 

Big Bang Theory - Season 2 Episode 2

When returning from a Renaissance fair, the guys see Penny with Eric, a new guy which makes Leonard jealous and he tries to get a relationship started with fellow physicist Leslie Winkle. Leonard is humiliated by all the guys for his failure with Penny.

Leslie agrees to date Leonard as she assumes the dominant role before telling him he should "assume the male role". Leonard convinces Sheldon to leave the apartment so his roommate and Leslie are alone. Sheldon tells Penny he feels uncomfortable that Leonard is dating his arch enemy Leslie.

Sheldon approves the relationship between Leonard and Leslie. He and Leslie discuss their differing views of physics. Leslie wants Leonard to back her up but he shares Sheldons ideas instead. Leslie asks them how they should raise the kids religiously speaking. She breaks up with Leonard and Sheldon tells Leonard to look on the bright said to which Leonard says "What's the bright side?". Sheldon says that it is just 9 months until Comic-Con.

Spock Costume 

As worn in The Codpiece Topology (Season 2, Episode 2)

Sheldon attends a a renaissance fair in a Spock costume. Hilarious.

Rubies Costume Co. Star Trek Classic Spock Wig With Ears

Amazon Price: $21.27 (as of 11/29/2009) Buy Now

Star Trek Movie Spock Blue Shirt Costume

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Star Trek the Original Series Tricorder

Amazon Price: $35.78 (as of 11/29/2009) Buy Now

The Barbarian Sublimation 

Big Bang Theory - Season 2 Episode 3

Sheldon is playing 'Age of Conan' and is distracted as Penny tries using her car keys to open her apartment door. He learns that Penny is frustrated by her failures, specifically about be rejected for parts in plays, for not having sex in months and not getting a raise at work. She swallows a fly on her way up the steps. Sheldon asks her to wait in his apartment for the locksmith. She asks about the game he is playing and is instantly hooked. The try to set her up with an online dating service that did not go well at all. After becoming addicted, she unknowingly accepts an online date wherein she is questing and drinking ale at a virtual tavern with Howard. She realizes fast what she has done and stops playing the game.

Age of Conan: Hyborian Adventures 

As referenced in the The Barbarian Sublimation (Season 2, Episode 3)

Age of Conan: Hyborian Adventures

Amazon Price: $7.55 (as of 11/29/2009)Buy Now

The Griffin Equivalency 

Big Bang Theory - Season 2 Episode 4

Raj is in People magazine's '30 Under 30 to Watch' list which makes his friends jealous. Wolowitz is jealous because he was not mentioned for his design that led to Raj's discovery and Sheldon cannot understand why Raj's work is being recognized at all. Leonard doesn't like the jealousy and they all try to support Raj but his antics leads to a strain between them. Leonard is still supportive, but loses his cool when Raj asks Penny to go to a People party with him as his date. After the party Penny and a drunk Raj return to his apartment and get a web call from his parents. They criticize Raj for dating a white girl even though Penny tells them she is not his girlfriend. Raj becomes sick from the drinking.

The next morning Raj is hungover and goes to Penny's door and she makes him apologize. This prompts Raj to say he is sorry. She forgives him and hugs him and Leonard sees the hug. Raj grins at Leonard. Sheldon comes out and forces a smile.

Greatest American Hero T-shirt 

Worn in the The Griffin Equivalency (Season 2, Episode 4)

The Euclid Alternative Production 

Big Bang Theory - Season 2 Episode 5

Leonard is burning the midnight oil on an experiment. The lasers he needs are only available on the midnight shift making him unable to drive Sheldon to the university. Sheldon needs a new way to get to work. Penny gives him a ride to work as it is her day off and Wolowitz gives the return ride on his scooter. Raj is forced to pick Sheldon up after they both throw him out of their vehicles. The friends have an intervention and demand Sheldon get a driver's license so he stops asking them for rides.

A trip to the Dept. of Motor Vehicles has Sheldon disrupting the test procedure by annoying the worker there, so the gang sets up a mock driving situation in the living room. The practice shows that the simulation was a good idea and why Sheldon never learned to drive-because he was a horrible driver. Later Sheldon gets a license but decides not to use it. He instead moves into his office for the duration of Leonard's night shifts. Leonard lives in peace in the apartment for an extra week due to not telling the actual end date of the night shifts.

The Cooper-Nowitzki Theorem 

Big Bang Theory - Season 2 Episode 6

After an open house night with grad students, Ramona Nowitzki, an obsessive grad student is attracted to Sheldon and works her way into his life as his girlfriend/assistant. Sheldon is oblivious as to what her intentions are, leaving the gang speechless. She ends up being a positive influence on his life until she cuts off his social life. She also assumes that Penny has a crush on Sheldon. Sheldon comes to the realization that he is in a 'relationship' with Ramona and asks Leonard to help him get rid of her. Things build until Sheldon solves his scientific problem that Ramona made him work on around the clock. Ramona suggest she share the credit with him, calling it the "Cooper-Nowitzki Theorem". Sheldon throws her out. Things get back to normal and then Sheldon is approached by another woman the same way Ramona approached him and the cycle begins again.

Halo, Paintball, and Battlestar Galatica 

As referenced in The Cooper-Nowitzki Theorem (Season 2, Episode 6)

Halo 3

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Battlestar Galactica: The Complete Series

Amazon Price: $173.49 (as of 11/29/2009) Buy Now

The Panty Pinata Polarization 

Big Bang Theory - Season 2 Episode 7

Penny's cable TV is cut off so she is coming to the guy's apartment to watch 'America's Next Top Model'. Sheldon bans her from the apartment for getting into his food, sitting in his spot, etc). Penny taunts him at the Cheesecake Factory. Sheldon goes overboard and hangs her laundry from a telephone wire outside the apartment. Penny gets revenge when Leonard gives her Sheldon's Kryptonite-his mom's phone number. Sheldon's mom calls him and makes him apologize to Penny.

Howard and Raj are trying to find the 'Next Top Model' house. They use a lot of technology and finally find it. They pose as cable guys and work their way into the house. The episode ends, leaving us to wonder what will happen next.

Superman T-shirt 

Worn in the The Panty Pinata Polarization (Season 2, Episode 7)

The Lizard-Spock Expansion 

Big Bang Theory - Season 2 Episode 8

Wolowitz thinks he has found his soul mate-Dr. Stephanie Barnett, until she meets Leonard. Wolowitz lets her drive the Mars rover and she goes into a ditch. Wolowitz destroys the security tapes and hard drives to hide what the evidence. Leonard does not know how to tell Howard that he is dating Stephanie. He decides to go to tell Howard himself. While he is there, Stephanie calls Howard and tells him that they are dating. Howard says to Leonard that he is dead to him. This only lasts until Stephanie invites Howard to go on a double date. Wolowitz hears on the TV news that the rover was found on Mars in a ditch, but that so much data was lost, that it will never be known who made this great find. The show ends with Wolowitz saying 'Son of a bitch!".

Robot Evolution T-Shirt 

Worn in the The Lizard-Spock Expansion (Season 2, Episode 8)

The White Asparagus Triangulation 

Big Bang Theory - Season 2 Episode 9

Sheldon is worried that Stephanie is the only woman Leonard has dated that he can tolerate. He tries to help Leonard with his relationship with Stephanie because he is destined to fail as 'history suggests'. Leonard tries to get away from Sheldon by taking Stephanie to the movies, but Sheldon follows them. Leonard turns to Penny for advice when he fears he is losing Stephanie. Penny is no help so he turns to Wolowitz and Koothrapalli but they are no help either. He runs to Penny again but she refuses to talk. Sheldon tries to prove that Leonard is physically superior to Stephanie by having him open a jar of white asparagus. Leonard breaks the jar by accidents and has to get stitches. Sheldon cannot understand why Leonard cannot keep a date.

After getting stitches Leonard finds his status on Facebook page has been changed to "In a relationship" and he discovers that Sheldon hacked into his Facebook account. Leonard tells Sheldon that he cannot speak until Stephanie changes her Facebook status to the same.

The Vartabedian Conundrum Production 

Big Bang Theory - Season 2 Episode 10

Stephanie moves in with Leonard and Sheldon but Leonard denies it because of their roommate contract. Sheldon has ringing in his ears and Stephanie tries to help him, but cannot. Sheldon tells Leonard of the changes that have to happen now that she has moved in. Penny shows up and neither Leonard or Sheldon have told Stephanie about Penny. The morning does not go well after that. Penny proves to Leonard that Stephanie is living with him. Stephanie purchases new clothes for Leonard that he hates and ruins. Leonard sees that the relationship with Stephanie is moving too fast for him and he turns to Penny for advice. Each time he tries to follow Penny's advice by telling Stephanie how he feels, they end up in bed together.

Sheldon, in the meantime, sneaks into the hospital to test himself many times as his ears are still ringing. When Leonard gets back, Stephanie diagnoses Sheldon and says he has an inflamed larynx. Sheldon asks Penny via the computer for herbal tea and honey.

The Bath Item Gift Hypothesis 

Big Bang Theory - Season 2 Episode 11

Leonard meets award winning scientist David Underhill who is his intellectual superior and Underhill is all that Leonard is not: charming, handsome and cool. This does not sit well with Leonard but Leonard helps Underhill with research when he asks. Leonard loves working with Underhill but is jealous when Underhill becomes interested in Penny and she returns the interest.

Penny brings Sheldon a Christmas gift, which throws Sheldon because he views the holidays as a pagan ritual based upon obligations. He now feels that he has to buy her a gift and asks Wolowitz and Koothrappali to help him and they agree. Sheldon thinks he has a logical gift-giving scenario cooked until he opens his gift from Penny-a napkin that was autographed by Leonard Nimoy.

Leonard Nimoy Autograph 

As referenced in The Bath Item Gift Hypothesis (Season 2, Episode 11)

The Killer Robot Instability 

Big Bang Theory - Season 2 Episode 12

Wolowitz goes into a deep depression when Penny comments about his love life and he drops out of an upcoming fighting robot competition he has entered with his friends. Sheldon accepts the challenge for a one-on-one fight between their robot and one of their co-worker's robots. Leonard tries to get Howard back on the team and sends Penny to apologize to him. Penny goes to apologize and ends up hearing his whole dating history. She tells Howard not to try so hard with girls. Howard tries to kiss her and Penny punches him in the face. Meanwhile the friend's robot loses to their co-worker's robot and it is destroyed beyond repair and cannot enter the competition. Sheldon hosts a vigil for their lost robot and Penny says the robot was only a toy, and a deflated Sheldon goes to his room.

The Friendship Algorithm 

Big Bang Theory - Season 2 Episode 13

Due to his social awkwardness, Sheldon comes up with a scientific procedure for making friends. He needs to use a special computer that is in Barry Kripke's office, but Leonard tells him that only Barry's friends can use it. Kripke blows him off so Sheldon finds a children's book in the bookstore about how to make friends. He makes a flowchart for the task. He goes rock climbing with Kripke and faints halfway up when he sees the ground below. Sheldon invites Kripke to the apartment to everyone's dismay. Raj is told he is being replaced by Kripke because five friends is too many to handle. Barry tells Sheldon there is a sign up sheet for the computer of which he has no control. Sheldon then stops being friends with Barry and goes back to his four pals, Leonard, Howard, Raj and Penny.

Galaxy T-Shirt 

Worn in the The Friendship Algorithm (Season 2, Episode 13)

The Financial Permeability 

Big Bang Theory - Season 2 Episode 14

Sheldon comes up with a 'simple' solution to Penny's financial problems and this leads to a confrontation between Leonard and Kurt, Penny's ex boyfriend. Sheldon loans Penny money to pay her rent and she starts to worry that she won't be able to pay him back quickly enough. Sheldon has no doubt that she will re-pay and is not worried. Leonard learns that Kurt owes Penny $1800 when trying to help her solve her problems. Leonard goes to Kurt without Penny knowing to try to collect the money and Kurt writes "I owe Penny $1800" on Leonard's forehead. Penny pays Sheldon back with money that Kurt gives her but Leonard was disappointed as Kurt never told her about his visit.

The Maternal Capacitance 

Big Bang Theory - Season 2 Episode 15

Childhood problems come to the surface for Penny and Leonard after a phone call from Leonard's mother, Dr. Beverly Hofstadter. While doing laundry, Penny runs into Leonard's mom and she tells Penny she is a psychiatrist and a neuroscientist. Penny inquires about Leonard's childhood and she tells her embarrassing points about her perception of Leonard's development. By the time they get to Leonard's apartment, Penny is crying after being psychoanalyzed. Sheldon likes Dr. Hofstadter and the two end up discussing intimate relationship points which leads to a game of Rock Band.

Howard is in the cafeteria working and asks Leonard's mom about her two other very successful kids. Leonard gets revenge by telling her that Howard lives with his mom and about Raj's selective mutism. She tells them that they are in a ersatz homosexual relationship. Leonard and Penny discuss Leonard's mom over white white and tequila. As they drink, he tells Penny he invented a hugging machine when he was ten so he could get physical attention. Penny sneaks a kiss and they go to bed together. Leonard tells her that his mom would say that he is psychologically having sex with his mom and she with her dad. Penny throws him out.

Rock Band 2 

Rock Band seen in The Maternal Capacitance (Season 2, Episode 15)

Wii Rock Band 2 Special Edition

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The Cushion Saturation 

Big Bang Theory - Season 2 Episode 16

Penny and Sheldon fight as a result of a paintball game and Wolowitz and Leslie find romance after the game. Penny accidentally shoots a paintball capsule at Sheldon's 'spot' on the couch and she and Leonard struggle to clean it. They try turning over the cushion but Sheldon notices and finds the stain. Penny gets the cushion dry cleaned but it takes a week which puts Sheldon through withdrawal. After refusing to sit on the newly cleaned cushion, Leonard tells Sheldon that his favorite Szechuan Palace closed two years ago. Sheldon gets his revenge by shooting Penny right away at their next paintball game. The game leads to arguments.

Howard and Leslie start sleeping together at Howard's place. Leslie tries controlling Howard by funding his work project. She asks him to come to her sisters wedding and he says no. She threatens to take away a trip to the CERN project in Geneva. Howard now takess his "new" role.

Retro Japanese Robot T-Shirt 

Worn in the The Cushion Saturation (Season 2, Episode 16)

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The Terminator Decoupling Production 

Big Bang Theory - Season 2 Episode 17

While on a train trip to San Francisco, the trip takes a detour when Leonard, Sheldon, Wolowitz and Raj find out that their favorite sci-fi actress, Summer Glau is on the train. They argue when they realize one will have to approach her. Wolowitz is chosen and he tries to think up a clever opening line and meanwhile Raj is talking with her after what he later discovered was non-alcoholic beer. He now stops talking. Wolowitz takes over but Summer is creeped out by him. Summer gets off the train before Leonard got his chance with her.

Sheldon needs Penny to find his flash drive so he can email a paper to Professor George Smoot in San Fransisco. Sheldon is hostile to Leonard's idea that Penny should get the flash drive and reminds Leonard that no one can go into his room. Sheldon insists and gives Penny tips on how to enter the room. She is led to a Japanese puzzle box with the flash drive inside. She puts the box on the floor and smashes it open.

Terminator - The Sarah Connor Chronicles 

As referenced in the Terminator Decoupling Production (Season 2, Episode 17)

Summer Glau takes a guest starring role in this episode, be sure and catch her in both seasons of the Terminator: The Sarah Connor Chronicles.

The Work Song Nanocluster 

Big Bang Theory - Season 2 Episode 18

The home hair accessory business turns into a nightmare for Penny when Sheldon takes over and is jacked up on caffeine. He offers tips to her on how she can make more money and Leonard, Howard and Raj add their ideas on how to mass produce and sell the barrettes called Pennyblossoms. Leonard makes a website to sell the products and adds a one day rush shipping option. They get an order for 1,000 Pennyblossoms and they all five work all night to finish only to find the same customer has ordered another 1,000. This leads them all to quit because they are tired. Sheldon is still hyper from the coffee and refuses to quit and he runs off in his Flash costume to get more coffee.

The Dead Hooker Juxtaposition 

Big Bang Theory - Season 2 Episode 19

Penny starts a rivalry with a new sexy woman neighbor, Alicia who lives above the guys and who threatens to replace Penny. Leonard, Wolowitz and Raj are helping her set up her apartment. They drive her to Universal studio for her audition in CSI and she wants to repay them with Chinese food, even tough Penny has already bought then food in an attempt to get them back. Alicia asks Penny in the laundry room how much money physicist make and Penny accuses her of taking advantage of the guys. The fight in the lobby and Penny gets a black eye. Alicia is with the director of CSI at the end of the episode.

Superman White T-Shirt 

Worn in the The Dead Hooker Juxtaposition (Season 2, Episode 19)

Superman - Classic Logo White T-Shirt

Amazon Price: (as of 11/29/2009)Buy Now

The Hofstadter Isotope 

Big Bang Theory - Season 2 Episode 20

Fellow comic book lover, Stuart, flirts with Penny. Leonard and Wolowitz go out to a 'Ladies Night' at a local bar. Penny goes to the comic book store with the guys to get a comic book for her nephew's birthday. Stuart works there and is also an artist. Leonard doesn't like seeing Penny with Stuart as the feels him and Stuart are alike. He asks Wolowitz to take him to the bar. Raj is the only one who is successful in getting a girl. Sheldon and Stuart debate the identity of Batman and Sheldon wins the argument when Stuart says he is tired and wants to leave.

Batman: R.I.P. 

As referenced in The Hofstadter Isotope (Season 2, Episode 20)

Batman: R.I.P.

Amazon Price: $16.49 (as of 11/29/2009)Buy Now

The Vegas Renormalization Production 

Big Bang Theory - Season 2 Episode 21

Leslie breaks up with Howard and he becomes depressed. Leonard and Raj decide to take him to Vegas to cheer him up. While there, a prostitute names Mikaela starts talking to Raj. They hire her to pose as a Jewish woman to seduce Howard. When Howard realizes what is happening, he thanks the two for setting him up.

Sheldon is ready to spend the weekend at home alone. When he gets home he finds his keys are locked inside. He is forced to spend the night with Penny has the building manager is not available and Penny left her emergency key in their apartment. He sleeps with her because he does not fit on the couch. When Leonard returns he sees Sheldon coming out of Penny's apartment. Sheldon says he had dinner with her and spent the night and says he knows what it means by the term 'friends with benefits'. Leonard looks shocked.

The Classified Materials Turbulence 

Big Bang Theory - Season 2 Episode 22

Howard is celebrating his 'space toilet' at the comic book store by buying all of his friends new comics. Stuart tells Leonard that he has a second date with Penny and asks for advice. Leonard ignores his request for help as he doesn't like him seeing Stuart. Leonard later tells him to take it slow with Penny with hopes that she will dump him. Leonard feels guilty about this advice he gave and goes to apologize the next day. Stuart says his advice was perfect in the beginning because she was drunk and they starting making out, but that she blurted out Leonard's name. Leonard celebrated out of Stuart's sight.

Howard finds out he made a 'small' error on the space toilet that will cause it to dispel the waste through the ISS after ten flushes instead of into space. He asks Raj and Sheldon to help him fix it and they do. The episodes ends with the International Space Station astronauts asking to do a spacewalk because their waste had leaked out of the toilet.

The Monopolar Expedition 

Big Bang Theory - Season 2 Episode 23

Sheldon can pay for a three month expedition to the North Magnetic Pole thanks to winning a National Science Foundation grant. He wants his three friends to join him. To prepare for the trip, the three spend time in the freezer at the Cheesecake Factory. When Penny learns that Leonard is leaving she seems upset. She gives him a blanket with sleeves and gives him a hug. On the morning of the trip, Leonard asks Penny about the meaning of the long hug and the blanket and she says just that she will miss him and hopes he has a safe trip. However, when she closes the store she says to herself that she meant that she wishes he was not going. The group leaves for the Arctic.

Snuggie Blanket With Sleeves 

As seen in The Monopolar Expedition (Season 2, Episode 23)

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