The Big Bang Theory


Leonard Hofstadter and Sheldon Cooper are both outstanding physicists working at Cal Tech in Pasadena, California. They are colleagues, fantastic friends, and roommates, even though in all capacities their relationship is constantly examined specifically through Sheldon's regimented, deeply eccentric, and non-conventional ways. They are also pals with their Cal Tech colleagues mechanical engineer Howard Wolowitz and astrophysicist Rajesh Koothrappali. The foursome spend their time working on their man or woman work projects, taking part in video games, watching science-fiction movies, or reading comic books. As they are self-professed nerds, all have little or no good fortune with women. When Penny, a pretty girl and an aspiring actress from Omaha, moves into the rental across the hall from Leonard and Sheldon's, Leonard has another aspiration in life, namely to get Penny to be his girlfriend.
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S12E9 -The Citation Negat..

Sheldon and Amy are devastated after learning from a Russian paper t..

S12E8 -The Consummation D..

Sheldon tries to bond with Amy’s father, but when Wolowitz lures M..

S12E7 -The Grant Allocati..

Leonard is caught between a rock and a hard place when he’s respon..

S12E6 -The Imitation Pert..

When Wolowitz dresses up as Sheldon for Halloween, Sheldon seeks ret..

S12E5 -The Planetarium Co..

When Amy doesn’t have time to work on super-asymmetry, Sheldon goe..

S12E4 -The Tam Turbulence

When Sheldon won’t tell anyone why he’s never mentioned Tam, his..

S12E3 -The Procreation Ca..

The Wolowitzes’ life gets complicated when Stuart starts bringing ..

S12E2 -The Wedding Gift W..

Sheldon and Amy drive themselves crazy trying to figure out what “..

S12E1 -The Conjugal Confi..

Sheldon and Amy’s honeymoon runs aground in New York, while Penny ..

S11E24 -The Bow Tie Asymm..

When Amy’s parents and Sheldon’s family arrive for the wedding, ..

S11E23 - The Sibling Real..

When Sheldon learns that his mother won’t attend his wedding unles..

S11E22 -The Monetary Insu..

Sheldon goes to Vegas to win money for science. Also, Penny and Bern..

S11E21 - The Comet Polari..

Sheldon’s comic book store experiences changes when writer Neil Ga..

S11E20 - The Reclusive Po..

Sheldon takes the guys to a cabin in the middle of nowhere to meet a..

S11E19 -The Tenant Disass..

When Leonard learns Sheldon is the president of the tenants associat..

S11E18 -The Gates Excitat..

Penny gets the opportunity to host Bill Gates at work when his compa..

S11E17 -The Athenaeum All..

Leonard jumps through hoops to help secure the perfect wedding venue..

S11E16 -The Neonatal Nome..

When Bernadette won't go into labor, the gang tries different tactic..

S11E15 -The Novelization ..

Leonard's book raises questions, and Amy guest stars on the new Prof..

S11E14 -The Separation Tr..

Koothrappali finds himself in the middle of domestic drama when he l..

S11E13 - The Solo Oscilla..

When Sheldon kicks Amy out to work solo, she and Leonard bond during..

S11E12 -The Matrimonial M..

To discover who would be most qualified to be best man and maid of h..

S11E11 -The Celebration R..

Sheldon and Wolowitz plan birthday celebrations for Amy and Halley, ..

S11E10 -The Confidence Er..

Sheldon and Amy try to eliminate stress from wedding planning by app..

S11E9 -The Bitcoin Entang..

Sheldon tries to teach the guys a lesson after they cut him out of a..

S11E8 -The Tesla Recoil

Leonard and Wolowitz are furious after they learn Sheldon went to wo..

S11E7 - The Geology Metho..

Sheldon and Bert collaborate on a research project, despite Sheldon..

S11E6 - The Proton Regene..

Sheldon goes head-to-head with Wil Wheaton for the role of the new P..

S11E5 - The Collaboration..

Sheldon and Koothrappali confide in Bernadette when they can't handl..

S11E4 - The Explosion Imp..

Wolowitz and Sheldon bond when they drive to the desert to shoot off..

S11E3 - The Relaxation In..

As Sheldon stresses about picking a wedding date, Amy tries to convi..

S11E2 - The Retraction Re..

Leonard angers the university – and the entire physics community ..

S11E1 - The Proposal Prop..

In the eleventh season opener, Amy gives Sheldon an answer to his pr..

S10E24 - The Long Distanc..

The gang is concerned when Sheldon’s former admirer, Dr. Ramona No..

S10E23 - The Gyroscopic C..

Amy is offered a Fellowship at Princeton, Raj makes new living arran..

S10E22 - The Cognition Re..

Leonard isn’t thrilled when Penny considers taking a new job offer..

S10E21 - The Separation A..

Howard and Bernadette have a hard time leaving Halley in day care wh..

S10E20 - The Recollection..

Sheldon pushes himself to the limit when he collaborates on projects..

S10E19 - The Collaboratio..

Leonard, Penny and Raj adjust to their new living arrangement and Sh..

S10E18 - The Escape Hatch..

Raj searches for a cheaper living arrangement.

S10E17 - The Comic-Con Co..

The guys' annual trip to Comic Con is in doubt when Raj can't afford..

S10E16 - The Allowance Ev..

Sheldon and Amy have their first fight since moving in together and ..

S10E15 - The Locomotion R..

Leonard and Wolowitz try to distract Sheldon when he slows the progr..

S10E14 - The Emotion Dete..

Sheldon uses a machine to help him identify other people's emotions,..

S10E13 - The Romance Reca..

Leonard and Penny may need a Relationship Agreement, and Sheldon vol..

S10E12 - The Holiday Summ..

Sheldon and Amy visit Leonard and Penny for the first time since the..

S10E11 - The Birthday Syn..

Amy's desire to have an intimate night with Sheldon on her birthday ..

S10E10 - The Property Div..

Sheldon and Leonard must divide up their possessions and remove Penn..

S10E9 - The Geology Eleva..

When Bert, a Caltech geologist, wins the MacArthur Genius fellowship..

S10E8 - The Brain Bowl In..

After a successful experiment combining their genes, Sheldon will st..

S10E7 - The Veracity Elas..

In order to continue living with Sheldon, Amy lies to him about repa..

S10E6 - The Fetal Kick C..

Penny learns there are fans of her performance in ``Serial Ape-ist''..

S10E5 - The Hot Tub Conta..

Leonard and Penny must separate a quarreling Sheldon and Amy when th..

S10E4 - The Cohabitation ..

When Amy's apartment floods, she proposes a cohabitation experiment ..

S10E3 - The Dependence Tr..

Sheldon can't keep up with the late nights Howard and Leonard are pu..

S10E2 - The Military Mini..

The Air Force shows interest in the guidance system and Penny lets i..

S10E1 - The Conjugal Conj..

After Sheldon’s mother and Leonard's father share an evening toget..

S9E24 - The Convergence C..

Leonard and Penny get remarried in front of their friends (who show ..

S9E23 - The Line Substitu..

Sheldon hires Stuart to spend the day with Amy when he’d rather go..

S9E22 - The Fermentation ..

The gang goes to a wine bar and runs into Penny’s old boyfriend, Z..

S9E21 - The Viewing Party..

Everyone must choose sides when a small argument between Leonard and..

S9E20 - The Big Bear Prec..

Secrets are revealed when Amy and Sheldon join Penny and Leonard on ..

S9E19 - The Solder Excurs..

Amy is shocked at a revelation from Sheldon after she buys him a new..

S9E18 - The Application D..

Leonard, Sheldon and Wolowitz file for a patent on their new inventi..

S9E17 - The Celebration E..

For the first time in nine years, the gang celebrates Sheldon's birt..

S9E16 - The Positive Neg..

The gang celebrates news of Bernadette's pregnancy by singing karaok..

S9E15 - The Valentino Sub..

Amy and Sheldon host a Valentine's Day edition of Fun With Flags; Pe..

S9E14 - The Meemaw Materi..

Sheldon's excitement about his Meemaw's visit fades when she butts h..

S9E13 - The Empathy Optim..

After dealing with Sheldon while he was sick, Leonard, Penny and the..

S9E12 - The Sales Call Su..

Leonard visits a psychiatrist so Penny can make a sales call. Stuart..

S9E11 - The Opening Night..

After dating for more than five years, Amy and Sheldon spend the nig..

S9E10 - The Earworm Rever..

Sheldon has a song stuck in his head; despite their awkward date, Am..

S9E9 - The Platonic Permu..

Amy and Sheldon spend Thanksgiving at the aquarium -- as friends; Wo..

S9E8 - The Mystery Date O..

When Leonard, Penny and Bernadette learn that Amy is going out on a ..

S9E7 - The Spock Resonance

While being interviewed for a documentary about Spock from "Star Tre..

S9E6 - The Helium Insuff..

Leonard and Sheldon go to great lengths to secure the helium they ne..

S9E5 - The Perspiration I..

Barry Kripke expresses interest in Amy while leading a fencing lesso..

S9E4 - The 2003 Approxima..

Sheldon reverts back to 2003 when he learns that Leonard and Penny a..

S9E3 - The Bachelor Party..

A flat tire during Leonard's bachelor party weekend in Mexico tests ..

S9E2 - The Separation Osc..

Leonard confronts the woman he kissed on the North Sea in an attempt..

S9E1 - The Matrimony Mome..

Sheldon is confronted by a mystery of the universe he cannot unravel..

S9E00 - The Commitment De..

While facing relationship changes, Sheldon pushes Penny and Leonard ..

S8E24 - The Commitment De..

While facing relationship changes, Sheldon pushes Penny and Leonard ..

S8E23 - The Maternal Comb..

When Sheldon's and Leonard's mothers finally meet, personalities col..

S8E22 - The Graduation Tr..

Wolowitz questions his engineering skills; a canceled flight puts Le..

S8E21 - The Communication..

The guys fight over a message that could be used for alien contact.

S8E20 - The Fortification..

Howard discovers a family secret. Sheldon and Amy build a fort. Penn..

S8E19 - The Skywalker Inc..

A speaking engagement at UC Berkeley puts Leonard and Sheldon in a g..

S8E18 - The Leftover Ther..

When the loss of electricity in the Wolowitz house leads to the defr..

S8E17 - The Colonization ..

Amy and Sheldon buy a pet turtle together. Sheldon plans on becoming..

S8E16 - The Intimacy Acce..

Penny agrees to be part of Sheldon's intimacy experiment. Meanwhile,..

S8E15 - The Comic Book St..

Sheldon becomes annoyed after discovering that Amy has been helping ..

S8E14 - The Troll Manifes..

Sheldon and Leonard must defend themselves from an online bully's cr..

S8E13 - The Anxiety Optim..

The gang tries to help Sheldon when he becomes stuck in a rut at wor..

S8E12 - The Space Probe D..

Raj is concerned over whether a probe he designed will work in outer..

S8E11 - The Clean Room In..

Christmas Eve, Amy plans a traditional Victorian dinner, while Raj, ..

S8E10 - The Champagne Ref..

Howard, Leonard and Raj look through their dead professor's research.

S8E9 - The Septum Deviation

Leonard has minor surgery on his nose, causing Sheldon to overreact.

S8E8 - The Prom Equivalency

Sheldon feels pressured to participate in traditions when the gang r..

S8E7 - The Misinterpretat..

The guys try to help when Penny is faced with an awkward dilemma at ..

S8E6 - The Expedition App..

Raj and Sheldon try to simulate a dark-matter research expedition; P..

S8E5 - The Focus Attenuat..

During their weekend in Las Vegas, Bernadette and Amy accuse Penny o..

S8E4 - The Hook-Up Reverb..

Raj's honesty comes back to haunt him when his new girlfriend is unf..

S8E3 - The First Pitch In..

Wolowitz feels nervous when he is asked to throw the first pitch at ..

S8E2 - The Junior Profess..

Amy takes advantage of the tension between Penny and Bernadette.

S8E1 - The Locomotion Int..

Leonard and Amy take an unexpected road trip to Arizona to pick up S..

S7E24 - The Status Quo Co..

In the Season 7 finale, Sheldon gets caught up in all the life-alter..

S7E23 - The Gorilla Disso..

A bad day compels Penny to re-evaluate her choices -- including Leon..

S7E22 - The Proton Transm..

A grief-stricken Sheldon receives counseling from his childhood TV i..

S7E21 - The Anything Can ..

Sheldon gives spontaneity a try; Raj asks Howard for help with prepa..

S7E20 - The Relationship ..

Raj and Emily double-date with the Wolowitzes, and Howard becomes fl..

S7E19 - The Indecision Am..

Raj struggles with guilt when he dates two women at once; Penny has ..

S7E18 - The Mommy Observa..

Sheldon is faced with a new reality when he visits his mom in Housto..

S7E17 - The Friendship Tu..

Things turn rocky between Sheldon and Wolowitz after a barrage of in..

S7E16 - The Table Polariz..

Penny ponders the potential purchase of a dining-room table for Leon..

S7E15 - The Locomotive Ma..

Sheldon and Amy go on a trip to wine country with Howard and Bernade..

S7E14 - The Convention Co..

Unable to score tickets for Comic-Con, Sheldon decides to stage his ..

S7E13 - The Occupation Re..

There's impactful news on the work front as Penny makes a big step t..

S7E12 - The Hesitation Ra..

As Leonard tries to help Penny with a disappointment, Penny asks him..

S7E11 - The Cooper Extrac..

While Sheldon is in Texas, the rest of the gang realize how much he ..

S7E10 - The Discovery Dis..

Amy and Leonard try to help Sheldon deal with his shame; Raj stays w..

S7E9 - The Thanksgiving D..

Howard's mother has a say when he and Bernadette host Thanksgiving d..

S7E8 - The Itchy Brain Si..

Leonard fails to stop Sheldon from overreacting after a past slight ..

S7E7 - The Proton Displac..

When Sheldon's childhood hero, Professor Proton, seeks Leonard's hel..

S7E6 - The Romance Resona..

Sheldon makes a major scientific breakthrough, but he feels it may h..

S7E5 - The Workplace Prox..

Sheldon and Amy's relationship is tested when she takes a job at his..

S7E4 - The Raiders Minimi..

Sheldon wants revenge after Amy ruins one of his favorite films; Leo..

S7E3 - The Scavenger Vortex

Raj designs a scavenger hunt that brings out the best -- and the wor..

S7E2 - The Deception Veri..

Leonard and Sheldon's friendship is tested; Wolowitz's relationship ..

S7E1 - The Hofstadter Ins..

Sheldon and Penny share secrets while Leonard is away; Wolowitz help..

S6E24 - The Bon Voyage Re..

When Leonard is offered an exciting opportunity to work overseas, Pe..

S6E23 - The Love Spell Po..

Amy and Sheldon's relationship takes a surprising turn during a game..

S6E22 - The Proton Resurg..

Leonard and Sheldon hire the host (Bob Newhart) of their favorite ch..

S6E21 - The Closure Alter..

Amy tries to help Sheldon get over his compulsive need for closure w..

S6E20 - The Tenure Turbul..

The guys' competition for a tenured professorship leads them to sham..

S6E19 - The Closet Reconf..

Howard considers whether or not he should open a letter from his fat..

S6E18 - The Contractual O..

Leonard, Sheldon and Wolowitz talk to junior high girls about scienc..

S6E17 - The Monster Isola..

Koothrappali is put out when his date walks out in the middle of the..

S6E16 - The Tangible Affe..

Leonard arranges a magical Valentine's Day dinner date for Penny, bu..

S6E15 - The Spoiler Alert..

Leonard and Sheldon get into a spat that sends Leonard across the ha..

S6E14 - The Cooper/Kripke..

Sheldon faces a crisis of confidence when he is forced to work with ..

S6E13 - The Bakersfield E..

While the guys take a road trip to a comic book convention dressed a..

S6E12 - The Egg Salad Equ..

When Sheldon is accused of sexual harassment, he ends up getting Raj..

S6E11 - The Santa Simulat..

During a game, Sheldon revisits Christmas memories; Amy, Penny and B..

S6E10 - The Fish Guts Dis..

Amy takes ill and Sheldon becomes her nursemaid, while Wolowitz take..

S6E9 - The Parking Spot E..

When the University reassigns Sheldon’s parking spot to Wolowitz, ..

S6E8 - The 43 Peculiarity

Aired: November 15, 2012

Raj and Howard try to figure ou..

S6E7 - The Habitation Con..

Wolowitz struggles with moving out of his mother’s house. Meanwhil..

S6E6 - The Extract Oblite..

A disagreement over a game of Words With Friends endangers Sheldon's..

S6E5 - The Holographic Ex..

The gang celebrates Halloween at Stuart?s comic book store. Meanwhil..

S6E4 - The Re-Entry Minim..

Wolowitz is disappointed when he doesn't receive a hero's welcome up..

S6E3 - The Higgs Boson Ob..

Amy feels threatened when Sheldon hires a young female assistant. Me..

S6E2 - The Decoupling Flu..

Sheldon uncovers a secret about Penny and Leonard; and in space, the..

S6E1 - The Date Night Var..

Season 6 blasts off with Wolowitz in space, and despite that, he sti..

S5E24 - The Countdown Ref..

The fifth season ends with Howard and Bernadette deciding to get mar..

S5E23 - The Launch Accele..

When NASA reschedules the launch of Howard's mission, the countdown ..

S5E22 - The Stag Converge..

Bernadette has second thoughts about marrying Wolowitz when details ..

S5E21 - The Hawking Excit..

Sheldon is in seventh heaven and prepared to do whatever it takes to..

S5E20 - The Transporter M..

Raj may have found his soul mate after his parents set him up on a d..

S5E19 - The Weekend Vortex

Sheldon opts to spend a weekend playing video games with the guys in..

S5E18 - The Werewolf Tran..

After his barber is hospitalized, Sheldon undergoes a hair-raising c..

S5E17 - The Rothman Disin..

Sheldon and Kripke square off in a series of sports-related competit..

S5E16 - The Vacation Solu..

Sheldon takes it easy by working with Amy at her neurobiology lab af..

S5E15 - The Friendship Co..

The friendship contract is in danger of being nullified when Leonard..

S5E14 - The Beta Test Ini..

Leonard and Penny give dating another try, while Raj begins a rather..

S5E13 - The Recombination..

Everything might change when Leonard offers Penny a spur of the mome..

S5E12 - The Shiny Trinket..

Amy is upset with Sheldon when he isn't impressed with her recent ac..

S5E11 - The Speckerman Re..

Leonard confronts his fears when he's contacted by a bully who torme..

S5E10 - The Flaming Spitt..

Sheldon becomes jealous when Stuart from the comic-book store asks A..

S5E9 - The Ornithophobia ..

Leonard and Penny attempt to hang out alone; and Sheldon tries to ov..

S5E8 - The Isolation Perm..

Amy is crushed when Bernadette and Penny go shopping for wedding dre..

S5E7 - The Good Guy Fluct..

Leonard feels threatened when a charming comic-book artist comes bet..

S5E6 - The Rhinitis Revel..

Sheldon's mom visits, and he competes for her attention, which seems..

S5E5 - The Russian Rocket..

Leonard and Sheldon attend a party at the home of Sheldon's nemesis,..

S5E4 - The Wiggly Finger ..

Raj meets a woman with whom he's able to talk.

S5E3 - The Pulled Groin E..

Leonard and Amy get to know each other better, while Howard and Bern..

S5E2 - The Infestation Hy..

Penny and Sheldon clash, and Amy is caught in the middle of their ba..

S5E1 - The Skank Reflex A..

In the fifth-season opener, Penny hits a low point when she realizes..

S4E24 - The Roommate Tran..

In the fourth-season finale, Raj moves in with Sheldon when Leonard ..

S4E23 - The Engagement Re..

Howard finally tells his mother that he's marrying Bernadette, and t..

S4E22 - The Wildebeest Im..

Raj makes an attempt to cure his phobia of talking to women; and Pen..

S4E21 - The Agreement Dis..

Priya uses her legal expertise to rip apart Sheldon's roommate agree..

S4E20 - The Herb Garden G..

Sheldon and Amy spread gossip as part of an experiment; and Howard a..

S4E19 - The Zarnecki Incu..

The guys become sleuths to find out who hacked Sheldon's online-game..

S4E18 - The Prestidigitat..

Leonard is forced to choose between Penny and his new girlfriend, Pr..

S4E17 - The Toast Derivat..

Sheldon is upset when he realizes Leonard is the center of their gro..

S4E16 - The Cohabitation ..

Wolowitz considers taking things with Bernadette to the next level; ..

S4E15 - The Benefactor Fa..

A wealthy donor makes Leonard question what he is willing to do for ..

S4E14 - The Thespian Cata..

Sheldon takes acting lessons from Penny in hope of becoming a better..

S4E13 - The Love Car Disp..

Bernadette runs into her ex-boyfriend (Rick Fox) while attending a s..

S4E12 - The Bus Pants Uti..

Leonard's idea for a smartphone app derails his friendship with Shel..

S4E11 - The Justice Leagu..

The guys enter a costume contest with Penny's new boyfriend.

S4E10 - The Alien Parasit..

Amy realizes she has feelings for Penny's ex; Koothrappali and Wolow..

S4E9 - The Boyfriend Comp..

Penny asks Leonard to lie to her father (Keith Carradine); Howard, R..

S4E8 - The 21-Second Exci..

While the guys camp out for a long-awaited movie screening, Penny an..

S4E7 - The Apology Insuff..

Howard baffles Sheldon when he won't accept his apology; and an FBI ..

S4E6 - The Irish Pub Form..

Leonard keeps an affair secret from Sheldon, Howard and Raj.

S4E5 - The Desperation Em..

Leonard realizes he's the only one without a girlfriend, while Sheld..

S4E4 - The Hot Troll Devi..

An embarrassing secret of Wolowitz's is revealed; Raj and Sheldon ge..

S4E3 - The Zazzy Substitu..

When Sheldon searches for an alternative to human companionship, the..

S4E2 - The Cruciferous Ve..

Realizing he will not live long enough to download his consciousness..

S4E1 - The Robotic Manipu..

Penny tags along on Sheldon's first date; Wolowitz finds a new use f..

S3E23 - The Lunar Excitat..

While Penny worries that dating Leonard has ruined her for normal gu..

S3E22 - The Staircase Imp..

Leonard tells Penny about how he met Sheldon for the first

S3E21 - The Plimpton Stim..

Leonard and Sheldon compete for the attention of a famous female phy..

S3E20 - The Spaghetti Cat..

When Leonard and Penny aren't speaking, Sheldon goes to extremes to ..

S3E19 - The Wheaton Recur..

A fight between Leonard and Penny threatens their relationship, whil..

S3E18 - The Pants Alterna..

Sheldon's friends come to his aid when his fear of public speaking s..

S3E17 - The Precious Frag..

When the guys find a ring from "The Lord of the Rings" at a garage s..

S3E16 - The Excelsior Acq..

Sheldon winds up in traffic court when he gets a ticket because of P..

S3E15 - The Large Hadron ..

Leonard can only bring one guest on a trip to see CERN's Large Hadro..

S3E14 - The Einstein Appr..

Sheldon's search for the answer to a physics problem leads him to wo..

S3E13 - The Bozeman React..

A robbery of their apartment sees Leonard and Sheldon call on their ..

S3E12 - The Psychic Vortex

Leonard is aghast to find out a secret of Penny's: she believes in p..

S3E11 - The Maternal Cong..

Leonard's mother (Christine Baranski) visits, which pleases Sheldon ..

S3E10 - The Gorilla Exper..

Sheldon attempts to help Penny understand Leonard's work, and Wolowi..

S3E9 - The Vengeance Form..

Barry Kripke embarrasses Sheldon on NPR, and the gang rallies to hel..

S3E8 - The Adhesive Duck ..

With Leonard, Howard and Raj away camping in the desert, an injured ..

S3E7 - The Guitarist Ampl..

A squabble between Leonard and Penny sees Sheldon playing mediator, ..

S3E6 - The Cornhusker Vor..

Sheldon teaches Leonard how to understand football while a kite-figh..

S3E5 - The Creepy Candy C..

Sheldon seeks revenge on his nemesis, Wil Wheaton; Wolowitz wants Pe..

S3E4 - The Pirate Solution

Raj must find a new job or be sent back to India, but Sheldon has a ..

S3E3 - The Gothowitz Devi..

Howard takes Raj along to check out the Goth dating scene. Sheldon u..

S3E2 - The Jiminy Conject..

Sheldon and Howard wager comic books over a cricket's species. Meanw..

S3E1 - The Electric Can O..

Sheldon flees back to Texas in disgrace when he learns the guys tamp..

S2E23 - The Monopolar Exp..

Leonard and Penny come to terms with their feelings for each other, ..

S2E22 - The Classified Ma..

Penny's second date with Stuart sees her making a comment that gives..

S2E21 - The Vegas Renorma..

Leonard and Koothrappali take a heartbroken Wolowitz to Las Vegas, l..

S2E20 - The Hofstadter Is..

A fellow comic book enthusiast's hitting on Penny leads to Leonard a..

S2E19 - The Dead Hooker J..

Penny feels threatened when another sexy woman moves into the apartm..

S2E18 - The Work Song Nan..

Penny's business selling hair products out of her apartment gets out..

S2E17 - The Terminator De..

The gang is thrilled when they learn Terminator: The Sarah Connor Ch..

S2E16 - The Cushion Satur..

Paintball leads to a squabble between Sheldon and Penny, as well as ..

S2E15 - The Maternal Capa..

Leonard suffers through a dreadful visit from his mother (Christine ..

S2E14 - The Financial Per..

Sheldon helps Penny with a financial crisis, but his solution leads ..

S2E13 - The Friendship Al..

Sheldon creates a scientific procedure for making friends.

S2E12 - The Killer Robot ..

Penny's criticism of Wolowitz's romantic life pushes him into depres..

S2E11 - The Bath Item Gif..

Penny informs Sheldon that she intends to give gifts to him and Leon..

S2E10 - The Vartabedian C..

Leonard's relationship with Stephanie is moving too fast for him, so..

S2E9 - The White Asparagu..

Sheldon is overexuberant that Leonard finally has a girlfriend match..

S2E8 - The Lizard-Spock E..

A girl Wolowitz has a major crush on falls for Leonard.

S2E7 - The Panty Pinata P..

When Sheldon bans Penny from the apartment for numerous minor infrac..

S2E6 - The Cooper-Nowitzk..

Sheldon, and his friends, are mystified when a younger grad student ..

S2E5 - The Euclid Alterna..

An intervention is used to try to force Sheldon to overcome his fear..

S2E4 - The Griffin Equiva..

Full of confidence following getting a paper published, Raj hits on ..

S2E3 - The Barbarian Subl..

Sheldon creates a monster when he introduces Penny to online gaming.

S2E2 - The Codpiece Topol..

Leonard begins dating Sheldon’s nemesis, Leslie Winkle, after seei..

S2E1 - The Bad Fish Parad..

Penny opens up to a reluctant Sheldon after a less-than-stellar firs..

S1E17 - The Tangerine Fac..

Leonard comforts Penny after she breaks up with her boyfriend, again..

S1E16 - The Peanut Reaction

After finding out Leonard has never had a birthday party Penny decid..

S1E15 - The Pork Chop Ind..

When Sheldon's attractive twin sister Missy comes to visit the guys ..

S1E14 - The Nerdvana Anni..

Leonard buys a replica time machine online. As the boys move it into..

S1E13 - The Bat Jar Conje..

The guys decided to compete in a physics bowl but find Sheldon's sho..

S1E12 - The Jerusalem Dua..

Sheldon and Leonard look for a way to derail a 15-year-old physics p..

S1E11 - The Pancake Batte..

When Sheldon gets sick, Leonard and the boys know what's in store an..

S1E10 - The Loobenfeld De..

After hearing Penny sing, Leonard lies to avoid seeing her perform, ..

S1E9 - The Cooper-Hofstad..

When Sheldon and Leonard are invited to present their joint findings..

S1E8 - The Grasshopper Ex..

Koothrappali's parents want him to go out with another Indian woman ..

S1E7 - The Dumpling Paradox

When Wolowitz hooks up with Penny's old friend, it ruins "Halo Night..

S1E6 - The Middle Earth P..

The guys are invited to Penny's Halloween costume party. During the ..

S1E5 - The Hamburger Post..

Leonard and his colleague Leslie spend the night together. But Lesli..

S1E4 - The Luminous Fish ..

Sheldon's mother visits to get him out of the funk he's in after he ..

S1E3 - The Fuzzyboots Cor..

Leonard gets upset when he discovers that Penny is seeing a new guy,..

S1E2 - The Big Bran Hypot..

Penny is furious and more than a little freaked out with Leonard and..

S1E1 - Pilot

A pair of brilliant theoretical physicists meet a woman who shows th..

S1E0 - Unaired Pilot

The unreleased pilot of the Big Bang Theory featuring Leonard and Sh..