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200715 12 Seasons
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Jim Parsons won four Emmys and a Golden Globe for his portrayal of neurotic genius Sheldon Cooper.
Season 1Season 2Season 3Season 4Season 5Season 6Season 7Season 8Season 9Season 10Season 11Season 12
1. Pilot
23m
When a pretty girl named Penny moves across the hall, socially awkward scientist Leonard is instantly smitten, much to roommate Sheldon’s dismay.
2. The Big Bran Hypothesis
21m
Leonard offers to receive a package on Penny’s behalf, but things go awry when Sheldon feels the need to clean her apartment.
3. The Fuzzy Boots Corollary
22m
Leonard is devastated when he sees Penny kissing another man, and he asks her out on a date under the guise of a group dinner with the guys.
4. The Luminous Fish Effect
21m
Leonard calls in Sheldon’s mother when Sheldon becomes obsessed with weaving ponchos and illuminating fish after being fired from his job.
5. The Hamburger Postulate
20m
After agreeing to a sexual encounter with Leslie, Leonard becomes upset when he learns she was only interested in him as a one-night stand.
6. The Middle Earth Paradigm
21m
The guys go well outside their comfort zone when they accept an invitation to Penny’s Halloween party, where Leonard has a run-in with Penny’s ex.
7. The Dumpling Paradox
21m
When Penny’s friend hooks up with Howard in her apartment, Penny has to crash with the guys … and becomes the fourth member of their Halo team.
8. The Grasshopper Experiment
20m
After being set up on a date, shy Raj realizes he’s able to talk to women if he’s drinking. But he gets too wasted and his date leaves with Sheldon.
9. The Cooper-Hofstadter Polarization
19m
Leonard and Sheldon are invited to an academic conference to present research they conducted together, but Sheldon doesn’t want to participate.
10. The Loobenfeld Decay
21m
Leonard and Sheldon lie to avoid seeing Penny’s bad singing, but Sheldon takes the ruse to unnecessary extremes by inventing a drug-addicted cousin.
11. The Pancake Batter Anomaly
22m
When germophobe Sheldon gets sick, the guys take off and leave Penny with the task of taking care of the demanding, obnoxious patient.
12. The Jerusalem Duality
20m
A 15-year-old prodigy pushes Sheldon out of physics research, so he tries to win the Nobel Prize by proposing a replica of Jerusalem in Mexico.
13. The Bat Jar Conjecture
22m
Sheldon’s selfish showboating on the guys’ physics bowl team gets him kicked off and replaced by Leslie, leaving him to form his own ragtag team.
14. The Nerdvana Annihilation
20m
Penny gets mad at the guys when they buy a full-scale model of a time machine, leading Leonard to get rid of all of his collectibles.
15. The Pork Chop Indeterminacy
22m
Leonard, Howard and Raj all become interested in Sheldon’s twin sister, Missy, but Sheldon deems all three of them unsuitable to date her.
16. The Peanut Reaction
20m
Penny plans a surprise birthday party for Leonard, but things go wrong when Sheldon forgets to buy a present and Howard has a bad reaction to peanuts.
17. The Tangerine Factor
20m
After Penny has a bad breakup with her boyfriend, she agrees to go on a date with Leonard and both seek advice from Sheldon.
1. The Bad Fish Paradigm
22m
When Penny divulges a secret to Sheldon, he fears he won’t be able to keep it from Leonard and decides to move out.
2. The Codpiece Topology
21m
Leonard is caught in the middle when he resumes a relationship with Leslie Winkle, a fellow physicist who’s Sheldon’s archenemy.
3. The Barbarian Sublimation
21m
When Penny gets locked out of her apartment, Sheldon invites her in and introduces her to an online video game that quickly takes over her life.
4. The Griffin Equivalency
21m
When a magazine write-up goes to Raj’s head, he’s forced to apologize to Penny, who gets the brunt of his obnoxious behavior.
5. The Euclid Alternative
20m
When Leonard’s new schedule makes it impossible for him to drive Sheldon to work, the gang holds an intervention to force Sheldon to get his license.
6. The Cooper-Nowitzki Theorem
21m
Sheldon becomes distressed when an admiring grad student forces his way into his life and declares herself his assistant.
7. The Panty Piñata Polarization
21m
Penny’s faux pas sets off an escalating feud with Sheldon that Leonard decides to end by calling in the ultimate weapon: Sheldon’s mother.
8. The Lizard-Spock Expansion
20m
Howard loses a potential girlfriend to Leonard, and Sheldon expands the classic game of rock-paper-scissors to include Mr. Spock and a lizard.
9. The White Asparagus Triangulation
21m
Believing that Dr. Stephanie Barnett is Leonard’s ideal mate, Sheldon goes overboard to prove to her how great Leonard is.
10. The Vartabedian Conundrum
21m
Penny is the only one who seems to understand that Leonard’s new girlfriend has moved into his and Sheldon’s apartment.
11. The Bath Item Gift Hypothesis
21m
Sheldon becomes obsessed with finding the perfect Christmas gift for Penny, and Leonard is crushed when a cool fellow scientist starts dating Penny.
12. The Killer Robot Instability
21m
The guys plan to enter a robot fighting championship, but things take a disastrous turn when Sheldon learns that Barry Kripke has his own robot.
13. The Friendship Algorithm
21m
When he hears that rival scientist Barry Kripke has access to a new computer, Sheldon goes to great lengths to try to become his friend.
14. The Financial Permeability
21m
When they learn of Penny’s financial problems, Sheldon lends her money and Leonard attempts to get Penny’s ex-boyfriend to repay an old loan.
15. The Maternal Capacitance
21m
Leonard’s distress over a visit from his mother, a judgmental psychiatrist, only grows when his friends bond with her as he never has.
16. The Cushion Saturation
21m
Howard strikes up a romance with Leonard’s ex-girlfriend Leslie Winkle, and Penny accidentally hits Sheldon’s spot on the couch with a paintball gun.
17. The Terminator Decoupling
21m
The guys geek out when they learn that they’re aboard the same San Francisco-bound train as Summer Glau of “Terminator: The Sarah Connor Chronicles.”
18. The Work Song Nanocluster
20m
The guys pitch in to help make and sell Penny’s handmade floral barrettes, but they can’t keep up when the product proves successful.
19. The Dead Hooker Juxtaposition
20m
The guys grow infatuated with a sexy new neighbor, who has no problem using them to get what she wants. But Penny sees right through her.
20. The Hofstadter Isotope
20m
Comic book shop owner Stuart asks Penny out on a date, prompting a jealous Leonard to visit a bar with Howard and Raj in search of romance.
21. The Vegas Renormalization
22m
When Leslie breaks up with Howard, Raj and Leonard cheer him up with a trip to Las Vegas. Meanwhile, Sheldon spends the night at Penny’s apartment.
22. The Classified Materials Turbulence
19m
Howard’s celebration for the debut of his International Space Station toilet is short-lived when he realizes that it will explode after ten flushes.
23. The Monopolar Expedition
21m
Sheldon gets a grant to spend three months at the North Pole and asks the guys to go with him, but Leonard hesitates at being away from Penny so long.
1. The Electric Can Opener Fluctuation
22m
Back from the North Pole, the guys reveal that they doctored Sheldon’s experiment results as a prank, causing him to flee home to Galveston in anger.
2. The Jiminy Conjecture
21m
When their first romantic evenings go awry, Penny and Leonard agree to return to just being friends, even though it’s not what either one wants.
3. The Gothowitz Deviation
20m
Sheldon deals with Penny’s frequent visits to Leonard’s room by conditioning her with chocolate; Raj and Howard enjoy a goth-themed night out.
4. The Pirate Solution
21m
Raj must get a new job or face deportation when his research ends, so Sheldon hires him as an assistant, a situation that soon goes to Sheldon’s head.
5. The Creepy Candy Coating Corollary
21m
Penny sets Howard up with one of her friends, and Sheldon enters a collectible card game tournament to get revenge on guest player Wil Wheaton.
6. The Cornhusker Vortex
20m
Leonard tries to fit in when Penny throws a party to watch a football game, and Raj develops abandonment issues with Howard.
7. The Guitarist Amplification
19m
Leonard and Penny’s bickering drives Sheldon to stay with Raj and then Howard, but their fights with their parents are just as disturbing.
8. The Adhesive Duck Deficiency
21m
Sheldon helps Penny when she slips in the shower. Raj, Leonard and Howard’s meteor shower viewing party gets a boost from some “magic” cookies.
9. The Vengeance Formulation
19m
Bernadette asks Howard where their relationship is headed, and Barry Kripke pulls a prank on Sheldon during an NPR interview.
10. The Gorilla Experiment
21m
Bernadette’s interest in physics draws her to Leonard, sending a jealous Penny to Sheldon for a crash course on the subject.
11. The Maternal Congruence
20m
When Leonard’s mother visits at Christmas, he finds out that his parents are getting divorced — which Sheldon has known about for weeks.
12. The Psychic Vortex
19m
Leonard makes fun of Penny for consulting a psychic, then makes it up to her by visiting one himself. Raj bribes Sheldon to act as his wingman.
13. The Bozeman Reaction
20m
When his apartment is burglarized, Sheldon begins to feel unsafe in Pasadena and researches new places to live.
14. The Einstein Approximation
19m
Sheldon hopes that a menial job will clear his mind enough to solve a tough problem. Meanwhile, the rest of the gang enjoys roller disco night.
15. The Large Hadron Collision
21m
When Leonard is invited to visit Switzerland’s Large Hadron Collider, his decision to bring Penny along leaves Sheldon feeling betrayed.
16. The Excelsior Acquisition
21m
Sheldon learns that he must be in court to fight a traffic ticket the same day that Stan Lee is due to appear at the comic book store.
17. The Precious Fragmentation
20m
The guys find life imitating art when the “Lord of the Rings” ring they bought at a garage sale turns out to be the one actually used in the films.
18. The Pants Alternative
21m
Nervous about a speech, Sheldon gets advice and help from Penny, Leonard and Raj … then gives the speech drunk on the big night.
19. The Wheaton Recurrence
21m
Leonard is stunned when Penny responds “thank you” to his “I love you,” and Sheldon sees a chance to get back at Wil Wheaton while bowling.
20. The Spaghetti Catalyst
20m
When Penny and Leonard break up, Sheldon continues his friendship with Penny, which Raj and Howard tell him just isn’t done when a buddy gets dumped.
21. The Plimpton Stimulation
21m
A physicist visiting from Princeton creates waves when she has a one-night stand with Leonard, then takes up with Raj and Howard.
22. The Staircase Implementation
20m
A feud between Leonard and Sheldon prompts Penny to ask why the two live together in the first place, and Leonard tells her in a series of flashbacks.
23. The Lunar Excitation
20m
The guys’ lunar experiment party turns ugly, thanks to Penny’s date. Meanwhile, an online dating site matches Sheldon with Amy Farrah Fowler.
1. The Robotic Manipulation
21m
Howard is attacked by a robotic arm he borrowed from the Jet Propulsion Laboratory, and Penny chaperones Sheldon’s first date with Amy Farrah Fowler.
2. The Cruciferous Vegetable Amplification
21m
A freak accident causes Sheldon to interact with others remotely via the Mobile Virtual Presence Device (MVPD), which Penny fittingly dubs “Shel-Bot.”
3. The Zazzy Substitution
21m
Sheldon and Amy grow closer every day, until a minor disagreement causes them to split and Sheldon to seek solace by adopting 25 cats.
4. The Hot Troll Deviation
20m
A chance meeting gives Howard a second chance with Bernadette, and Raj battles Sheldon over the addition of a desk in their office.
5. The Desperation Emanation
21m
Sheldon avoids Amy when she wants to introduce him to her mother, and Howard and Bernadette set Leonard up with an obnoxious blind date.
6. The Irish Pub Formulation
22m
Leonard’s secret tryst with Raj’s sister Priya prompts the guys to admit years’ worth of secrets they’ve kept from one another.
7. The Apology Insufficiency
21m
Interviewed for Howard’s security clearance, Sheldon blabs about the Mars Rover crash, Raj is nearly deported, and Leonard hits on the interviewer.
8. The 21-Second Excitation
19m
Sheldon steals a print of “Raiders of the Lost Ark” from a theater, and Amy proves socially inept during a girls’ night with Penny and Bernadette.
9. The Boyfriend Complexity
21m
When her father visits, Penny asks Leonard to pretend that they’re still together, since he’s the only one of her boyfriends her dad has ever liked.
10. The Alien Parasite Hypothesis
20m
When Amy is attracted to Penny’s ex, she describes these new feelings to a jealous Sheldon, who argues that she must be hosting an alien parasite.
11. The Justice League Recombination
20m
The guys dress as the Justice League for a New Year’s Eve party at Stuart’s comic book shop, but Penny ditches to join her ex at a different event.
12. The Bus Pants Utilization
21m
Leonard and Sheldon nearly come to blows over the development of a mathematics smartphone app, which has turned Sheldon into a megalomaniac.
13. The Love Car Displacement
21m
Sharing cars and hotel rooms causes multiple issues when the entire group heads to Big Sur for a science conference.
14. The Thespian Catalyst
21m
Sheldon asks Penny for acting lessons to help him become more at ease at his new teaching job, and Raj fantasizes about Bernadette.
15. The Benefactor Factor
20m
Leonard is honored when wealthy, elderly benefactor Mrs. Latham invites him for dinner, until he learns that he must sleep with her for a donation.
16. The Cohabitation Formulation
20m
Angered by his dependence on his mother, Bernadette insists that Howard move in with her; Leonard is thrilled that Priya has come to visit.
17. The Toast Derivation
21m
When Amy calls Leonard the nucleus of their social group, Sheldon forms a new group, including his rival Barry Kripke, Penny’s ex and LeVar Burton.
18. The Prestidigitation Approximation
21m
Priya pushes Leonard to end his friendship with Penny, and Sheldon becomes obsessed with figuring out Howard’s card trick.
19. The Zarnecki Incursion
21m
The guys take a road trip to confront the hacker who pillaged Sheldon’s World of Warcraft account, and the girls confront Priya about her attitude.
20. The Herb Garden Germination
21m
Penny’s rumor that Bernadette and Howard are breaking up leads the friends to panic and Amy to conduct an experiment in gossip.
21. The Agreement Dissection
21m
Leonard’s intensifying relationship with Priya violates multiple clauses in his roommate agreement with Sheldon, who’s forced to rebuild the document.
22. The Wildebeest Implementation
21m
When Priya invites Howard and Bernadette on a double date with her and Leonard, Penny uses the opportunity to get back at her.
23. The Engagement Reaction
20m
Bernadette takes it personally when Howard’s mother collapses upon hearing of their engagement, and Priya and Penny compare notes on Leonard.
24. The Roommate Transmogrification
21m
Bernadette buys Howard a Rolex to celebrate her PhD and new job, and Raj becomes Sheldon’s temporary roommate.
1. The Skank Reflex Analysis
21m
Raj is on everyone’s lips when he sleeps with Penny and admits to fantasizing about Bernadette; Sheldon leads the department paintball team.
2. The Infestation Hypothesis
20m
Sheldon’s germ phobia goes into overdrive when Penny announces that the new chair he loves was salvaged from the side of the road.
3. The Pulled Groin Extrapolation
20m
Sheldon grows jealous when Amy takes Leonard as her date to a wedding. Meanwhile, Bernadette clashes with Howard about his mother.
4. The Wiggly Finger Catalyst
20m
Penny sets up Raj with her friend Emily, and the two hit it off. But Emily’s motives soon become apparent to everyone but him.
5. The Russian Rocket Reaction
21m
Howard is thrilled to be going into space, but Bernadette fears for his safety. Meanwhile, Sheldon and Leonard are invited to a party by Wil Wheaton.
6. The Rhinitis Revelation
21m
Sheldon’s mother is in town for a few days as she waits for her cruise to set sail, but ends up spending her time with everyone but him.
7. The Good Guy Fluctuation
20m
Leonard is tempted to cheat on Priya with Alice, a girl he met at the comic book store. Meanwhile, Sheldon seeks revenge for a Halloween prank.
8. The Isolation Permutation
21m
Amy is devastated when Bernadette and Penny don’t invite her to go shopping for bridesmaids dresses, but Sheldon doesn’t know how to comfort her.
9. The Ornithophobia Diffusion
21m
A fight erupts when Penny and Leonard go to the movies as friends; Sheldon tries to rid the apartment of a bird that has him terrified.
10. The Flaming Spittoon Acquisition
21m
Stuart asks Amy out, prompting a jealous Sheldon to ask Penny for a date out of spite. She refuses, but gives him advice on how to make Amy happy.
11. The Speckerman Recurrence
20m
Leonard is contacted by a guy who bullied him in high school and hasn’t changed. The incident prompts Penny to admit she was once a bully herself.
12. The Shiny Trinket Maneuver
21m
Sheldon buys Amy something pretty to make up for insulting her recent publication, and Bernadette reveals to Howard that she doesn’t want children.
13. The Recombination Hypothesis
21m
Leonard and Penny reconcile, but agree that they should progress slowly and keep their relationship secret, which has its drawbacks.
14. The Beta Test Initiation
20m
Penny and Leonard try starting their relationship again, Raj falls in love with Siri, and Sheldon and Amy launch the “Fun with Flags” webcast.
15. The Friendship Contraction
20m
When Sheldon gets on Leonard’s bad side, it doesn’t take long to discover how much he relies on him in virtually every aspect of his life.
16. The Vacation Solution
21m
Sheldon spends his mandatory vacation “helping” Amy at her lab, and Bernadette’s father wants Howard to sign a prenuptial agreement.
17. The Rothman Disintegration
21m
Sheldon and Barry Kripke play basketball to see who gets a vacant office, and Amy gives Penny an enormous, unflattering portrait of the two of them.
18. The Werewolf Transformation
21m
When his regular barber falls ill, Sheldon refuses to let anyone else cut his hair, and his lifestyle starts to change to reflect his longer locks.
19. The Weekend Vortex
20m
The guys’ plans for a weekend-long gaming marathon is derailed by Amy’s aunt’s 93rd birthday party, Bernadette’s presence and other girlfriend issues.
20. The Transporter Malfunction
21m
Sheldon has a crisis of conscience when he swaps his broken vintage Star Trek transporter for Leonard’s identical — and unbroken — specimen.
21. The Hawking Excitation
19m
When he’s asked to maintain Stephen Hawking’s wheelchair during a guest lecture series, Howard realizes he has Sheldon in the palm of his hand.
22. The Stag Convergence
21m
Raj’s drunken toast at Howard’s bachelor party goes viral (thanks to Wil Wheaton), sending Bernadette on the warpath.
23. The Launch Acceleration
21m
Howard’s wedding plans are shaken up when NASA changes his launch schedule. Meanwhile, Leonard and Penny take their relationship to the next level.
24. The Countdown Reflection
20m
While waiting for the countdown for his voyage into space, Howard reflects on the previous days, including his impromptu wedding to Bernadette.
1. The Date Night Variable
21m
Poor Raj is a third wheel on two different dates before he finally finds company. Wolowitz is nagged by his mother even though he’s in outer space.
2. The Decoupling Fluctuation
21m
Penny is uncertain about her feelings for Leonard, which upsets Sheldon. Stuart is allowed to join the gang if he follows Sheldon’s strict conditions.
3. The Higgs Boson Observation
19m
While Wolowitz wrestles with cabin fever, Sheldon provokes a chain reaction of jealousy by hiring an attractive assistant to sort his old papers.
4. The Re-Entry Minimization
21m
Wolowitz is distressed by the lukewarm reception he receives when he returns home from space, while Sheldon gets ultra-competitive during game night.
5. The Holographic Excitation
21m
Raj and Stuart throw a Halloween bash, but it seems like the only one in a party mood is Penny, who gets turned on every time Leonard talks science.
6. The Extract Obliteration
21m
Sheldon gets competitive while playing a word game with Stephen Hawking, and Penny is infuriated by Leonard’s attempt to help her with her homework.
7. The Habitation Configuration
21m
Wil Wheaton comes between Sheldon and Amy. Bernadette has second thoughts about forcing Howard to finally move out of his mother’s house.
8. The 43 Peculiarity
21m
Raj and Howard go to extreme lengths to uncover Sheldon’s secret afternoon activity, and Penny reveals how she really feels about Leonard.
9. The Parking Spot Escalation
20m
Even though Sheldon doesn’t drive, he’s infuriated when Howard gets his parking spot at work, and their feud makes the whole gang miserable.
10. The Fish Guts Displacement
21m
Howard finds surprising common ground with his father-in-law, while Amy relishes receiving some TLC from Sheldon when she’s sick with the flu.
11. The Santa Simulation
21m
Sheldon reveals the reason for his deep-seated dislike of Santa Claus and Christmas, while Raj bonds with Amy over drinks during a girls’ night out.
12. The Egg Salad Equivalency
21m
Sheldon gets all the guys in trouble with Human Resources when he uses inappropriate language to talk to Alex about hitting on a clueless Leonard.
13. The Bakersfield Expedition
21m
The guys run into bad luck on a road trip to the Bakersfield Comic-Con. Back home, the girls discover that comic books aren’t so bad.
14. The Cooper/Kripke Inversion
20m
Sheldon makes a shocking admission after a clash with Kripke jolts his self-confidence. Bernadette is furious when Howard spends too much money.
15. The Spoiler Alert Segmentation
21m
After a fight with Sheldon, Leonard decides to move in with Penny, causing a chain reaction of unhappy roommates moving from apartment to apartment.
16. The Tangible Affection Proof
21m
Valentine’s Day, a holiday loathed by all, arrives and prompts the various couples in the gang to celebrate in ways both typical and surprising.
17. The Monster Isolation
19m
Raj and Lucy have a hard time connecting; Sheldon and the gang are floored by Penny’s performance in “A Streetcar Named Desire.”
18. The Contractual Obligation Implementation
20m
Sheldon, Howard and Leonard have trouble inspiring tween girls to take an interest in science, while Raj and Lucy find the perfect way to communicate.
19. The Closet Reconfiguration
20m
The gang does its best to cheer up an anxious Howard after Sheldon unearths an unopened letter that Howard’s father sent him on his 18th birthday.
20. The Tenure Turbulence
19m
The competition gets fierce when a tenured position opens up at the university, and it turns out that Ms. Davis from HR is on the deciding committee.
21. The Closure Alternative
20m
Amy tries to help Sheldon overcome his compulsive need for closure, while Raj reacts badly to revelations in Lucy’s blog about his feminine side.
22. The Proton Resurgence
21m
Sheldon and Leonard are thrilled to meet their childhood hero, TV scientist Professor Proton, but their anticipated party does not go as planned.
23. The Love Spell Potential
21m
A weekend of “Dungeons and Dragons” goes awry when Raj leaves for a date with Lucy and Amy gets anxious about Sheldon’s reluctance to become intimate.
24. The Bon Voyage Reaction
20m
The gang has mixed reactions when Leonard gets a work opportunity that will require him to be away for the summer, and Raj makes a major breakthrough.
1. The Hofstadter Insufficiency
21m
Sheldon tries to comfort Penny, who’s worried Leonard is having too good a time on the North Sea, while Raj gets on the wrong side of the head of HR.
2. The Deception Verification
21m
When Sheldon learns that Leonard came home early to be with Penny, his feelings are hurt. Howard can’t understand why he’s feeling fat and vulnerable.
3. The Scavenger Vortex
21m
When the gang competes in a cutthroat scavenger hunt designed by Raj, it brings out the best — and worst — in everyone.
4. The Raiders Minimization
21m
After Amy ruins one of Sheldon’s favorite movies, he seeks revenge. Meanwhile, Leonard discovers a way to get Penny to do his bidding.
5. The Workplace Proximity
19m
Sheldon must decide how much “Amy time” is too much after she takes a job at his university, putting their relationship to the test.
6. The Romance Resonance
21m
Sheldon’s latest scientific breakthrough makes him feel like a fraud, and Howard’s romantic gesture prompts Penny to step up her game with Leonard.
7. The Proton Displacement
20m
After Prof. Proton slights Sheldon, he seeks revenge by befriending rival TV host Bill Nye, the science guy. Meanwhile, Howard crashes a girls’ night.
8. The Itchy Brain Simulation
20m
Leonard fails to keep Sheldon from overreacting when a past mistake comes to light. As penance, Leonard has to “walk a mile in Sheldon’s shoes.”
9. The Thanksgiving Decoupling
19m
Sheldon protests when the gang drags him to Mrs. Wolowitz’s house for Thanksgiving. Meanwhile, Penny and Leonard deal with a mistake from her past.
10. The Discovery Dissipation
19m
Leonard and Amy help Sheldon cope with the shame he’s feeling after his accidental contribution to science is disproved.
11. The Cooper Extraction
21m
While Sheldon is away, everyone gathers to decorate the Christmas tree and imagines what their lives would be like had they never met him.
12. The Hesitation Ramification
21m
When Penny’s big acting break on “NCIS” is a bust, Leonard struggles to help her, which prompts Penny to ask him a bold relationship question.
13. The Occupation Recalibration
20m
When Sheldon is forced to take a vacation, he tries to relax but instead spends a lot of time with Penny after she quits her job.
14. The Convention Conundrum
21m
When the guys can’t get Comic-Con tickets, Sheldon decides to hold his own convention and ends up spending a wild night with James Earl Jones.
15. The Locomotive Manipulation
20m
Amy persuades Sheldon to join her — along with Howard and Bernadette — for a romantic weekend in Napa Valley to celebrate Valentine’s Day.
16. The Table Polarization
20m
When Leonard buys a table, it causes Sheldon to reevaluate the changes in his life. Meanwhile, Wolowitz is offered a chance to go back into space.
17. The Friendship Turbulence
19m
Bernadette tries to make peace between Howard and Sheldon by having them travel together to Houston in an attempt to mend their friendship.
18. The Mommy Observation
21m
When Sheldon visits his mom, he’s forced to confront a new reality. Meanwhile, Raj’s murder-mystery party starts some fights within the gang.
19. The Indecision Amalgamation
19m
While Raj is wracked with guilt over dating two women at the same time, Penny wrestles with whether to take a role in a cheesy movie.
20. The Relationship Diremption
21m
Sheldon faces a personal crisis after deciding he’s wasting his time with string theory. Meanwhile, a double date ends in embarrassment.
21. The Anything Can Happen Recurrence
19m
Leonard tries to help Sheldon free his mind by reinstating “Anything Can Happen Thursday,” and Raj seeks Howard’s help to prepare for a date.
22. The Proton Transmogrification
21m
Prof. Proton helps Sheldon cope with grief, while Leonard turns a relationship milestone into a competition with Penny.
23. The Gorilla Dissolution
19m
A horrible day at work prompts Penny to reevaluate her life choices. Meanwhile, Howard and Bernadette struggle to care for bedridden Mrs. Wolowitz.
24. The Status Quo Combustion
21m
With his entire world changing around him, Sheldon is forced to confront an uncertain future. Meanwhile, Raj and Emily take things to the next level.
1. The Locomotion Interruption
21m
Sheldon is ready to come home after an incident on the train, so Amy and Leonard pick him up in Arizona. Penny interviews at Bernadette’s company.
2. The Junior Professor Solution
20m
Sheldon becomes a junior professor, but he’s required to teach a class. Amy enjoys being in the middle when Penny and Bernadette have a disagreement.
3. The First Pitch Insufficiency
19m
NASA asks Howard to throw out the first pitch at an Angels game. Sheldon and Amy outscore Leonard and Penny on a compatibility test.
4. The Hook-Up Reverberation
19m
Raj’s girlfriend, Emily, finally meets Penny. Meanwhile, the guys consider investing in Stuart’s comic book store.
5. The Focus Attenuation
19m
The girls head to Vegas for the weekend, but Penny spends her time working instead of having fun. Back at home, the guys try to invent a hoverboard.
6. The Expedition Approximation
21m
Sheldon and Raj test whether they could survive a dark-matter research expedition in a salt mine. Leonard and Penny bicker about money.
7. The Misinterpretation Agitation
20m
A doctor mistakes Penny’s flirty sales pitch for attraction, while Amy and Bernadette debate whether female scientists should use their sex appeal.
8. The Prom Equivalency
20m
Sheldon panics when the girls decide to recreate prom night on the roof of his building, thinking Amy will be expecting him to make a move.
9. The Septum Deviation
20m
A distraught Sheldon tries to talk Leonard out of getting minor surgery. Meanwhile, Raj’s parents announce that they’re getting divorced.
10. The Champagne Reflection
19m
A professor’s death prompts Leonard, Howard and Raj to reflect on their own work. Bernadette finds out how her co-workers really feel about her.
11. The Clean Room Infiltration
19m
Raj swoops in to help Leonard and Howard deal with a work emergency. Amy throws an authentic Victorian Christmas party, irritating Sheldon.
12. The Space Probe Disintegration
20m
Leonard and Sheldon learn a lesson about compromise when Penny and Amy take them shopping for dresses. Howard tries to distract a nervous Raj.
13. The Anxiety Optimization
20m
Sheldon enlists his friends to annoy him, hoping it’ll put him in the right state of mind to make a breakthrough in his dark matter research.
14. The Troll Manifestation
21m
Sheldon and Leonard deal with a rude commenter after they publish a physics paper online. The girls take an embarrassing trip down memory lane.
15. The Comic Book Store Regeneration
20m
Stuart reopens the comic book store, Penny tries to help Sheldon stop dwelling on things and Howard receives some shocking news.
16. The Intimacy Acceleration
20m
Sheldon and Penny try out an experiment that supposedly makes people fall in love. The rest of the gang spends the evening at an escape room.
17. The Colonization Application
20m
Amy is upset when Sheldon applies to be part of a one-way mission to colonize Mars. Leonard has a risqué surprise for Penny.
18. The Leftover Thermalization
19m
A magazine fails to give Leonard credit for the paper he co-wrote with Sheldon, and they bicker during a dinner at Mrs. Wolowitz’s house.
19. The Skywalker Incursion
21m
Invited to speak in Berkeley, Leonard and Sheldon take a side trip to George Lucas’s ranch. At home, Howard and Bernadette argue about “Doctor Who.”
20. The Fortification Implementation
20m
Sheldon and Amy make a breakthrough in their relationship while building a blanket fort together. Penny appears on Wil Wheaton’s podcast.
21. The Communication Deterioration
19m
Sheldon and Howard try to take over a project that Raj is working on for NASA. Penny thinks about giving acting another try.
22. The Graduation Transmission
19m
Leonard is scheduled to give a commencement speech at his old high school, but his flight gets canceled. Raj can’t get his toy helicopter to work.
23. The Maternal Combustion
19m
Sheldon and Leonard’s mothers butt heads when they finally meet. Bernadette demands that Howard do his fair share of the housework.
24. The Commitment Determination
20m
After Sheldon hurts Amy’s feelings on the anniversary of their first date, she decides it’s time to reexamine their relationship.
1. The Matrimonial Momentum
19m
Leonard’s confession to Penny on their big day in Las Vegas creates a rift between them, while Sheldon and Amy also hit a bump in their relationship.
2. The Separation Oscillation
19m
Leonard meets up with Mandy as he and Penny each face fears about their relationship. Sheldon shoots an angry episode of “Fun with Flags.”
3. The Bachelor Party Corrosion
19m
Raj and Howard plan a bachelor party for Leonard, but just getting there will be an adventure. The girls have a bachelorette party at Penny’s place.
4. The 2003 Approximation
19m
After learning that Leonard and Penny will move in together, Sheldon tries to emotionally travel in time to 2003, before he knew Leonard, Penny and Amy.
5. The Perspiration Implementation
19m
The guys take up fencing in an effort to get more exercise. Stuart tries to figure out how to get more girls to come to his store.
6. The Helium Insufficiency
19m
Sheldon and Leonard need to find liquid helium quickly when Swedish scientists set out to prove their hypothesis. Amy tries a dating app.
7. The Spock Resonance
19m
Sheldon gets emotional during an interview with Wil Wheaton for a “Star Trek” documentary. Bernadette wants to start renovating Howard’s mom’s house.
8. The Mystery Date Observation
18m
Penny, Bernadette and Leonard spy on Amy’s date. Howard and Raj help Sheldon place an online ad to find a new girlfriend.
9. The Platonic Permutation
21m
Amy and Sheldon go to the aquarium together as friends. Howard reluctantly agrees to volunteer at a soup kitchen. Penny and Leonard host Thanksgiving.
10. The Earworm Reverberation
21m
Sheldon gets a song stuck in his head but can’t figure out what it is. Howard and Raj go overboard when they learn that their band has a fan.
11. The Opening Night Excitation
21m
Sheldon has to decide between spending time with Amy on her birthday and attending opening night of “Star Wars: The Force Awakens” with the guys.
12. The Sales Call Sublimation
18m
Penny uses Leonard to make a sales pitch to a psychiatrist. Sheldon and Raj discover an asteroid. Stuart moves out of Howard and Bernadette’s house.
13. The Empathy Optimization
19m
After being annoyed by sick Sheldon, everyone goes to Las Vegas to get away from him. Sheldon learns the value of empathy and apologizing.
14. The Meemaw Materialization
19m
Meemaw comes to visit, but things don’t go well when she meets Amy. Raj meets a girl he likes, prompting him to ponder his relationship with Emily.
15. The Valentino Submergence
20m
Sheldon and Amy host a Valentine’s Day episode of “Fun with Flags.” Howard and Bernadette stumble on a new pet. Leonard and Penny start to feel old.
16. The Positive Negative Reaction
19m
Howard freaks out when he hears big news, so the boys take him to a karaoke bar to calm him down. There, they come up with a new moneymaking idea.
17. The Celebration Experimentation
19m
Sheldon is reluctant to celebrate his birthday due to a bad childhood experience, but gives in when Amy and the others plan a big party for him.
18. The Application Deterioration
18m
The guys attempt to patent their idea but learn that the financial details will be sticky. Raj asks the girls for advice about Emily.
19. The Solder Excursion Diversion
21m
Amy buys Sheldon a new laptop, then learns something unusual about him. Howard and Leonard lie to their wives to see a screening of “Suicide Squad.”
20. The Big Bear Precipitation
19m
Amy, Penny, Leonard and Sheldon exchange secrets on a weekend trip to a cabin in the woods. Raj gets too involved in Bernadette’s personal life.
21. The Viewing Party Combustion
18m
A trivial disagreement between Leonard and Sheldon before a “Game of Thrones” viewing party devolves into a huge argument involving everyone.
22. The Fermentation Bifurcation
20m
Sheldon stays behind with Bernadette while everyone else goes to a wine tasting party. Raj gets into some hot water when he brings Claire along.
23. The Line Substitution Solution
18m
Leonard has Penny pick up his mother from the airport, and the two women struggle to make a connection. Sheldon hires Stuart to spend time with Amy.
24. The Convergence Convergence
20m
Leonard and Penny plan a second wedding for friends and family, but it creates parental strife. Howard thinks the government is after Raj and him.
1. The Conjugal Conjecture
22m
It’s an uncomfortable wedding day for Penny and Leonard when it appears that his dad and Sheldon’s mom may have hooked up and Penny’s family arrives.
2. The Military Miniaturization
19m
Air Force Col. Williams comes to see Howard about the quantum gyroscope. Bernadette is furious that someone at work has blabbed about her condition.
3. The Dependence Transcendence
20m
Bernadette confides in Raj she’s not sure about being a mom. When Penny goes with Amy to Bert’s party she’s shocked to hear about Amy’s reputation.
4. The Cohabitation Experimentation
20m
When Amy must leave her flooded apartment for weeks the logical thing to do is move in with Sheldon. Only Raj knows the sex of the Wolowitz baby.
5. The Hot Tub Contamination
20m
Penny and Sheldon bond to complain about Amy and Leonard. While Howard and Bernadette plan a babymoon, Raj and Stuart take over their hot tub.
6. The Fetal Kick Catalyst
18m
Penny is asked to sign autographs at a local fan convention, but it’s Leonard who’s the big hit. Sheldon and Amy host their first party together.
7. The Veracity Elasticity
21m
Sheldon and Amy return in “Fun with Flags.” Amy’s been lying to Sheldon about her apartment, and when he finds out, he has a big decision to make.
8. The Brain Bowl Incubation
19m
While working on a bioengineering project with Amy, Sheldon decides he wants them to have a baby. Raj is attracted to the office cleaning lady.
9. The Geology Elevation
19m
Sheldon has a hard time getting past his jealousy when Bert wins a huge grant. Howard’s remote control Stephen Hawking raises questions, and eyebrows.
10. The Property Division Collision
20m
Leonard and Sheldon go to war over dividing up their stuff. Raj and Stuart are in a frenzy trying to be the most helpful to Howard and Bernadette.
11. The Birthday Synchronicity
20m
Amy’s annual birthday ritual is interrupted when Bernadette goes into labor. The gang reflects on how much their lives have changed — except for Raj.
12. The Holiday Summation
21m
After the holidays Sheldon and Amy recall their trip to Texas to see his mother, and Leonard and Penny relive their argument over a Christmas tree.
13. The Romance Recalibration
19m
Leonard and Penny turn to Sheldon and Amy for relationship advice. Raj and Howard need math and science to fix a squeaky floor in the baby’s room.
14. The Emotion Detection Automation
19m
Sheldon attempts to gain empathy and insight from an emotions reader. Raj gathers all his old girlfriends for a focus group to see what went wrong.
15. The Locomotion Reverberation
20m
Leonard gives Sheldon a train experience holiday to get him out of the way so he and Howard can finish the project, then discover they need him back.
16. The Allowance Evaporation
18m
Amy feels Sheldon doesn’t understand relationships when he blabs intimate information. The gang thinks Raj is too financially dependent on his father.
17. The Comic-Con Conundrum
19m
Raj’s financial problems have him scrambling for money to go to Comic-Con, while Leonard and Penny outdo each other dreaming up couple’s costumes.
18. The Escape Hatch Identification
20m
When Raj needs to move into a cheaper place, the gang offers help, then Beverly puts her own analytical spin on everyone’s relationship issues.
19. The Collaboration Fluctuation
19m
Penny and Raj get along great when he moves in, leaving Leonard feeling like a third wheel. Sheldon and Amy’s professional and personal lives collide.
20. The Recollection Dissipation
19m
After working on two projects at once, Sheldon finally crashes and can’t remember the night before. Bernadette gets emotional about returning to work.
21. The Separation Agitation
20m
Bert has a hot new girlfriend. Could it have anything to do with his windfall? Howard, Bernadette and Stuart are anxious when Halley goes to daycare.
22. The Cognition Regeneration
20m
Leonard’s nervous when Penny gets a good job offer from her old boyfriend Zack. Sheldon pouts that he hasn’t reached his full potential soon enough.
23. The Gyroscopic Collapse
19m
The guys are restless after Col. Williams takes over their project. Amy gets a research opportunity requiring her to stay at Princeton for months.
24. The Long Distance Dissonance
19m
Ramona Nowitzki returns and resumes her obsessive interest in Sheldon while Amy is away. He’s the only one who doesn’t see it, until he finally does.
1. The Proposal Proposal
21m
Amy begins to have second thoughts about her response to Sheldon’s proposal. Howard and Bernadette freak out over some life-changing news.
2. The Retraction Reaction
21m
Leonard gives a candid public radio interview about the state of physics research. Amy and Bernadette commiserate over their unsung accomplishments.
3. The Relaxation Integration
20m
Sheldon’s anxiety over choosing the perfect wedding date spills over into his dreams. Bernadette’s new coworker intrigues singletons Raj and Stuart.
4. The Explosion Implosion
21m
Plagued by parenting doubts, Howard heads to the desert — with Sheldon in tow — to shoot off a model rocket. Penny bonds with Leonard’s mother.
5. The Collaboration Contamination
19m
Sheldon and Raj don’t react well when Amy enlists Howard’s help on a project. Penny discovers the secret to managing a high-maintenance genius.
6. The Proton Regeneration
21m
Wheeeeeeaton! Sheldon once again faces off with Wil Wheaton, this time over his beloved Professor Proton. Penny babysits Halley.
7. The Geology Methodology
20m
Sheldon’s scientific snobbery alienates a colleague looking for help on a research project. Raj seeks advice after he reconnects with Ruchi.
8. The Tesla Recoil
19m
Workplace distrust runs rampant when Leonard and Howard discover Sheldon’s secret project, and Bernadette fears she’s being undermined by a co-worker.
9. The Bitcoin Entanglement
19m
A potential Bitcoin payday leads the gang down memory lane, where Leonard learns how Penny really felt about him during one of their breakups.
10. The Confidence Erosion
21m
A breakup affects the group. Wedding planning causes tension between Sheldon and Amy. A sought-after consulting gig leads Raj to a personal epiphany.
11. The Celebration Reverberation
20m
It’s birthday time for Amy and Halley, but their celebrations don’t go as planned. Leonard feels like an underachiever compared to his sibling.
12. The Matrimonial Metric
20m
Sheldon and Amy take a scientific approach to the task of choosing a best man and maid of honor by running secret experiments on their friends.
13. The Solo Oscillation
21m
Sheldon boots Amy from the apartment so he can concentrate on his work. Meanwhile, Footprints on the Moon is back — and rocking out in a big way.
14. The Separation Triangulation
19m
A new romance lands Raj in the middle of a marital mess. A rekindled passion for string theory prompts Sheldon to ask Leonard and Penny for a favor.
15. The Novelization Correlation
21m
Sheldon copes with conflicting feelings when Wil Wheaton debuts as Professor Proton. Leonard receives some eye-opening feedback on his book.
16. The Neonatal Nomenclature
19m
With Bernadette overdue and over being pregnant, her friends do their best to help get things rolling. Amy inadvertently reveals a secret to Howard.
17. The Athenaeum Allocation
20m
An old nemesis holds the key to Sheldon and Amy’s perfect nuptials. A sleep-deprived Howard and Bernadette face a big decision about the future.
18. The Gates Excitation
20m
When Penny announces that she’s about to meet Bill Gates, the guys scheme to get in on the action. Bernadette’s one-track mommy mind frustrates Amy.
19. The Tenant Disassociation
21m
Leonard clashes with Sheldon over control of the building’s tenant board. Raj and Howard attempt to locate the owner of a high-end drone.
20. The Reclusive Potential
21m
The guys tag along when Sheldon gets invited to the remote cabin of an eccentric genius. Amy’s bachelorette party isn’t what she expected.
21. The Comet Polarization
20m
Complications ensue when Stuart’s comic book store suddenly becomes popular. Penny and Raj disagree over a celestial discovery.
22. The Monetary Insufficiency
19m
While Amy shops for wedding dresses with Penny and Bernadette, Sheldon tries to raise $500 million to fund his latest scientific theory.
23. The Sibling Realignment
20m
As Sheldon’s wedding day approaches, his mother issues an ultimatum over his brother. Howard and Bernadette’s kids spread an infectious disease.
24. The Bow Tie Asymmetry
22m
A scientific breakthrough, “Star Wars” trivia and heartfelt declarations of love make Sheldon and Amy’s wedding day a truly special occasion.
1. The Conjugal Configuration
20m
Sheldon and Amy’s honeymoon hits a scheduling snag, Leonard upsets Penny with an unflattering comparison and Raj sparks a Twitter war with a celebrity.
2. The Wedding Gift Wormhole
21m
While Sheldon and Amy try to decipher the meaning of Leonard and Penny’s wedding gift, Raj seeks matchmaking help and Stuart gets dating advice.
3. The Procreation Calculation
20m
Raj’s dating compatibility questionnaire leads to a possible match — and a revelation from Penny that surprises Leonard.
4. The Tam Turbulence
19m
When Sheldon refuses to see his childhood best friend, the gang tries to figure out what led to their rift. Bernadette and Penny meet Raj’s new flame.
5. The Planetarium Collision
19m
Sheldon wants Amy to spend more time on their super-asymmetry project. Raj seems reluctant to have Howard join his planetarium show.
6. The Imitation Perturbation
19m
On Halloween, Penny and Leonard share very different recollections of their first kiss, while Howard’s costume hurts Sheldon’s feelings.
7. The Grant Allocation Derivation
19m
Bernadette finds the perfect hideaway to de-stress after work. Leonard faces a tough decision when he’s tasked with handing out surplus grant money.
8. The Consummation Deviation
21m
On the cusp of taking his relationship with Anu to a new level, Raj reverts to an old pattern. Sheldon attempts to forge a bond with Amy’s parents.
9. The Citation Negation
20m
While helping Sheldon and Amy track down citations for their super-asymmetry paper, Raj and Leonard make a startling discovery.
10. The VCR Illumination
21m
When Sheldon needs a pep talk after a work setback, Leonard breaks out the big guns. Bernadette helps Howard pursue his long-ago magician dreams.
11. The Paintball Scattering
19m
The gang’s planned paintball game turns out to be the perfect opportunity for the assembled couples to hash out their relationship issues.
12. The Propagation Proposition
20m
Penny’s ex Zack reappears with an unusual request for the Hofstadters. Raj tries to salvage his relationship with Anu.
13. The Confirmation Polarization
20m
Sheldon and Amy receive good news on their super-asymmetry project, but their happiness is short-lived. Bernadette taps Penny for a new role at work.
14. The Meteorite Manifestation
19m
Sheldon helps Howard and Bernadette find a legal remedy to a neighbor’s intrusive renovation. Leonard feels left out when Raj works on a new project.
15. The Donation Oscillation
21m
To deliver on his promise to Zack, Leonard rebuffs Penny’s advances. Meanwhile, Bernadette decides to brave weightlessness to prove Howard wrong.
16. The D & D Vortex
20m
The gang angles for an invitation to the hottest game in town: Wil Wheaton’s celebrity-studded Dungeons & Dragons night.
17. The Conference Valuation
19m
Hang time with the Wolowitz kids leads to a realization for both Leonard and Sheldon. Penny entertains an intriguing offer while at a drug conference.
18. The Laureate Accumulation
21m
To boost Sheldon and Amy’s Nobel Prize campaign against their more PR-savvy rivals, the university hosts a laureate-packed reception in their honor.
19. The Inspiration Deprivation
20m
A stressed-out Amy begins to crack under the pressure of being a Nobel Prize candidate and potential role model for young women in science.
20. The Decision Reverberation
19m
Penny pushes Leonard to stop being such a people-pleaser. Raj grows frustrated when his scientific research is misconstrued.
21. The Plagiarism Schism
20m
Facing an ethical dilemma when they acquire information that could clear their path to the Nobel Prize, Sheldon and Amy seek advice from their friends.
22. The Maternal Conclusion
20m
The sudden attentiveness of Leonard’s visiting mother confuses and delights him. Raj comes to a big decision about his future with Anu.
23. The Change Constant
20m
Big news brings big changes for Sheldon and Amy, but as one tries to embrace the shake-up, the other wants everything to stay the same.
24. The Stockholm Syndrome
23m
In the series finale, secrets are revealed, hearts are broken and feelings declared as the gang’s journey comes full circle.
Watch offline
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This programme is…
Quirky
Cast
Johnny GaleckiJim ParsonsKaley CuocoSimon HelbergKunal NayyarMayim BialikMelissa Rauch
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