The Big Bang Theory
Cast & Crew
Johnny Galecki Leonard Hofstadter
Jim Parsons Sheldon Cooper
Kaley Cuoco Penny
Simon Helberg Howard Wolowitz
Kunal Nayyar Raj Koothrappali
Mayim Bialik Amy Farrah Fowler
Melissa Rauch Bernadette Rostenkowski
Chuck Lorre Executive Producer
Bill Prady Executive Producer
Steven Molaro Executive Producer
Mark Cendrowski Director
Anthony Rich Director
Chuck Lorre Screenwriter
Bill Prady Screenwriter
Kristy Cecil Producer
⨁Full Cast & Crew
Upcoming TV Airings
The airings below are based on a generic national schedule. Times and dates can vary by TV provider.
Tuesday, December 30
The Creepy Candy Coating Corollary
Season 3 • Episode 5
Sheldon seeks revenge on his nemesis; Wolowitz wants Penny to set him up with one of her friends.
Tuesday, December 30
The Locomotion Reverberation
Season 10 • Episode 15
Leonard and Wolowitz try to distract Sheldon when he slows the progress of their guidance system.
Tuesday, December 30
The Guitarist Amplification
Season 3 • Episode 7
Sheldon tries to make peace when Leonard and Penny get into an argument.
Tuesday, December 30
The Adhesive Duck Deficiency
Season 3 • Episode 8
Penny is forced to rely on Sheldon when she is injured while Howard, Leonard and Raj are away.
Tuesday, December 30
The Vengeance Formulation
Season 3 • Episode 9
After being humiliated on the radio, Sheldon vows to destroy Kripke.
Tuesday, December 30
The Gorilla Experiment
Season 3 • Episode 10
Sheldon tries to help Penny understand Leonard's work; Wolowitz gets jealous.
Tuesday, December 30
The Maternal Congruence
Season 3 • Episode 11
Leonard is horrified when his mother (Christine Baranski) visits.
Tuesday, December 30
The Psychic Vortex
Season 3 • Episode 12
Sheldon and Koothrappali attend a mixer; Leonard discovers that Penny believes in psychics.
Tuesday, December 30
The Bozeman Reaction
Season 3 • Episode 13
Leonard and Sheldon turn to their friends to create a state-of-the-art security system.
Tuesday, December 30
The Einstein Approximation
Season 3 • Episode 14
Sheldon tries to figure out the answer to a physics problem by working with Penny.
Wednesday, December 31
The Colonization Application
Season 8 • Episode 17
Amy finds out that Sheldon applied for a one-way mission to colonize Mars.
Wednesday, December 31
The Leftover Thermalization
Season 8 • Episode 18
A magazine article only credits Sheldon in an article about a paper he co-wrote with Leonard.
Wednesday, December 31
The Panty Piñata Polarization
Season 2 • Episode 7
Sheldon bans Penny from the apartment for a series of petty infractions; she vows to get revenge.
Wednesday, December 31
The Large Hadron Collision
Season 3 • Episode 15
Leonard must choose who to bring with him when he goes to see the Large Hadron Collider.
Wednesday, December 31
The Excelsior Acquisition
Season 3 • Episode 16
Sheldon ends up in traffic court after getting a ticket because of Penny.
Wednesday, December 31
The Precious Fragmentation
Season 3 • Episode 17
A ring from "The Lord of the Rings" at a garage sale threatens to tear the guys apart.
Wednesday, December 31
The Pants Alternative
Season 3 • Episode 18
Sheldon's stage fright stands between him and a coveted award.
Wednesday, December 31
The Wheaton Recurrence
Season 3 • Episode 19
Penny and Leonard have a fight that threatens their relationship; Sheldon and Wil Wheaton face off.
Wednesday, December 31
The Allowance Evaporation
Season 10 • Episode 16
Sheldon and Amy have a fight; Koothrappali stops receiving financial support from his father.
Wednesday, December 31
The Plimpton Stimulation
Season 3 • Episode 21
Sheldon invites a famous physicist to the apartment, and competes with Leonard for her attention.
Wednesday, December 31
The Staircase Implementation
Season 3 • Episode 22
Leonard tells Penny about how he met Sheldon and what happened to the elevator.
Wednesday, December 31
The Lunar Excitation
Season 3 • Episode 23
Raj and Howard set up an online dating profile for Sheldon and find the perfect woman.
Wednesday, December 31
The Robotic Manipulation
Season 4 • Episode 1
Penny tags along on Sheldon's first date; Wolowitz finds a new use for a robotic arm.
Thursday, January 1
The Graduation Transmission
Season 8 • Episode 22
Wolowitz questions his engineering skills; a canceled flight puts Leonard's plans in jeopardy.
Thursday, January 1
The Maternal Combustion
Season 8 • Episode 23
When Sheldon's and Leonard's mothers finally meet, personalities collide.
Thursday, January 1
The Commitment Determination
Season 8 • Episode 24
While facing relationship changes, Sheldon pushes Penny and Leonard to choose a wedding date.
Thursday, January 1
The Love Car Displacement
Season 4 • Episode 13
Bernadette runs into her ex-boyfriend (Rick Fox) while attending a science event with Wolowitz.
Thursday, January 1
The Thespian Catalyst
Season 4 • Episode 14
Sheldon takes acting lessons from Penny in hope of becoming a better teacher.
Thursday, January 1
The Benefactor Factor
Season 4 • Episode 15
A wealthy donor makes Leonard question what he is willing to do for science.
Thursday, January 1
The Cohabitation Formulation
Season 4 • Episode 16
Wolowitz considers taking things with Bernadette to the next level.
Thursday, January 1
The Toast Derivation
Season 4 • Episode 17
Sheldon is upset when he realizes Leonard is the center of their group of friends.
Thursday, January 1
The Prestidigitation Approximation
Season 4 • Episode 18
Leonard must choose between Penny and his new girlfriend, Priya.
Thursday, January 1
The Zarnecki Incursion
Season 4 • Episode 19
The guys try to figure out who hacked Sheldon's online-game account.
Thursday, January 1
The Herb Garden Germination
Season 4 • Episode 20
Howard decides to take a big step in his relationship with Bernadette.
Thursday, January 1
The Agreement Dissection
Season 4 • Episode 21
Priya dissects the roommate agreement; the ladies take Sheldon dancing.
Thursday, January 1
The Wildebeest Implementation
Season 4 • Episode 22
Raj tries to cure his social anxiety; Penny spies on Leonard and his girlfriend through Bernadette.
Thursday, January 1
The Engagement Reaction
Season 4 • Episode 23
Howard's mom winds up in the hospital after hearing news of her son's engagement to Bernadette.
Thursday, January 1
The Roommate Transmogrification
Season 4 • Episode 24
Bernadette gets her Ph.D., inspiring the guys to tease Wolowitz about his lack of a doctorate.
Thursday, January 1
The Skank Reflex Analysis
Season 5 • Episode 1
Penny worries that she has ruined her relationship with her friends.
Thursday, January 1
The Infestation Hypothesis
Season 5 • Episode 2
Amy is caught in the middle when Penny and Sheldon argue over a pre-owned chair.
Thursday, January 1
The Pulled Groin Extrapolation
Season 5 • Episode 3
Bernadette, Howard and Mrs. Wolowitz spend the weekend together.
Thursday, January 1
The Wiggly Finger Catalyst
Season 5 • Episode 4
Raj wants a girlfriend, so Penny introduces him to a woman he can communicate with.
Thursday, January 1
The Russian Rocket Reaction
Season 5 • Episode 5
Wil Wheaton invites Leonard and Sheldon to a party at his house; Howard receives an opportunity.
Thursday, January 1
The Rhinitis Revelation
Season 5 • Episode 6
Sheldon finds himself competing with the gang for his mother's attention when she visits.
Thursday, January 1
The Comic-Con Conundrum
Season 10 • Episode 17
Koothrappali asks Sheldon to help him get out of debt; Penny considers joining Leonard at Comic-Con.
Thursday, January 1
The Cruciferous Vegetable Amplification
Season 4 • Episode 2
Sheldon realizes he will not live long enough to download his consciousness into a robot body.
Thursday, January 1
The Zazzy Substitution
Season 4 • Episode 3
When Sheldon searches for an alternative to human companionship, the guys become concerned.
Thursday, January 1
The Hot Troll Deviation
Season 4 • Episode 4
An embarrassing secret of Wolowitz's is revealed; Raj and Sheldon get into a war at work.
Thursday, January 1
The Desperation Emanation
Season 4 • Episode 5
Leonard realizes he is the only one in his group without a girlfriend.
Thursday, January 1
The Irish Pub Formulation
Season 4 • Episode 6
Leonard keeps an affair a secret from Sheldon, Howard and Raj.
Thursday, January 1
The Apology Insufficiency
Season 4 • Episode 7
Sheldon's interview with the FBI jeopardizes Wolowitz's security clearance.
Thursday, January 1
The Matrimonial Momentum
Season 9 • Episode 1
Penny must decide if she can get past Leonard's bad behavior.
Thursday, January 1
The Separation Oscillation
Season 9 • Episode 2
Leonard tries to ease Penny's mind; Sheldon plans a special episode of "Fun With Flags."
Friday, January 2
The Bachelor Party Corrosion
Season 9 • Episode 3
A flat tire during Leonard's bachelor party weekend in Mexico tests the guys' skills.
Friday, January 2
The 2003 Approximation
Season 9 • Episode 4
An impending change inspires Sheldon to revert to 2003, before he met Penny and Leonard.
Friday, January 2
The White Asparagus Triangulation
Season 2 • Episode 9
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
Friday, January 2
The 21-Second Excitation
Season 4 • Episode 8
The guys camp out for a movie screening; Penny and Bernadette invite Amy to her first slumber party.
Friday, January 2
The Boyfriend Complexity
Season 4 • Episode 9
Penny asks Leonard to lie to her father; an all-nighter at a telescope.
Friday, January 2
The Alien Parasite Hypothesis
Season 4 • Episode 10
Koothrappali and Wolowitz try to prove who would be a better superhero.
Friday, January 2
The Justice League Recombination
Season 4 • Episode 11
The guys try to bond with Penny's new boyfriend through a costume contest.
Friday, January 2
The Bus Pants Utilization
Season 4 • Episode 12
Leonard's idea for a smartphone application causes friction in his friendship with Sheldon.
Friday, January 2
The Love Car Displacement
Season 4 • Episode 13
Bernadette runs into her ex-boyfriend (Rick Fox) while attending a science event with Wolowitz.
Friday, January 2
The Thespian Catalyst
Season 4 • Episode 14
Sheldon takes acting lessons from Penny in hope of becoming a better teacher.
Friday, January 2
The Escape Hatch Identification
Season 10 • Episode 18
Leonard and Penny offer Sheldon's old room to Raj after he moves out of his apartment.
Friday, January 2
The Helium Insufficiency
Season 9 • Episode 6
Leonard and Sheldon try to secure the helium they need during a nation-wide shortage.
Friday, January 2
The Spock Resonance
Season 9 • Episode 7
Sheldon struggles to keep his emotions in check when he is interviewed for a documentary.
Saturday, January 3
The Mystery Date Observation
Season 9 • Episode 8
Sheldon, Wolowitz and Koothrappali post an ad online to find a new girlfriend for Sheldon.
Saturday, January 3
The Platonic Permutation
Season 9 • Episode 9
Amy and Sheldon spend Thanksgiving at the aquarium -- as friends.
Saturday, January 3
The Vartabedian Conundrum
Season 2 • Episode 10
Leonard asks Penny for advice when his new relationship starts moving too fast.
Saturday, January 3
The Bitcoin Entanglement
Season 11 • Episode 9
Sheldon tries to teach the guys a lesson after being cut out of a potentially valuable investment.
Saturday, January 3
The Confidence Erosion
Season 11 • Episode 10
Sheldon and Amy try to use math to eliminate wedding planning stress.
Saturday, January 3
The Celebration Reverberation
Season 11 • Episode 11
Sheldon plans a dinner for Amy's birthday; Leonard receives a Christmas letter from his brother.
Saturday, January 3
The Matrimonial Metric
Season 11 • Episode 12
Sheldon and Amy subject their friends to experiments; Penny reveals her feelings about Amy.
Saturday, January 3
The Solo Oscillation
Season 11 • Episode 13
Sheldon kicks Amy out to work solo; Amy and Leonard bond during a series of science experiments.
Saturday, January 3
The Separation Triangulation
Season 11 • Episode 14
Koothrappali learns the woman he's dating has a very upset husband; Sheldon rents his old room.
Saturday, January 3
The Novelization Correlation
Season 11 • Episode 15
Sheldon petitions Wil Wheaton to appear on his show, but Wil offers a role to Amy instead.
Saturday, January 3
The Neonatal Nomenclature
Season 11 • Episode 16
When Bernadette won't go into labor, her friends try different tactics to get things started.
Saturday, January 3
The Athenaeum Allocation
Season 11 • Episode 17
Leonard jumps through hoops to help secure the perfect wedding venue for Sheldon and Amy.
Saturday, January 3
The Gates Excitation
Season 11 • Episode 18
Penny gets the opportunity to host Bill Gates at work when his company wants to partner with hers.
Saturday, January 3
The Tenant Disassociation
Season 11 • Episode 19
Leonard decides to run against Sheldon for president of the tenants association.
Saturday, January 3
The Reclusive Potential
Season 11 • Episode 20
A brilliant but reclusive scientist invites Sheldon to his cabin in the middle of nowhere.
Saturday, January 3
The Zarnecki Incursion
Season 4 • Episode 19
The guys try to figure out who hacked Sheldon's online-game account.
Saturday, January 3
The Herb Garden Germination
Season 4 • Episode 20
Howard decides to take a big step in his relationship with Bernadette.
Saturday, January 3
The Opening Night Excitation
Season 9 • Episode 11
After dating for more than five years, Amy and Sheldon spend the night together for the first time.
Saturday, January 3
The Sales Call Sublimination
Season 9 • Episode 12
Leonard meets with a psychiatrist; Wolowitz and Bernadette struggle when Stuart moves out.
Sunday, January 4
The Empathy Optimization
Season 9 • Episode 13
Leonard, Penny and the gang attempt to treat themselves to a Sheldon-free weekend.
Sunday, January 4
The Meemaw Materialization
Season 9 • Episode 14
Sheldon's excitement about his Meemaw's visit fades when she butts heads with Amy.
Sunday, January 4
The Valentino Submergence
Season 9 • Episode 15
Amy and Sheldon host a Valentine's Day edition of Fun With Flags; Raj is torn between two women.
Sunday, January 4
The Comet Polarization
Season 11 • Episode 21
Friendships are threatened when Koothrappali takes credit for Penny's astronomical discovery.
Sunday, January 4
The Monetary Insufficiency
Season 11 • Episode 22
Sheldon tries to win money for science; Penny and Bernadette take Amy wedding dress shopping.
Sunday, January 4
The Sibling Realignment
Season 11 • Episode 23
Sheldon's mother won't attend his wedding unless he invites his brother.
Sunday, January 4
The Bow Tie Asymmetry
Season 11 • Episode 24
Amy's parents and Sheldon's family arrive; nearly everybody is focused on the wedding plans.
Sunday, January 4
The Conjugal Configuration
Season 12 • Episode 1
Penny and Leonard discover they are uncomfortably similar to Amy's parents.
Sunday, January 4
The Wedding Gift Wormhole
Season 12 • Episode 2
Sheldon and Amy go crazy trying to figure out what Leonard and Penny gave them for their wedding.
Sunday, January 4
The Procreation Calculation
Season 12 • Episode 3
Stuart starts bringing his new girlfriend home; Koothrappali explores an arranged marriage.
Sunday, January 4
The Tam Turbulence
Season 12 • Episode 4
Sheldon won't tell anyone why he's never mentioned Tam, his childhood best friend.
Sunday, January 4
The Planetarium Collision
Season 12 • Episode 5
When Amy doesn't have time to work on super-asymmetry, Sheldon schemes to ensure she's available.
Sunday, January 4
The Imitation Perturbation
Season 12 • Episode 6
Sheldon seeks retaliation when Wolowitz dresses up as Sheldon for Halloween.
Sunday, January 4
The Grant Allocation Derivation
Season 12 • Episode 7
Leonard struggles when he's given the responsibility of distributing extra grant money.
Sunday, January 4
The Consummation Deviation
Season 12 • Episode 8
Sheldon tries to bond with Amy's father; Wolowitz lures Mr. Fowler away with magic tricks.
Sunday, January 4
The Agreement Dissection
Season 4 • Episode 21
Priya dissects the roommate agreement; the ladies take Sheldon dancing.
Sunday, January 4
The Wildebeest Implementation
Season 4 • Episode 22
Raj tries to cure his social anxiety; Penny spies on Leonard and his girlfriend through Bernadette.
Sunday, January 4
The Engagement Reaction
Season 4 • Episode 23
Howard's mom winds up in the hospital after hearing news of her son's engagement to Bernadette.
Sunday, January 4
The Roommate Transmogrification
Season 4 • Episode 24
Bernadette gets her Ph.D., inspiring the guys to tease Wolowitz about his lack of a doctorate.
Sunday, January 4
The Skank Reflex Analysis
Season 5 • Episode 1
Penny worries that she has ruined her relationship with her friends.
Sunday, January 4
The Infestation Hypothesis
Season 5 • Episode 2
Amy is caught in the middle when Penny and Sheldon argue over a pre-owned chair.
Sunday, January 4
The Pulled Groin Extrapolation
Season 5 • Episode 3
Bernadette, Howard and Mrs. Wolowitz spend the weekend together.
Sunday, January 4
The Wiggly Finger Catalyst
Season 5 • Episode 4
Raj wants a girlfriend, so Penny introduces him to a woman he can communicate with.
Sunday, January 4
The Positive Negative Reaction
Season 9 • Episode 16
The gang celebrates news of Bernadette's pregnancy by singing karaoke.
Sunday, January 4
The Celebration Experimentation
Season 9 • Episode 17
For the first time in nine years, the gang celebrates Sheldon's birthday.
Monday, January 5
The Application Deterioration
Season 9 • Episode 18
The guys file for a patent on their invention; the girls give dating advice to Koothrappali.
Monday, January 5
The Solder Excursion Diversion
Season 9 • Episode 19
Sheldon makes a revelation when Amy buys him a new laptop; Leonard and Wolowitz lie to their wives.
Monday, January 5
The Skank Reflex Analysis
Season 5 • Episode 1
Penny worries that she has ruined her relationship with her friends.
Monday, January 5
The Infestation Hypothesis
Season 5 • Episode 2
Amy is caught in the middle when Penny and Sheldon argue over a pre-owned chair.
Monday, January 5
The Good Guy Fluctuation
Season 5 • Episode 7
An attractive comic book artist tests Leonard and Priya's relationship.
Monday, January 5
The Isolation Permutation
Season 5 • Episode 8
Amy is devastated when Penny and Bernadette shop for wedding dresses without her.
Monday, January 5
The Ornithophobia Diffusion
Season 5 • Episode 9
Leonard and Penny spend time alone; Sheldon tries to face his fear of birds.
Monday, January 5
The Flaming Spittoon Acquisition
Season 5 • Episode 10
Sheldon is jealous when Stuart, from the comic book store, asks Amy out on a date.
Monday, January 5
The Speckerman Recurrence
Season 5 • Episode 11
Leonard must face the bully who targeted him in high school; Penny confronts her past actions.
Monday, January 5
The Shiny Trinket Maneuver
Season 5 • Episode 12
Amy is upset with Sheldon when he isn't impressed with her recent accomplishment.
Monday, January 5
The Recombination Hypothesis
Season 5 • Episode 13
Everything could change when Leonard spontaneously invites Penny to a romantic dinner.
Monday, January 5
The Beta Test Initiation
Season 5 • Episode 14
Penny and Leonard experiment with their new relationship; Raj forms an unusual bond.
Monday, January 5
The Speckerman Recurrence
Season 5 • Episode 11
Leonard must face the bully who targeted him in high school; Penny confronts her past actions.
Monday, January 5
The Collaboration Fluctuation
Season 10 • Episode 19
Leonard, Penny and Raj adjust to their new arrangement; Sheldon expresses interest in Amy's work.
Monday, January 5
The Recombination Hypothesis
Season 5 • Episode 13
Everything could change when Leonard spontaneously invites Penny to a romantic dinner.
Monday, January 5
The Beta Test Initiation
Season 5 • Episode 14
Penny and Leonard experiment with their new relationship; Raj forms an unusual bond.
Monday, January 5
The Friendship Contraction
Season 5 • Episode 15
Leonard starts to reconsider his friendship with Sheldon; Wolowitz tries to choose a nickname.
Monday, January 5
The Vacation Solution
Season 5 • Episode 16
When Sheldon is forced to take a vacation, he goes to work with Amy in her neurobiology lab.
Monday, January 5
The Rothman Disintegration
Season 5 • Episode 17
Sheldon and Kripke compete for a corner office; Penny receives a gift from Amy.
Monday, January 5
The Werewolf Transformation
Season 5 • Episode 18
Sheldon's routine is turned upside down when his barber gets sick.
Monday, January 5
The Weekend Vortex
Season 5 • Episode 19
Sheldon chooses to participate in a guys-only weekend gaming marathon rather than joining Amy.
Monday, January 5
The Transporter Malfunction
Season 5 • Episode 20
After receiving new "Star Trek" collectibles, Sheldon finds himself haunted by Mr. Spock.
Tuesday, January 6
The Conjugal Conjecture
Season 10 • Episode 1
The group deals with the aftermath of Sheldon's mother and Leonard's father's evening together.
Tuesday, January 6
The Killer Robot Instability
Season 2 • Episode 12
The guys lose their most important teammate in an upcoming fighting-robot competition.
Tuesday, January 6
The Hawking Excitation
Season 5 • Episode 21
When Wolowitz works with Stephen Hawking, Sheldon is determined to meet the famous scientist.
Tuesday, January 6
The Stag Convergence
Season 5 • Episode 22
Knowledge of Howard's sexual history makes Bernadette reconsider their future together.
Tuesday, January 6
The Launch Acceleration
Season 5 • Episode 23
Wedding plans are jeopardized when NASA reschedules Howard's mission; Leonard surprises Penny.
Tuesday, January 6
The Countdown Reflection
Season 5 • Episode 24
The gang tries to help Wolowitz and Bernadette get married before the space launch.
Tuesday, January 6
The Date Night Variable
Season 6 • Episode 1
Raj faces his loneliness; Wolowitz gets drawn into a fight between Bernadette and his mom.
Tuesday, January 6
The Decoupling Fluctuation
Season 6 • Episode 2
Sheldon tries to intervene when he learns that Penny is thinking about breaking up with Leonard.
Tuesday, January 6
The Higgs Boson Observation
Season 6 • Episode 3
Amy feels threatened by Sheldon's new assistant; space starts to wear on Wolowitz.
Tuesday, January 6
The Recollection Dissipation
Season 10 • Episode 20
Sheldon collaborates on too many projects; Bernadette nears the end of her maternity leave.
Tuesday, January 6
The Holographic Excitation
Season 6 • Episode 5
The gang heads to Stuart's comic book store to celebrate Halloween.
Tuesday, January 6
The Extract Obliteration
Season 6 • Episode 6
A game threatens Sheldon's relationship with Stephen Hawking; Penny signs up for a college class.
Tuesday, January 6
The Habitation Configuration
Season 6 • Episode 7
Sheldon is caught in the middle of Amy and Wil Wheaton's argument.
Tuesday, January 6
The 43 Peculiarity
Season 6 • Episode 8
Raj and Howard try to figure out why Sheldon disappears at 2:45 every afternoon.
Tuesday, January 6
The Parking Spot Escalation
Season 6 • Episode 9
Sheldon and Wolowitz's fight over a parking spot at the university impacts the whole gang.
Tuesday, January 6
The Fish Guts Displacement
Season 6 • Episode 10
When Amy gets sick, Sheldon tries to nurse her back to health.
Tuesday, January 6
The Santa Simulation
Season 6 • Episode 11
During a game, Sheldon revisits Christmas memories; finding a date for Koothrappali.
Tuesday, January 6
The Egg Salad Equivalency
Season 6 • Episode 12
Sheldon is accused of sexual harassment and winds up getting Raj, Leonard and Wolowitz in trouble.
Wednesday, January 7
The Fetal Kick Catalyst
Season 10 • Episode 6
At a Comic Con event, Penny learns there are fans of her performance in "Serial Ape-ist."
Wednesday, January 7
The Friendship Algorithm
Season 2 • Episode 13
Sheldon develops a scientific procedure for making friends; Kripke controls a new supercomputer.
Wednesday, January 7
The Bakersfield Expedition
Season 6 • Episode 13
The guys don costumes and go on a road trip to a comic book convention.
Wednesday, January 7
The Cooper/Kripke Inversion
Season 6 • Episode 14
Sheldon faces a crisis of confidence when he is forced to work with his nemesis, Barry Kripke.
Wednesday, January 7
The Spoiler Alert Segmentation
Season 6 • Episode 15
A fight between Sheldon and Leonard impacts Amy and Penny's living arrangements.
Wednesday, January 7
The Tangible Affection Proof
Season 6 • Episode 16
The guys search for Valentine's Day gifts; Stuart and Raj host a "lonely people" party.
Wednesday, January 7
The Monster Isolation
Season 6 • Episode 17
Koothrappali decides to never leave his apartment; Penny's acting skills impress Sheldon.
Wednesday, January 7
The Contractual Obligation Implementation
Season 6 • Episode 18
Leonard, Sheldon and Wolowitz talk to junior high girls about science-related careers.
Wednesday, January 7
The Closet Reconfiguration
Season 6 • Episode 19
Howard considers whether or not he should open a letter from his father.
Wednesday, January 7
The Separation Agitation
Season 10 • Episode 21
Howard and Bernadette struggle to leave Halley in day care; Bert introduces his new girlfriend.
Wednesday, January 7
The Veracity Elasticity
Season 10 • Episode 7
Amy lies about repairs being made to her apartment so she can continue living with Sheldon.
Wednesday, January 7
The Brain Bowl Incubation
Season 10 • Episode 8
After a successful gene experiment, Sheldon is determined to convince Amy they should procreate.
Wednesday, January 7
The Geology Elevation
Season 10 • Episode 9
Sheldon gets jealous when a co-worker wins an award; Wolowitz finds an old invention.
Wednesday, January 7
The Property Division Collision
Season 10 • Episode 10
Sheldon and Leonard divvy up their shared belongings.
Thursday, January 8
The Birthday Synchronicity
Season 10 • Episode 11
Bernadette and Howard welcome their baby; Amy celebrates her birthday with Sheldon.
Thursday, January 8
The Financial Permeability
Season 2 • Episode 14
Sheldon's solution to Penny's financial difficulty leads to a confrontation.
Thursday, January 8
The Closure Alternative
Season 6 • Episode 21
Amy tries to help Sheldon get over his need for closure; Raj discovers a secret about Lucy.
Thursday, January 8
The Proton Resurgence
Season 6 • Episode 22
Leonard and Sheldon hire the host of their favorite childhood TV show to perform.
Thursday, January 8
The Love Spell Potential
Season 6 • Episode 23
Amy and Sheldon's relationship takes a surprising turn during a game of "Dungeons & Dragons."
Thursday, January 8
The Bon Voyage Reaction
Season 6 • Episode 24
When Leonard receives an opportunity to work overseas, Penny and Sheldon are thrown for a loop.
Thursday, January 8
The Hofstadter Insufficiency
Season 7 • Episode 1
Sheldon and Penny share secrets while Leonard is away; Wolowitz helps Raj get over his ex.
Thursday, January 8
The Deception Verification
Season 7 • Episode 2
Leonard and Sheldon's friendship is tested; Wolowitz's masculinity is threatened.
Thursday, January 8
The Scavenger Vortex
Season 7 • Episode 3
Raj designs a scavenger hunt that brings out the best -- and the worst -- in the whole gang.
Thursday, January 8
The Cognition Regeneration
Season 10 • Episode 22
Leonard has concerns when Penny considers accepting a job offer from Zack, her ex-boyfriend.
Thursday, January 8
The Workplace Proximity
Season 7 • Episode 5
Sheldon and Amy's relationship is tested when she takes a job at his university.
Thursday, January 8
The Romance Resonance
Season 7 • Episode 6
Sheldon's latest scientific breakthrough leaves him feeling like a fraud.
Thursday, January 8
The Proton Displacement
Season 7 • Episode 7
When Professor Proton asks Leonard for help with an experiment, Sheldon befriends Proton's rival.
Thursday, January 8
The Itchy Brain Simulation
Season 7 • Episode 8
When a mistake comes to light, Sheldon punishes Leonard; Penny decides to confront Raj's ex.
Thursday, January 8
The Thanksgiving Decoupling
Season 7 • Episode 9
When the gang decides to spend Thanksgiving at Mrs. Wolowitz's house, Sheldon protests.
Thursday, January 8
The Discovery Dissipation
Season 7 • Episode 10
Amy and Leonard try to help Sheldon deal with his shame; Raj stays with Bernadette and Howard.
Thursday, January 8
The Locomotion Reverberation
Season 10 • Episode 15
Leonard and Wolowitz try to distract Sheldon when he slows the progress of their guidance system.
Thursday, January 8
The Allowance Evaporation
Season 10 • Episode 16
Sheldon and Amy have a fight; Koothrappali stops receiving financial support from his father.
Friday, January 9
The Comic-Con Conundrum
Season 10 • Episode 17
Koothrappali asks Sheldon to help him get out of debt; Penny considers joining Leonard at Comic-Con.
Friday, January 9
The Maternal Capacitance
Season 2 • Episode 15
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
Friday, January 9
The Friendship Contraction
Season 5 • Episode 15
Leonard starts to reconsider his friendship with Sheldon; Wolowitz tries to choose a nickname.
Friday, January 9
The Vacation Solution
Season 5 • Episode 16
When Sheldon is forced to take a vacation, he goes to work with Amy in her neurobiology lab.
Friday, January 9
The Rothman Disintegration
Season 5 • Episode 17
Sheldon and Kripke compete for a corner office; Penny receives a gift from Amy.
Friday, January 9
The Werewolf Transformation
Season 5 • Episode 18
Sheldon's routine is turned upside down when his barber gets sick.
Friday, January 9
The Weekend Vortex
Season 5 • Episode 19
Sheldon chooses to participate in a guys-only weekend gaming marathon rather than joining Amy.
Friday, January 9
The Transporter Malfunction
Season 5 • Episode 20
After receiving new "Star Trek" collectibles, Sheldon finds himself haunted by Mr. Spock.
Friday, January 9
The Hawking Excitation
Season 5 • Episode 21
When Wolowitz works with Stephen Hawking, Sheldon is determined to meet the famous scientist.
Friday, January 9
The Stag Convergence
Season 5 • Episode 22
Knowledge of Howard's sexual history makes Bernadette reconsider their future together.
Friday, January 9
The Launch Acceleration
Season 5 • Episode 23
Wedding plans are jeopardized when NASA reschedules Howard's mission; Leonard surprises Penny.
Friday, January 9
The Countdown Reflection
Season 5 • Episode 24
The gang tries to help Wolowitz and Bernadette get married before the space launch.
Friday, January 9
The Table Polarization
Season 7 • Episode 16
When Leonard buys a dining room table, Sheldon re-evaluates the changes in his life.
Friday, January 9
The Friendship Turbulence
Season 7 • Episode 17
Bernadette tries to negotiate peace between Sheldon and Wolowitz.
Friday, January 9
The Gyroscopic Collapse
Season 10 • Episode 23
Leonard, Sheldon and Wolowitz get an unwelcome surprise after completing the Air Force project.
Friday, January 9
The Escape Hatch Identification
Season 10 • Episode 18
Leonard and Penny offer Sheldon's old room to Raj after he moves out of his apartment.
Friday, January 9
The Collaboration Fluctuation
Season 10 • Episode 19
Leonard, Penny and Raj adjust to their new arrangement; Sheldon expresses interest in Amy's work.
Friday, January 9
The Recollection Dissipation
Season 10 • Episode 20
Sheldon collaborates on too many projects; Bernadette nears the end of her maternity leave.
Friday, January 9
The Separation Agitation
Season 10 • Episode 21
Howard and Bernadette struggle to leave Halley in day care; Bert introduces his new girlfriend.
Saturday, January 10
The Cognition Regeneration
Season 10 • Episode 22
Leonard has concerns when Penny considers accepting a job offer from Zack, her ex-boyfriend.
Saturday, January 10
The Terminator Decoupling
Season 2 • Episode 17
Leonard, Sheldon and Wolowitz are ecstatic to learn that a sci-fi actress is aboard their train.
Saturday, January 10
The Citation Negation
Season 12 • Episode 9
Sheldon and Amy are devastated after learning that Super Asymmetry has already been disproved.
Saturday, January 10
The VCR Illumination
Season 12 • Episode 10
A VHS tape from Sheldon's past inspires him not to give up; Bernadette tries to help Wolowitz.
Saturday, January 10
The Paintball Scattering
Season 12 • Episode 11
Penny and Leonard organize a paintball game, which results in mayhem due to Sheldon's jealousy.
Saturday, January 10
The Propagation Proposition
Season 12 • Episode 12
Penny's ex-boyfriend Zack learns that he is infertile, so he asks Leonard for help.
Saturday, January 10
The Confirmation Polarization
Season 12 • Episode 13
A rival team of physicists tries to take credit for Amy and Sheldon's super asymmetry theory.
Saturday, January 10
The Meteorite Manifestation
Season 12 • Episode 14
Leonard is disappointed when his friends exclude him from a scientific project.
Saturday, January 10
The Donation Oscillation
Season 12 • Episode 15
Penny tries to throw a wrench into Leonard's plan to be a sperm donor for her ex-boyfriend.
Saturday, January 10
The D & D Vortex
Season 12 • Episode 16
The gang fights for the one open seat at Wil Wheaton's celebrity Dungeons and Dragons game.
Saturday, January 10
The Conference Valuation
Season 12 • Episode 17
When Penny and Bernadette go to a convention, Wolowitz is left in charge of the kids.
Saturday, January 10
The Laureate Accumulation
Season 12 • Episode 18
Sheldon and Amy try to win over Nobel laureates Kip Thorne, George Smoot and Frances Arnold.
Saturday, January 10
The Inspiration Deprivation
Season 12 • Episode 19
Wolowitz buys a scooter that looks like the one he had years ago.
Saturday, January 10
The Decision Reverberation
Season 12 • Episode 20
Koothrappali publishes a paper that suggests he may have discovered alien life.
Saturday, January 10
The Gyroscopic Collapse
Season 10 • Episode 23
Leonard, Sheldon and Wolowitz get an unwelcome surprise after completing the Air Force project.
Saturday, January 10
The Long Distance Dissonance
Season 10 • Episode 24
Sheldon's former admirer, Dr. Ramona Nowitzki, resurfaces while Amy is away at Princeton.
Saturday, January 10
The Proposal Proposal
Season 11 • Episode 1
Amy answers Sheldon's marriage proposal; Howard and Bernadette struggle with unexpected news.
Saturday, January 10
The Retraction Reaction
Season 11 • Episode 2
Leonard's job is at stake after he gives an embarrassing radio interview; Amy and Bernadette bond.
Sunday, January 11
The Relaxation Integration
Season 11 • Episode 3
As Sheldon stresses about picking a wedding date, Amy tells him he can be more easygoing.
Sunday, January 11
The Plagiarism Schism
Season 12 • Episode 21
Kripke has proof that Dr. Pemberton plagiarized his thesis in college.
Sunday, January 11
The Maternal Conclusion
Season 12 • Episode 22
Leonard is pleasantly surprised when Beverly comes to visit and she's genuinely kind to him.
Sunday, January 11
The Change Constant
Season 12 • Episode 23
Sheldon and Amy await big news.
Sunday, January 11
The Stockholm Syndrome
Season 12 • Episode 24
Bernadette and Wolowitz leave their kids for the first time; Penny and Leonard try to keep a secret.
Sunday, January 11
Pilot
Season 1 • Episode 1
Leonard likes new neighbor Penny, but his roommate thinks he is chasing an impossible dream.
Sunday, January 11
The Big Bran Hypothesis
Season 1 • Episode 2
Leonard volunteers to sign for a package, hoping to make a good impression on Penny.
Sunday, January 11
The Fuzzy Boots Corollary
Season 1 • Episode 3
Unhappy that Penny is seeing someone, Leonard summons the courage to ask another woman out.
Sunday, January 11
The Luminous Fish Effect
Season 1 • Episode 4
Getting fired gives Sheldon the opportunity to explore life beyond physics.
Sunday, January 11
The Hamburger Postulate
Season 1 • Episode 5
Leonard, trying to get over Penny, has an unexpected encounter with a fellow scientist.
Sunday, January 11
The Middle Earth Paradigm
Season 1 • Episode 6
Leonard, Sheldon, Wolowitz and Koothrappali attend Penny's Halloween party.
Sunday, January 11
The Dumpling Paradox
Season 1 • Episode 7
Penny sleeps on Leonard and Sheldon's couch when Wolowitz takes over her apartment.
Sunday, January 11
The Grasshopper Experiment
Season 1 • Episode 8
On a blind date, Koothrappali discovers that he can talk to the opposite sex after a few drinks.
Sunday, January 11
The Indecision Amalgamation
Season 7 • Episode 19
Raj struggles with guilt when he dates two women at once; Penny has a chance to be in a movie.
Sunday, January 11
The Relationship Diremption
Season 7 • Episode 20
Sheldon has a personal crisis when he decides string theory is a waste of his time.
Sunday, January 11
The Anything Can Happen Recurrence
Season 7 • Episode 21
Sheldon gives spontaneity a try; Raj asks Howard for help with preparation for a date with Emily.
Sunday, January 11
The Proton Transmogrification
Season 7 • Episode 22
Professor Proton helps Sheldon deal with grief; Leonard gets into a competition with Penny.
Sunday, January 11
The Gorilla Dissolution
Season 7 • Episode 23
A bad day compels Penny to re-evaluate her choices -- including Leonard.
Sunday, January 11
The Status Quo Combustion
Season 7 • Episode 24
Faced with an uncertain future, Sheldon considers a major change.
Sunday, January 11
The Proton Regeneration
Season 11 • Episode 6
Sheldon auditions for the role of the new Professor Proton; Penny takes care of Halley.
Sunday, January 11
The Geology Methodology
Season 11 • Episode 7
Sheldon tries to keep his collaboration with Bert a secret; Penny and Bernadette coach Koothrappali.
Monday, January 12
The Tesla Recoil
Season 11 • Episode 8
Leonard and Wolowitz are furious to learn Sheldon worked with the military behind their backs.
Monday, January 12
The Scavenger Vortex
Season 7 • Episode 3
Raj designs a scavenger hunt that brings out the best -- and the worst -- in the whole gang.
Monday, January 12
The Raiders Minimization
Season 7 • Episode 4
Sheldon wants revenge after Amy ruins one of his favorite films.
Monday, January 12
The Date Night Variable
Season 6 • Episode 1
Raj faces his loneliness; Wolowitz gets drawn into a fight between Bernadette and his mom.
Monday, January 12
The Decoupling Fluctuation
Season 6 • Episode 2
Sheldon tries to intervene when he learns that Penny is thinking about breaking up with Leonard.
Monday, January 12
The Higgs Boson Observation
Season 6 • Episode 3
Amy feels threatened by Sheldon's new assistant; space starts to wear on Wolowitz.
Monday, January 12
The Re-Entry Minimization
Season 6 • Episode 4
Wolowitz's return from space isn't all he expected; game night becomes a gender war.
Monday, January 12
The Holographic Excitation
Season 6 • Episode 5
The gang heads to Stuart's comic book store to celebrate Halloween.
Monday, January 12
The Extract Obliteration
Season 6 • Episode 6
A game threatens Sheldon's relationship with Stephen Hawking; Penny signs up for a college class.
Monday, January 12
The Habitation Configuration
Season 6 • Episode 7
Sheldon is caught in the middle of Amy and Wil Wheaton's argument.
Monday, January 12
The 43 Peculiarity
Season 6 • Episode 8
Raj and Howard try to figure out why Sheldon disappears at 2:45 every afternoon.
Monday, January 12
The Confidence Erosion
Season 11 • Episode 10
Sheldon and Amy try to use math to eliminate wedding planning stress.
Monday, January 12
The Long Distance Dissonance
Season 10 • Episode 24
Sheldon's former admirer, Dr. Ramona Nowitzki, resurfaces while Amy is away at Princeton.
Monday, January 12
The Conjugal Configuration
Season 12 • Episode 1
Penny and Leonard discover they are uncomfortably similar to Amy's parents.
Monday, January 12
The Wedding Gift Wormhole
Season 12 • Episode 2
Sheldon and Amy go crazy trying to figure out what Leonard and Penny gave them for their wedding.
Monday, January 12
The Procreation Calculation
Season 12 • Episode 3
Stuart starts bringing his new girlfriend home; Koothrappali explores an arranged marriage.
Monday, January 12
The Tam Turbulence
Season 12 • Episode 4
Sheldon won't tell anyone why he's never mentioned Tam, his childhood best friend.
Monday, January 12
The Locomotion Interruption
Season 8 • Episode 1
Leonard and Amy make an unexpected trip to Arizona to fetch Sheldon; Penny goes for an interview.
Monday, January 12
The Junior Professor Solution
Season 8 • Episode 2
Amy takes advantage of the tension between Penny and Bernadette.
Monday, January 12
The First Pitch Insufficiency
Season 8 • Episode 3
Wolowitz feels nervous when he is asked to throw the first pitch at a Los Angeles Angels game.
Monday, January 12
The Hook-Up Reverberation
Season 8 • Episode 4
Raj's honesty comes back to haunt him when his new girlfriend is unfriendly to Penny.
Tuesday, January 13
The Separation Triangulation
Season 11 • Episode 14
Koothrappali learns the woman he's dating has a very upset husband; Sheldon rents his old room.
Tuesday, January 13
The Work Song Nanocluster
Season 2 • Episode 18
Penny's home business turns into a complete nightmare when Sheldon takes over.
Tuesday, January 13
The Focus Attenuation
Season 8 • Episode 5
During their weekend in Las Vegas, Bernadette and Amy accuse Penny of being a buzz kill.
Tuesday, January 13
The Expedition Approximation
Season 8 • Episode 6
Raj and Sheldon try to simulate a dark-matter research expedition; Penny and Leonard have a fight.
Tuesday, January 13
The Misinterpretation Agitation
Season 8 • Episode 7
The guys try to help when Penny is faced with an awkward dilemma at work.
Tuesday, January 13
The Prom Equivalency
Season 8 • Episode 8
Sheldon feels pressured to participate in traditions when the gang re-creates a high-school prom.
Tuesday, January 13
The Septum Deviation
Season 8 • Episode 9
Leonard has minor surgery on his nose, causing Sheldon to overreact.
Tuesday, January 13
The Champagne Reflection
Season 8 • Episode 10
Howard, Leonard and Raj look through their dead professor's research.
Tuesday, January 13
The Clean Room Infiltration
Season 8 • Episode 11
Leonard and Wolowitz clash over a work emergency; Sheldon resents having to celebrate the holidays.
Tuesday, January 13
The Proposal Proposal
Season 11 • Episode 1
Amy answers Sheldon's marriage proposal; Howard and Bernadette struggle with unexpected news.
Tuesday, January 13
The Anxiety Optimization
Season 8 • Episode 13
Sheldon asks his friends to challenge him in hope of achieving a scientific breakthrough.
Tuesday, January 13
The Troll Manifestation
Season 8 • Episode 14
Sheldon and Leonard must defend themselves from an online bully's criticism after writing a paper.
Tuesday, January 13
The Comic Book Store Regeneration
Season 8 • Episode 15
The gang waits for the reopening of the comic book store; Wolowitz gets some shocking news.
Tuesday, January 13
The Intimacy Acceleration
Season 8 • Episode 16
Penny and Sheldon design an experiment -- as a joke -- to make participants fall in love.
Tuesday, January 13
The Colonization Application
Season 8 • Episode 17
Amy finds out that Sheldon applied for a one-way mission to colonize Mars.
Tuesday, January 13
The Leftover Thermalization
Season 8 • Episode 18
A magazine article only credits Sheldon in an article about a paper he co-wrote with Leonard.
Tuesday, January 13
The Skywalker Incursion
Season 8 • Episode 19
While on their way to UC Berkeley, Sheldon and Leonard take a detour in hope of meeting an idol.
Tuesday, January 13
The Fortification Implementation
Season 8 • Episode 20
Sheldon and Amy build a blanket fort; Wolowitz meets a half-brother he didn't know he had.
Wednesday, January 14
The Tenant Disassociation
Season 11 • Episode 19
Leonard decides to run against Sheldon for president of the tenants association.
Wednesday, January 14
The Dead Hooker Juxtaposition
Season 2 • Episode 19
Penny has a rivalry with a new neighbor who threatens her position as queen bee of the building.
Wednesday, January 14
The Communication Deterioration
Season 8 • Episode 21
The guys fight over a message that could be used for alien contact.
Wednesday, January 14
The Graduation Transmission
Season 8 • Episode 22
Wolowitz questions his engineering skills; a canceled flight puts Leonard's plans in jeopardy.
Wednesday, January 14
The Maternal Combustion
Season 8 • Episode 23
When Sheldon's and Leonard's mothers finally meet, personalities collide.
Wednesday, January 14
The Commitment Determination
Season 8 • Episode 24
While facing relationship changes, Sheldon pushes Penny and Leonard to choose a wedding date.
Wednesday, January 14
The Matrimonial Momentum
Season 9 • Episode 1
Penny must decide if she can get past Leonard's bad behavior.
Wednesday, January 14
The Separation Oscillation
Season 9 • Episode 2
Leonard tries to ease Penny's mind; Sheldon plans a special episode of "Fun With Flags."
Wednesday, January 14
The Bachelor Party Corrosion
Season 9 • Episode 3
A flat tire during Leonard's bachelor party weekend in Mexico tests the guys' skills.
Wednesday, January 14
The Retraction Reaction
Season 11 • Episode 2
Leonard's job is at stake after he gives an embarrassing radio interview; Amy and Bernadette bond.
Wednesday, January 14
The Reclusive Potential
Season 11 • Episode 20
A brilliant but reclusive scientist invites Sheldon to his cabin in the middle of nowhere.
Wednesday, January 14
The Comet Polarization
Season 11 • Episode 21
Friendships are threatened when Koothrappali takes credit for Penny's astronomical discovery.
Wednesday, January 14
The Monetary Insufficiency
Season 11 • Episode 22
Sheldon tries to win money for science; Penny and Bernadette take Amy wedding dress shopping.
Wednesday, January 14
The Sibling Realignment
Season 11 • Episode 23
Sheldon's mother won't attend his wedding unless he invites his brother.
Thursday, January 15
The Bow Tie Asymmetry
Season 11 • Episode 24
Amy's parents and Sheldon's family arrive; nearly everybody is focused on the wedding plans.
Thursday, January 15
The Hofstadter Isotope
Season 2 • Episode 20
Wolowitz and Leonard decide to check out a local bar on Ladies' Night.
Thursday, January 15
The Perspiration Implementation
Season 9 • Episode 5
Barry Kripke expresses interest in Amy while leading a fencing lesson for the guys.
Thursday, January 15
The Helium Insufficiency
Season 9 • Episode 6
Leonard and Sheldon try to secure the helium they need during a nation-wide shortage.
Thursday, January 15
The Spock Resonance
Season 9 • Episode 7
Sheldon struggles to keep his emotions in check when he is interviewed for a documentary.
Thursday, January 15
The Mystery Date Observation
Season 9 • Episode 8
Sheldon, Wolowitz and Koothrappali post an ad online to find a new girlfriend for Sheldon.
Thursday, January 15
The Platonic Permutation
Season 9 • Episode 9
Amy and Sheldon spend Thanksgiving at the aquarium -- as friends.
Thursday, January 15
The Earworm Reverberation
Season 9 • Episode 10
Sheldon has a song stuck in his head; despite their awkward date, Amy asks Dave over for dinner.
Thursday, January 15
The Opening Night Excitation
Season 9 • Episode 11
After dating for more than five years, Amy and Sheldon spend the night together for the first time.
Thursday, January 15
The Relaxation Integration
Season 11 • Episode 3
As Sheldon stresses about picking a wedding date, Amy tells him he can be more easygoing.
Thursday, January 15
The Empathy Optimization
Season 9 • Episode 13
Leonard, Penny and the gang attempt to treat themselves to a Sheldon-free weekend.
Thursday, January 15
The Meemaw Materialization
Season 9 • Episode 14
Sheldon's excitement about his Meemaw's visit fades when she butts heads with Amy.
Thursday, January 15
The Valentino Submergence
Season 9 • Episode 15
Amy and Sheldon host a Valentine's Day edition of Fun With Flags; Raj is torn between two women.
Thursday, January 15
The Positive Negative Reaction
Season 9 • Episode 16
The gang celebrates news of Bernadette's pregnancy by singing karaoke.
Thursday, January 15
The Conjugal Configuration
Season 12 • Episode 1
Penny and Leonard discover they are uncomfortably similar to Amy's parents.
Thursday, January 15
The Wedding Gift Wormhole
Season 12 • Episode 2
Sheldon and Amy go crazy trying to figure out what Leonard and Penny gave them for their wedding.
Thursday, January 15
The Celebration Experimentation
Season 9 • Episode 17
For the first time in nine years, the gang celebrates Sheldon's birthday.
Thursday, January 15
The Application Deterioration
Season 9 • Episode 18
The guys file for a patent on their invention; the girls give dating advice to Koothrappali.
Friday, January 16
The Planetarium Collision
Season 12 • Episode 5
When Amy doesn't have time to work on super-asymmetry, Sheldon schemes to ensure she's available.
Friday, January 16
The Vegas Renormalization
Season 2 • Episode 21
Koothrappali and Leonard take Wolowitz to Las Vegas; Sheldon gets locked out of his apartment.
Friday, January 16
The Parking Spot Escalation
Season 6 • Episode 9
Sheldon and Wolowitz's fight over a parking spot at the university impacts the whole gang.
Friday, January 16
The Fish Guts Displacement
Season 6 • Episode 10
When Amy gets sick, Sheldon tries to nurse her back to health.
Friday, January 16
The Santa Simulation
Season 6 • Episode 11
During a game, Sheldon revisits Christmas memories; finding a date for Koothrappali.
Friday, January 16
The Egg Salad Equivalency
Season 6 • Episode 12
Sheldon is accused of sexual harassment and winds up getting Raj, Leonard and Wolowitz in trouble.
Friday, January 16
The Bakersfield Expedition
Season 6 • Episode 13
The guys don costumes and go on a road trip to a comic book convention.
Friday, January 16
The Cooper/Kripke Inversion
Season 6 • Episode 14
Sheldon faces a crisis of confidence when he is forced to work with his nemesis, Barry Kripke.
Friday, January 16
The Spoiler Alert Segmentation
Season 6 • Episode 15
A fight between Sheldon and Leonard impacts Amy and Penny's living arrangements.
Friday, January 16
The Tangible Affection Proof
Season 6 • Episode 16
The guys search for Valentine's Day gifts; Stuart and Raj host a "lonely people" party.
Friday, January 16
The Monster Isolation
Season 6 • Episode 17
Koothrappali decides to never leave his apartment; Penny's acting skills impress Sheldon.
Friday, January 16
The Contractual Obligation Implementation
Season 6 • Episode 18
Leonard, Sheldon and Wolowitz talk to junior high girls about science-related careers.
Friday, January 16
The Convergence Convergence
Season 9 • Episode 24
Leonard's recently divorced parents and Sheldon's devoutly religious mother visit.
Friday, January 16
The Conjugal Conjecture
Season 10 • Episode 1
The group deals with the aftermath of Sheldon's mother and Leonard's father's evening together.
Friday, January 16
The Explosion Implosion
Season 11 • Episode 4
Wolowitz and Sheldon bond over having disappointing fathers; Leonard's mother befriends Penny.
Friday, January 16
The Grant Allocation Derivation
Season 12 • Episode 7
Leonard struggles when he's given the responsibility of distributing extra grant money.
Friday, January 16
The Consummation Deviation
Season 12 • Episode 8
Sheldon tries to bond with Amy's father; Wolowitz lures Mr. Fowler away with magic tricks.
Friday, January 16
The Citation Negation
Season 12 • Episode 9
Sheldon and Amy are devastated after learning that Super Asymmetry has already been disproved.
Friday, January 16
The VCR Illumination
Season 12 • Episode 10
A VHS tape from Sheldon's past inspires him not to give up; Bernadette tries to help Wolowitz.
Saturday, January 17
The Paintball Scattering
Season 12 • Episode 11
Penny and Leonard organize a paintball game, which results in mayhem due to Sheldon's jealousy.
Saturday, January 17
The Classified Materials Turbulence
Season 2 • Episode 22
Penny makes a surprising revelation about Leonard while on her date with Stuart.
Saturday, January 17
The Cooper-Hofstadter Polarization
Season 1 • Episode 9
Penny tries to mediate when Sheldon and Leonard disagree about a physics conference.
Saturday, January 17
The Loobenfeld Decay
Season 1 • Episode 10
Leonard and Sheldon try to avoid seeing Penny perform after hearing her sing.
Saturday, January 17
The Pancake Batter Anomaly
Season 1 • Episode 11
Leonard and the boys avoid Sheldon when he gets sick, leaving Penny to nurse him back to health.
Saturday, January 17
The Jerusalem Duality
Season 1 • Episode 12
Sheldon and Leonard look for a way to derail a 15-year-old physics prodigy's research.
Saturday, January 17
The Bat Jar Conjecture
Season 1 • Episode 13
The guys kick Sheldon off the Physics Bowl team and bring his nemesis aboard.
Saturday, January 17
The Nerdvana Annihilation
Season 1 • Episode 14
Penny tells the guys their obsession with comics and toys is pathetic.
Saturday, January 17
The Pork Chop Indeterminacy
Season 1 • Episode 15
Leonard, Wolowitz and Koothrappali fall for Sheldon's twin sister.
Saturday, January 17
The Peanut Reaction
Season 1 • Episode 16
Penny learns that Leonard does not celebrate birthdays, so she plans a surprise party.
Saturday, January 17
The Tangerine Factor
Season 1 • Episode 17
Leonard finally works up the courage to ask Penny out on a date, and both ask Sheldon for advice.
Saturday, January 17
The Bad Fish Paradigm
Season 2 • Episode 1
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
Saturday, January 17
The Codpiece Topology
Season 2 • Episode 2
Leonard rushes into a rebound relationship with Sheldon's nemesis.
Saturday, January 17
The Barbarian Sublimation
Season 2 • Episode 3
Sheldon creates a monster when he introduces Penny to online gaming.
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