The Big Bang Theory

Thursday, January 29

The Cornhusker Vortex

Season 3 • Episode 6

Sheldon teaches Leonard about football; kite-fighting threatens Howard and Raj's friendship.

Thursday, January 29

The Separation Triangulation

Season 11 • Episode 14

Koothrappali learns the woman he's dating has a very upset husband; Sheldon rents his old room.

Thursday, January 29

The Vengeance Formulation

Season 3 • Episode 9

After being humiliated on the radio, Sheldon vows to destroy Kripke.

Thursday, January 29

The Gorilla Experiment

Season 3 • Episode 10

Sheldon tries to help Penny understand Leonard's work; Wolowitz gets jealous.

Thursday, January 29

The Maternal Congruence

Season 3 • Episode 11

Leonard is horrified when his mother (Christine Baranski) visits.

Thursday, January 29

The Psychic Vortex

Season 3 • Episode 12

Sheldon and Koothrappali attend a mixer; Leonard discovers that Penny believes in psychics.

Thursday, January 29

The Gorilla Experiment

Season 3 • Episode 10

Sheldon tries to help Penny understand Leonard's work; Wolowitz gets jealous.

Thursday, January 29

The Psychic Vortex

Season 3 • Episode 12

Sheldon and Koothrappali attend a mixer; Leonard discovers that Penny believes in psychics.

Thursday, January 29

The Bozeman Reaction

Season 3 • Episode 13

Leonard and Sheldon turn to their friends to create a state-of-the-art security system.

Thursday, January 29

The Einstein Approximation

Season 3 • Episode 14

Sheldon tries to figure out the answer to a physics problem by working with Penny.

Friday, January 30

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.

Friday, January 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.

Friday, January 30

The Hook-Up Reverberation

Season 8 • Episode 4

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

Friday, January 30

The Focus Attenuation

Season 8 • Episode 5

During their weekend in Las Vegas, Bernadette and Amy accuse Penny of being a buzz kill.

Friday, January 30

The Expedition Approximation

Season 8 • Episode 6

Raj and Sheldon try to simulate a dark-matter research expedition; Penny and Leonard have a fight.

Friday, January 30

The Misinterpretation Agitation

Season 8 • Episode 7

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

Friday, January 30

The Prom Equivalency

Season 8 • Episode 8

Sheldon feels pressured to participate in traditions when the gang re-creates a high-school prom.

Friday, January 30

The Septum Deviation

Season 8 • Episode 9

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

Friday, January 30

The Champagne Reflection

Season 8 • Episode 10

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

Friday, January 30

The Clean Room Infiltration

Season 8 • Episode 11

Leonard and Wolowitz clash over a work emergency; Sheldon resents having to celebrate the holidays.

Friday, January 30

The Pants Alternative

Season 3 • Episode 18

Sheldon's stage fright stands between him and a coveted award.

Friday, January 30

The Wheaton Recurrence

Season 3 • Episode 19

Penny and Leonard have a fight that threatens their relationship; Sheldon and Wil Wheaton face off.

Friday, January 30

The Novelization Correlation

Season 11 • Episode 15

Sheldon petitions Wil Wheaton to appear on his show, but Wil offers a role to Amy instead.

Friday, January 30

The Excelsior Acquisition

Season 3 • Episode 16

Sheldon ends up in traffic court after getting a ticket because of Penny.

Friday, January 30

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.

Friday, January 30

The Pants Alternative

Season 3 • Episode 18

Sheldon's stage fright stands between him and a coveted award.

Friday, January 30

The Wheaton Recurrence

Season 3 • Episode 19

Penny and Leonard have a fight that threatens their relationship; Sheldon and Wil Wheaton face off.

Saturday, January 31

The Spaghetti Catalyst

Season 3 • Episode 20

Sheldon goes to extremes to keep Leonard and Penny happy when they stop speaking to each other.

Saturday, January 31

The Vengeance Formulation

Season 3 • Episode 9

After being humiliated on the radio, Sheldon vows to destroy Kripke.

Saturday, January 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.

Saturday, January 31

The Pants Alternative

Season 3 • Episode 18

Sheldon's stage fright stands between him and a coveted award.

Saturday, January 31

The Wheaton Recurrence

Season 3 • Episode 19

Penny and Leonard have a fight that threatens their relationship; Sheldon and Wil Wheaton face off.

Saturday, January 31

The Spaghetti Catalyst

Season 3 • Episode 20

Sheldon goes to extremes to keep Leonard and Penny happy when they stop speaking to each other.

Saturday, January 31

The Plimpton Stimulation

Season 3 • Episode 21

Sheldon invites a famous physicist to the apartment, and competes with Leonard for her attention.

Saturday, January 31

The Staircase Implementation

Season 3 • Episode 22

Leonard tells Penny about how he met Sheldon and what happened to the elevator.

Saturday, January 31

The Lunar Excitation

Season 3 • Episode 23

Raj and Howard set up an online dating profile for Sheldon and find the perfect woman.

Saturday, January 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.

Saturday, January 31

The Cruciferous Vegetable Amplification

Season 4 • Episode 2

Sheldon realizes he will not live long enough to download his consciousness into a robot body.

Saturday, January 31

The Zazzy Substitution

Season 4 • Episode 3

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

Saturday, January 31

The Plimpton Stimulation

Season 3 • Episode 21

Sheldon invites a famous physicist to the apartment, and competes with Leonard for her attention.

Saturday, January 31

The Staircase Implementation

Season 3 • Episode 22

Leonard tells Penny about how he met Sheldon and what happened to the elevator.

Saturday, January 31

The Lunar Excitation

Season 3 • Episode 23

Raj and Howard set up an online dating profile for Sheldon and find the perfect woman.

Saturday, January 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.

Sunday, February 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.

Sunday, February 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.

Sunday, February 1

The Desperation Emanation

Season 4 • Episode 5

Leonard realizes he is the only one in his group without a girlfriend.

Sunday, February 1

The Irish Pub Formulation

Season 4 • Episode 6

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

Sunday, February 1

The Apology Insufficiency

Season 4 • Episode 7

Sheldon's interview with the FBI jeopardizes Wolowitz's security clearance.

Sunday, February 1

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.

Sunday, February 1

The Boyfriend Complexity

Season 4 • Episode 9

Penny asks Leonard to lie to her father; an all-nighter at a telescope.

Sunday, February 1

The Alien Parasite Hypothesis

Season 4 • Episode 10

Koothrappali and Wolowitz try to prove who would be a better superhero.

Sunday, February 1

The Justice League Recombination

Season 4 • Episode 11

The guys try to bond with Penny's new boyfriend through a costume contest.

Sunday, February 1

The Bus Pants Utilization

Season 4 • Episode 12

Leonard's idea for a smartphone application causes friction in his friendship with Sheldon.

Sunday, February 1

The Love Car Displacement

Season 4 • Episode 13

Bernadette runs into her ex-boyfriend (Rick Fox) while attending a science event with Wolowitz.

Sunday, February 1

The Plimpton Stimulation

Season 3 • Episode 21

Sheldon invites a famous physicist to the apartment, and competes with Leonard for her attention.

Sunday, February 1

The Staircase Implementation

Season 3 • Episode 22

Leonard tells Penny about how he met Sheldon and what happened to the elevator.

Sunday, February 1

The Lunar Excitation

Season 3 • Episode 23

Raj and Howard set up an online dating profile for Sheldon and find the perfect woman.

Sunday, February 1

The Robotic Manipulation

Season 4 • Episode 1

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

Sunday, February 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.

Sunday, February 1

The Zazzy Substitution

Season 4 • Episode 3

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

Sunday, February 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.

Sunday, February 1

The Desperation Emanation

Season 4 • Episode 5

Leonard realizes he is the only one in his group without a girlfriend.

Sunday, February 1

The Irish Pub Formulation

Season 4 • Episode 6

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

Monday, February 2

The Apology Insufficiency

Season 4 • Episode 7

Sheldon's interview with the FBI jeopardizes Wolowitz's security clearance.

Monday, February 2

The Discovery Dissipation

Season 7 • Episode 10

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

Monday, February 2

The Hesitation Ramification

Season 7 • Episode 12

Penny asks Leonard a bold question about their relationship; Sheldon wants to learn how to be funny.

Monday, February 2

The Space Probe Disintegration

Season 8 • Episode 12

The guys agree to do something the girls like; Leonard and Sheldon butt heads.

Monday, February 2

The Anxiety Optimization

Season 8 • Episode 13

Sheldon asks his friends to challenge him in hope of achieving a scientific breakthrough.

Monday, February 2

The Troll Manifestation

Season 8 • Episode 14

Sheldon and Leonard must defend themselves from an online bully's criticism after writing a paper.

Monday, February 2

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.

Monday, February 2

The Intimacy Acceleration

Season 8 • Episode 16

Penny and Sheldon design an experiment -- as a joke -- to make participants fall in love.

Monday, February 2

The Colonization Application

Season 8 • Episode 17

Amy finds out that Sheldon applied for a one-way mission to colonize Mars.

Monday, February 2

The Leftover Thermalization

Season 8 • Episode 18

A magazine article only credits Sheldon in an article about a paper he co-wrote with Leonard.

Monday, February 2

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.

Monday, February 2

The Bus Pants Utilization

Season 4 • Episode 12

Leonard's idea for a smartphone application causes friction in his friendship with Sheldon.

Monday, February 2

The Neonatal Nomenclature

Season 11 • Episode 16

When Bernadette won't go into labor, her friends try different tactics to get things started.

Monday, February 2

The Thespian Catalyst

Season 4 • Episode 14

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

Monday, February 2

The Benefactor Factor

Season 4 • Episode 15

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

Monday, February 2

The Cohabitation Formulation

Season 4 • Episode 16

Wolowitz considers taking things with Bernadette to the next level.

Monday, February 2

The Toast Derivation

Season 4 • Episode 17

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

Monday, February 2

The Prestidigitation Approximation

Season 4 • Episode 18

Leonard must choose between Penny and his new girlfriend, Priya.

Monday, February 2

The Zarnecki Incursion

Season 4 • Episode 19

The guys try to figure out who hacked Sheldon's online-game account.

Monday, February 2

The Herb Garden Germination

Season 4 • Episode 20

Howard decides to take a big step in his relationship with Bernadette.

Monday, February 2

The Agreement Dissection

Season 4 • Episode 21

Priya dissects the roommate agreement; the ladies take Sheldon dancing.

Monday, February 2

The Boyfriend Complexity

Season 4 • Episode 9

Penny asks Leonard to lie to her father; an all-nighter at a telescope.

Tuesday, February 3

The Alien Parasite Hypothesis

Season 4 • Episode 10

Koothrappali and Wolowitz try to prove who would be a better superhero.

Tuesday, February 3

The Gorilla Experiment

Season 3 • Episode 10

Sheldon tries to help Penny understand Leonard's work; Wolowitz gets jealous.

Tuesday, February 3

The Wildebeest Implementation

Season 4 • Episode 22

Raj tries to cure his social anxiety; Penny spies on Leonard and his girlfriend through Bernadette.

Tuesday, February 3

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.

Tuesday, February 3

The Roommate Transmogrification

Season 4 • Episode 24

Bernadette gets her Ph.D., inspiring the guys to tease Wolowitz about his lack of a doctorate.

Tuesday, February 3

The Skank Reflex Analysis

Season 5 • Episode 1

Penny worries that she has ruined her relationship with her friends.

Tuesday, February 3

The Infestation Hypothesis

Season 5 • Episode 2

Amy is caught in the middle when Penny and Sheldon argue over a pre-owned chair.

Tuesday, February 3

The Pulled Groin Extrapolation

Season 5 • Episode 3

Bernadette, Howard and Mrs. Wolowitz spend the weekend together.

Tuesday, February 3

The Wiggly Finger Catalyst

Season 5 • Episode 4

Raj wants a girlfriend, so Penny introduces him to a woman he can communicate with.

Tuesday, February 3

The Athenaeum Allocation

Season 11 • Episode 17

Leonard jumps through hoops to help secure the perfect wedding venue for Sheldon and Amy.

Tuesday, February 3

The Rhinitis Revelation

Season 5 • Episode 6

Sheldon finds himself competing with the gang for his mother's attention when she visits.

Tuesday, February 3

The Good Guy Fluctuation

Season 5 • Episode 7

An attractive comic book artist tests Leonard and Priya's relationship.

Tuesday, February 3

The Isolation Permutation

Season 5 • Episode 8

Amy is devastated when Penny and Bernadette shop for wedding dresses without her.

Tuesday, February 3

The Ornithophobia Diffusion

Season 5 • Episode 9

Leonard and Penny spend time alone; Sheldon tries to face his fear of birds.

Tuesday, February 3

The Flaming Spittoon Acquisition

Season 5 • Episode 10

Sheldon is jealous when Stuart, from the comic book store, asks Amy out on a date.

Tuesday, February 3

The Speckerman Recurrence

Season 5 • Episode 11

Leonard must face the bully who targeted him in high school; Penny confronts her past actions.

Tuesday, February 3

The Shiny Trinket Maneuver

Season 5 • Episode 12

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

Tuesday, February 3

The Recombination Hypothesis

Season 5 • Episode 13

Everything could change when Leonard spontaneously invites Penny to a romantic dinner.

Tuesday, February 3

The Thespian Catalyst

Season 4 • Episode 14

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

Wednesday, February 4

The Benefactor Factor

Season 4 • Episode 15

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

Wednesday, February 4

The Psychic Vortex

Season 3 • Episode 12

Sheldon and Koothrappali attend a mixer; Leonard discovers that Penny believes in psychics.

Wednesday, February 4

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, February 4

The Communication Deterioration

Season 8 • Episode 21

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

Wednesday, February 4

The Graduation Transmission

Season 8 • Episode 22

Wolowitz questions his engineering skills; a canceled flight puts Leonard's plans in jeopardy.

Wednesday, February 4

The Maternal Combustion

Season 8 • Episode 23

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

Wednesday, February 4

The Commitment Determination

Season 8 • Episode 24

While facing relationship changes, Sheldon pushes Penny and Leonard to choose a wedding date.

Wednesday, February 4

The Matrimonial Momentum

Season 9 • Episode 1

Penny must decide if she can get past Leonard's bad behavior.

Wednesday, February 4

The Transporter Malfunction

Season 5 • Episode 20

After receiving new "Star Trek" collectibles, Sheldon finds himself haunted by Mr. Spock.

Wednesday, February 4

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.

Wednesday, February 4

The Lunar Excitation

Season 3 • Episode 23

Raj and Howard set up an online dating profile for Sheldon and find the perfect woman.

Wednesday, February 4

The Love Car Displacement

Season 4 • Episode 13

Bernadette runs into her ex-boyfriend (Rick Fox) while attending a science event with Wolowitz.

Wednesday, February 4

The Cohabitation Formulation

Season 4 • Episode 16

Wolowitz considers taking things with Bernadette to the next level.

Wednesday, February 4

The Toast Derivation

Season 4 • Episode 17

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

Thursday, February 5

The Prestidigitation Approximation

Season 4 • Episode 18

Leonard must choose between Penny and his new girlfriend, Priya.

Thursday, February 5

The Bozeman Reaction

Season 3 • Episode 13

Leonard and Sheldon turn to their friends to create a state-of-the-art security system.

Thursday, February 5

The Stag Convergence

Season 5 • Episode 22

Knowledge of Howard's sexual history makes Bernadette reconsider their future together.

Thursday, February 5

The Launch Acceleration

Season 5 • Episode 23

Wedding plans are jeopardized when NASA reschedules Howard's mission; Leonard surprises Penny.

Thursday, February 5

The Countdown Reflection

Season 5 • Episode 24

The gang tries to help Wolowitz and Bernadette get married before the space launch.

Thursday, February 5

The Date Night Variable

Season 6 • Episode 1

Raj faces his loneliness; Wolowitz gets drawn into a fight between Bernadette and his mom.

Thursday, February 5

The Decoupling Fluctuation

Season 6 • Episode 2

Sheldon tries to intervene when he learns that Penny is thinking about breaking up with Leonard.

Thursday, February 5

The Higgs Boson Observation

Season 6 • Episode 3

Amy feels threatened by Sheldon's new assistant; space starts to wear on Wolowitz.

Thursday, February 5

The Re-Entry Minimization

Season 6 • Episode 4

Wolowitz's return from space isn't all he expected; game night becomes a gender war.

Thursday, February 5

The Tenant Disassociation

Season 11 • Episode 19

Leonard decides to run against Sheldon for president of the tenants association.

Thursday, February 5

The Extract Obliteration

Season 6 • Episode 6

A game threatens Sheldon's relationship with Stephen Hawking; Penny signs up for a college class.

Thursday, February 5

The Habitation Configuration

Season 6 • Episode 7

Sheldon is caught in the middle of Amy and Wil Wheaton's argument.

Thursday, February 5

The 43 Peculiarity

Season 6 • Episode 8

Raj and Howard try to figure out why Sheldon disappears at 2:45 every afternoon.

Thursday, February 5

The Parking Spot Escalation

Season 6 • Episode 9

Sheldon and Wolowitz's fight over a parking spot at the university impacts the whole gang.

Thursday, February 5

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, February 5

The Skank Reflex Analysis

Season 5 • Episode 1

Penny worries that she has ruined her relationship with her friends.

Thursday, February 5

The Zarnecki Incursion

Season 4 • Episode 19

The guys try to figure out who hacked Sheldon's online-game account.

Thursday, February 5

The Herb Garden Germination

Season 4 • Episode 20

Howard decides to take a big step in his relationship with Bernadette.

Friday, February 6

The Agreement Dissection

Season 4 • Episode 21

Priya dissects the roommate agreement; the ladies take Sheldon dancing.

Friday, February 6

The Einstein Approximation

Season 3 • Episode 14

Sheldon tries to figure out the answer to a physics problem by working with Penny.

Friday, February 6

The Separation Oscillation

Season 9 • Episode 2

Leonard tries to ease Penny's mind; Sheldon plans a special episode of "Fun With Flags."

Friday, February 6

The Bachelor Party Corrosion

Season 9 • Episode 3

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

Friday, February 6

The 2003 Approximation

Season 9 • Episode 4

An impending change inspires Sheldon to revert to 2003, before he met Penny and Leonard.

Friday, February 6

The Perspiration Implementation

Season 9 • Episode 5

Barry Kripke expresses interest in Amy while leading a fencing lesson for the guys.

Friday, February 6

The Helium Insufficiency

Season 9 • Episode 6

Leonard and Sheldon try to secure the helium they need during a nation-wide shortage.

Friday, February 6

The Spock Resonance

Season 9 • Episode 7

Sheldon struggles to keep his emotions in check when he is interviewed for a documentary.

Friday, February 6

The Mystery Date Observation

Season 9 • Episode 8

Sheldon, Wolowitz and Koothrappali post an ad online to find a new girlfriend for Sheldon.

Friday, February 6

The Platonic Permutation

Season 9 • Episode 9

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

Friday, February 6

The Monster Isolation

Season 6 • Episode 17

Koothrappali decides to never leave his apartment; Penny's acting skills impress Sheldon.

Friday, February 6

The Contractual Obligation Implementation

Season 6 • Episode 18

Leonard, Sheldon and Wolowitz talk to junior high girls about science-related careers.

Friday, February 6

The Reclusive Potential

Season 11 • Episode 20

A brilliant but reclusive scientist invites Sheldon to his cabin in the middle of nowhere.

Friday, February 6

The Recombination Hypothesis

Season 5 • Episode 13

Everything could change when Leonard spontaneously invites Penny to a romantic dinner.

Friday, February 6

The Beta Test Initiation

Season 5 • Episode 14

Penny and Leonard experiment with their new relationship; Raj forms an unusual bond.

Friday, February 6

The Wildebeest Implementation

Season 4 • Episode 22

Raj tries to cure his social anxiety; Penny spies on Leonard and his girlfriend through Bernadette.

Friday, February 6

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.

Saturday, February 7

The Infestation Hypothesis

Season 5 • Episode 2

Amy is caught in the middle when Penny and Sheldon argue over a pre-owned chair.

Saturday, February 7

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.

Saturday, February 7

The Thespian Catalyst

Season 4 • Episode 14

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

Saturday, February 7

The Benefactor Factor

Season 4 • Episode 15

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

Saturday, February 7

The Cohabitation Formulation

Season 4 • Episode 16

Wolowitz considers taking things with Bernadette to the next level.

Saturday, February 7

The Toast Derivation

Season 4 • Episode 17

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

Saturday, February 7

The Prestidigitation Approximation

Season 4 • Episode 18

Leonard must choose between Penny and his new girlfriend, Priya.

Saturday, February 7

The Zarnecki Incursion

Season 4 • Episode 19

The guys try to figure out who hacked Sheldon's online-game account.

Saturday, February 7

The Herb Garden Germination

Season 4 • Episode 20

Howard decides to take a big step in his relationship with Bernadette.

Saturday, February 7

The Agreement Dissection

Season 4 • Episode 21

Priya dissects the roommate agreement; the ladies take Sheldon dancing.

Saturday, February 7

The Wildebeest Implementation

Season 4 • Episode 22

Raj tries to cure his social anxiety; Penny spies on Leonard and his girlfriend through Bernadette.

Saturday, February 7

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.

Saturday, February 7

The Friendship Contraction

Season 5 • Episode 15

Leonard starts to reconsider his friendship with Sheldon; Wolowitz tries to choose a nickname.

Saturday, February 7

The Launch Acceleration

Season 5 • Episode 23

Wedding plans are jeopardized when NASA reschedules Howard's mission; Leonard surprises Penny.

Saturday, February 7

The Pulled Groin Extrapolation

Season 5 • Episode 3

Bernadette, Howard and Mrs. Wolowitz spend the weekend together.

Saturday, February 7

The Wiggly Finger Catalyst

Season 5 • Episode 4

Raj wants a girlfriend, so Penny introduces him to a woman he can communicate with.

Sunday, February 8

The Russian Rocket Reaction

Season 5 • Episode 5

Wil Wheaton invites Leonard and Sheldon to a party at his house; Howard receives an opportunity.

Sunday, February 8

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, February 8

The Skank Reflex Analysis

Season 5 • Episode 1

Penny worries that she has ruined her relationship with her friends.

Sunday, February 8

The Infestation Hypothesis

Season 5 • Episode 2

Amy is caught in the middle when Penny and Sheldon argue over a pre-owned chair.

Sunday, February 8

The Pulled Groin Extrapolation

Season 5 • Episode 3

Bernadette, Howard and Mrs. Wolowitz spend the weekend together.

Sunday, February 8

The Wiggly Finger Catalyst

Season 5 • Episode 4

Raj wants a girlfriend, so Penny introduces him to a woman he can communicate with.

Sunday, February 8

The Russian Rocket Reaction

Season 5 • Episode 5

Wil Wheaton invites Leonard and Sheldon to a party at his house; Howard receives an opportunity.

Sunday, February 8

The Rhinitis Revelation

Season 5 • Episode 6

Sheldon finds himself competing with the gang for his mother's attention when she visits.

Sunday, February 8

The Good Guy Fluctuation

Season 5 • Episode 7

An attractive comic book artist tests Leonard and Priya's relationship.

Sunday, February 8

The Isolation Permutation

Season 5 • Episode 8

Amy is devastated when Penny and Bernadette shop for wedding dresses without her.

Sunday, February 8

The Ornithophobia Diffusion

Season 5 • Episode 9

Leonard and Penny spend time alone; Sheldon tries to face his fear of birds.

Sunday, February 8

The Date Night Variable

Season 6 • Episode 1

Raj faces his loneliness; Wolowitz gets drawn into a fight between Bernadette and his mom.

Sunday, February 8

The Decoupling Fluctuation

Season 6 • Episode 2

Sheldon tries to intervene when he learns that Penny is thinking about breaking up with Leonard.

Sunday, February 8

The Rhinitis Revelation

Season 5 • Episode 6

Sheldon finds himself competing with the gang for his mother's attention when she visits.

Sunday, February 8

The Isolation Permutation

Season 5 • Episode 8

Amy is devastated when Penny and Bernadette shop for wedding dresses without her.

Monday, February 9

The Ornithophobia Diffusion

Season 5 • Episode 9

Leonard and Penny spend time alone; Sheldon tries to face his fear of birds.

Monday, February 9

The Occupation Recalibration

Season 7 • Episode 13

Sheldon must learn how to relax when he is forced to take a vacation.

Monday, February 9

The Convention Conundrum

Season 7 • Episode 14

Unable to get Comic-Con tickets, Sheldon tries to hold his own convention.

Monday, February 9

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.

Monday, February 9

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.

Monday, February 9

The Sales Call Sublimination

Season 9 • Episode 12

Leonard meets with a psychiatrist; Wolowitz and Bernadette struggle when Stuart moves out.

Monday, February 9

The Empathy Optimization

Season 9 • Episode 13

Leonard, Penny and the gang attempt to treat themselves to a Sheldon-free weekend.

Monday, February 9

The Meemaw Materialization

Season 9 • Episode 14

Sheldon's excitement about his Meemaw's visit fades when she butts heads with Amy.

Monday, February 9

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.

Monday, February 9

The Positive Negative Reaction

Season 9 • Episode 16

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

Monday, February 9

The Celebration Experimentation

Season 9 • Episode 17

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

Monday, February 9

The Deception Verification

Season 7 • Episode 2

Leonard and Sheldon's friendship is tested; Wolowitz's masculinity is threatened.

Monday, February 9

The Comet Polarization

Season 11 • Episode 21

Friendships are threatened when Koothrappali takes credit for Penny's astronomical discovery.

Monday, February 9

The Raiders Minimization

Season 7 • Episode 4

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

Monday, February 9

The Workplace Proximity

Season 7 • Episode 5

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

Monday, February 9

The Romance Resonance

Season 7 • Episode 6

Sheldon's latest scientific breakthrough leaves him feeling like a fraud.

Monday, February 9

The Proton Displacement

Season 7 • Episode 7

When Professor Proton asks Leonard for help with an experiment, Sheldon befriends Proton's rival.

Monday, February 9

The Itchy Brain Simulation

Season 7 • Episode 8

When a mistake comes to light, Sheldon punishes Leonard; Penny decides to confront Raj's ex.

Monday, February 9

The Thanksgiving Decoupling

Season 7 • Episode 9

When the gang decides to spend Thanksgiving at Mrs. Wolowitz's house, Sheldon protests.

Monday, February 9

The Discovery Dissipation

Season 7 • Episode 10

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

Monday, February 9

The Cooper Extraction

Season 7 • Episode 11

While Sheldon is in Texas, the rest of the gang realize how much he has changed their lives.

Tuesday, February 10

The Recombination Hypothesis

Season 5 • Episode 13

Everything could change when Leonard spontaneously invites Penny to a romantic dinner.

Tuesday, February 10

The Excelsior Acquisition

Season 3 • Episode 16

Sheldon ends up in traffic court after getting a ticket because of Penny.

Tuesday, February 10

The Hesitation Ramification

Season 7 • Episode 12

Penny asks Leonard a bold question about their relationship; Sheldon wants to learn how to be funny.

Tuesday, February 10

The Occupation Recalibration

Season 7 • Episode 13

Sheldon must learn how to relax when he is forced to take a vacation.

Tuesday, February 10

The Convention Conundrum

Season 7 • Episode 14

Unable to get Comic-Con tickets, Sheldon tries to hold his own convention.

Tuesday, February 10

The Locomotive Manipulation

Season 7 • Episode 15

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

Tuesday, February 10

The Table Polarization

Season 7 • Episode 16

When Leonard buys a dining room table, Sheldon re-evaluates the changes in his life.

Tuesday, February 10

The Friendship Turbulence

Season 7 • Episode 17

Bernadette tries to negotiate peace between Sheldon and Wolowitz.

Tuesday, February 10

The Mommy Observation

Season 7 • Episode 18

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

Tuesday, February 10

The Monetary Insufficiency

Season 11 • Episode 22

Sheldon tries to win money for science; Penny and Bernadette take Amy wedding dress shopping.

Tuesday, February 10

The Relationship Diremption

Season 7 • Episode 20

Sheldon has a personal crisis when he decides string theory is a waste of his time.

Tuesday, February 10

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.

Tuesday, February 10

The Proton Transmogrification

Season 7 • Episode 22

Professor Proton helps Sheldon deal with grief; Leonard gets into a competition with Penny.

Tuesday, February 10

The Gorilla Dissolution

Season 7 • Episode 23

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

Tuesday, February 10

The Status Quo Combustion

Season 7 • Episode 24

Faced with an uncertain future, Sheldon considers a major change.

Tuesday, February 10

The Locomotion Interruption

Season 8 • Episode 1

Leonard and Amy make an unexpected trip to Arizona to fetch Sheldon; Penny goes for an interview.

Tuesday, February 10

The Junior Professor Solution

Season 8 • Episode 2

Amy takes advantage of the tension between Penny and Bernadette.

Tuesday, February 10

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.

Wednesday, February 11

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.

Wednesday, February 11

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, February 11

The Application Deterioration

Season 9 • Episode 18

The guys file for a patent on their invention; the girls give dating advice to Koothrappali.

Wednesday, February 11

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.

Wednesday, February 11

The Big Bear Precipitation

Season 9 • Episode 20

Sheldon shares a secret about Leonard when they go on a weekend trip with Penny and Amy.

Wednesday, February 11

The Viewing Party Combustion

Season 9 • Episode 21

The gang must choose sides when an argument between Sheldon and Leonard turns into a heated debate.

Wednesday, February 11

The Fermentation Bifurcation

Season 9 • Episode 22

The gang runs into Penny's ex while out at a wine bar; Bernadette spends an evening with Sheldon.

Wednesday, February 11

The Line Substitution Solution

Season 9 • Episode 23

Sheldon wants to go to a movie screening, so he pays Stuart to spend the day with Amy.

Wednesday, February 11

The Champagne Reflection

Season 8 • Episode 10

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

Wednesday, February 11

The Sibling Realignment

Season 11 • Episode 23

Sheldon's mother won't attend his wedding unless he invites his brother.

Wednesday, February 11

The Infestation Hypothesis

Season 5 • Episode 2

Amy is caught in the middle when Penny and Sheldon argue over a pre-owned chair.

Wednesday, February 11

The Pulled Groin Extrapolation

Season 5 • Episode 3

Bernadette, Howard and Mrs. Wolowitz spend the weekend together.

Wednesday, February 11

The Rothman Disintegration

Season 5 • Episode 17

Sheldon and Kripke compete for a corner office; Penny receives a gift from Amy.

Wednesday, February 11

The Transporter Malfunction

Season 5 • Episode 20

After receiving new "Star Trek" collectibles, Sheldon finds himself haunted by Mr. Spock.

Thursday, February 12

The Hawking Excitation

Season 5 • Episode 21

When Wolowitz works with Stephen Hawking, Sheldon is determined to meet the famous scientist.

Thursday, February 12

The Pants Alternative

Season 3 • Episode 18

Sheldon's stage fright stands between him and a coveted award.

Thursday, February 12

The Space Probe Disintegration

Season 8 • Episode 12

The guys agree to do something the girls like; Leonard and Sheldon butt heads.

Thursday, February 12

The Anxiety Optimization

Season 8 • Episode 13

Sheldon asks his friends to challenge him in hope of achieving a scientific breakthrough.

Thursday, February 12

The Troll Manifestation

Season 8 • Episode 14

Sheldon and Leonard must defend themselves from an online bully's criticism after writing a paper.

Thursday, February 12

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.

Thursday, February 12

The Intimacy Acceleration

Season 8 • Episode 16

Penny and Sheldon design an experiment -- as a joke -- to make participants fall in love.

Thursday, February 12

The Colonization Application

Season 8 • Episode 17

Amy finds out that Sheldon applied for a one-way mission to colonize Mars.

Thursday, February 12

The Leftover Thermalization

Season 8 • Episode 18

A magazine article only credits Sheldon in an article about a paper he co-wrote with Leonard.

Thursday, February 12

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, February 12

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.

Thursday, February 12

The Communication Deterioration

Season 8 • Episode 21

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

Thursday, February 12

The Graduation Transmission

Season 8 • Episode 22

Wolowitz questions his engineering skills; a canceled flight puts Leonard's plans in jeopardy.

Thursday, February 12

The Maternal Combustion

Season 8 • Episode 23

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

Thursday, February 12

The Isolation Permutation

Season 5 • Episode 8

Amy is devastated when Penny and Bernadette shop for wedding dresses without her.

Thursday, February 12

The Flaming Spittoon Acquisition

Season 5 • Episode 10

Sheldon is jealous when Stuart, from the comic book store, asks Amy out on a date.

Thursday, February 12

The Stag Convergence

Season 5 • Episode 22

Knowledge of Howard's sexual history makes Bernadette reconsider their future together.

Thursday, February 12

The Launch Acceleration

Season 5 • Episode 23

Wedding plans are jeopardized when NASA reschedules Howard's mission; Leonard surprises Penny.

Friday, February 13

The Countdown Reflection

Season 5 • Episode 24

The gang tries to help Wolowitz and Bernadette get married before the space launch.

Friday, February 13

The Wheaton Recurrence

Season 3 • Episode 19

Penny and Leonard have a fight that threatens their relationship; Sheldon and Wil Wheaton face off.

Friday, February 13

The Convergence Convergence

Season 9 • Episode 24

Leonard's recently divorced parents and Sheldon's devoutly religious mother visit.

Friday, February 13

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, February 13

The Military Miniaturization

Season 10 • Episode 2

Wolowitz has a meeting with Colonel Williams, a representative from the Air Force.

Friday, February 13

The Dependence Transcendence

Season 10 • Episode 3

Sheldon tries an energy drink as the gang races to finish its government project on time.

Friday, February 13

The Cohabitation Experimentation

Season 10 • Episode 4

After her apartment floods, Amy suggests that she and Sheldon move in together.

Friday, February 13

The Hot Tub Contamination

Season 10 • Episode 5

Things do not run smoothly when Amy moves in with Sheldon, and Leonard and Penny have to intervene.

Friday, February 13

The Spock Resonance

Season 9 • Episode 7

Sheldon struggles to keep his emotions in check when he is interviewed for a documentary.

Friday, February 13

The Mystery Date Observation

Season 9 • Episode 8

Sheldon, Wolowitz and Koothrappali post an ad online to find a new girlfriend for Sheldon.

Friday, February 13

The Conjugal Configuration

Season 12 • Episode 1

Penny and Leonard discover they are uncomfortably similar to Amy's parents.

Friday, February 13

The Werewolf Transformation

Season 5 • Episode 18

Sheldon's routine is turned upside down when his barber gets sick.

Friday, February 13

The Weekend Vortex

Season 5 • Episode 19

Sheldon chooses to participate in a guys-only weekend gaming marathon rather than joining Amy.

Friday, February 13

The Date Night Variable

Season 6 • Episode 1

Raj faces his loneliness; Wolowitz gets drawn into a fight between Bernadette and his mom.

Friday, February 13

The Decoupling Fluctuation

Season 6 • Episode 2

Sheldon tries to intervene when he learns that Penny is thinking about breaking up with Leonard.

Saturday, February 14

The Higgs Boson Observation

Season 6 • Episode 3

Amy feels threatened by Sheldon's new assistant; space starts to wear on Wolowitz.

Saturday, February 14

The Spaghetti Catalyst

Season 3 • Episode 20

Sheldon goes to extremes to keep Leonard and Penny happy when they stop speaking to each other.

Saturday, February 14

The Flaming Spittoon Acquisition

Season 5 • Episode 10

Sheldon is jealous when Stuart, from the comic book store, asks Amy out on a date.

Saturday, February 14

The Speckerman Recurrence

Season 5 • Episode 11

Leonard must face the bully who targeted him in high school; Penny confronts her past actions.

Saturday, February 14

The Shiny Trinket Maneuver

Season 5 • Episode 12

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

Saturday, February 14

The Recombination Hypothesis

Season 5 • Episode 13

Everything could change when Leonard spontaneously invites Penny to a romantic dinner.

Saturday, February 14

The Beta Test Initiation

Season 5 • Episode 14

Penny and Leonard experiment with their new relationship; Raj forms an unusual bond.

Saturday, February 14

The Friendship Contraction

Season 5 • Episode 15

Leonard starts to reconsider his friendship with Sheldon; Wolowitz tries to choose a nickname.

Saturday, February 14

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.

Saturday, February 14

The Rothman Disintegration

Season 5 • Episode 17

Sheldon and Kripke compete for a corner office; Penny receives a gift from Amy.

Saturday, February 14

The Mystery Date Observation

Season 9 • Episode 8

Sheldon, Wolowitz and Koothrappali post an ad online to find a new girlfriend for Sheldon.

Saturday, February 14

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.

Saturday, February 14

The Re-Entry Minimization

Season 6 • Episode 4

Wolowitz's return from space isn't all he expected; game night becomes a gender war.

Saturday, February 14

The Extract Obliteration

Season 6 • Episode 6

A game threatens Sheldon's relationship with Stephen Hawking; Penny signs up for a college class.

Saturday, February 14

The Habitation Configuration

Season 6 • Episode 7

Sheldon is caught in the middle of Amy and Wil Wheaton's argument.

Saturday, February 14

The 43 Peculiarity

Season 6 • Episode 8

Raj and Howard try to figure out why Sheldon disappears at 2:45 every afternoon.

Sunday, February 15

The Parking Spot Escalation

Season 6 • Episode 9

Sheldon and Wolowitz's fight over a parking spot at the university impacts the whole gang.

Sunday, February 15

The Werewolf Transformation

Season 5 • Episode 18

Sheldon's routine is turned upside down when his barber gets sick.

Sunday, February 15

The Weekend Vortex

Season 5 • Episode 19

Sheldon chooses to participate in a guys-only weekend gaming marathon rather than joining Amy.

Sunday, February 15

The Transporter Malfunction

Season 5 • Episode 20

After receiving new "Star Trek" collectibles, Sheldon finds himself haunted by Mr. Spock.

Sunday, February 15

The Hawking Excitation

Season 5 • Episode 21

When Wolowitz works with Stephen Hawking, Sheldon is determined to meet the famous scientist.

Sunday, February 15

The Stag Convergence

Season 5 • Episode 22

Knowledge of Howard's sexual history makes Bernadette reconsider their future together.

Sunday, February 15

The Launch Acceleration

Season 5 • Episode 23

Wedding plans are jeopardized when NASA reschedules Howard's mission; Leonard surprises Penny.

Sunday, February 15

The Countdown Reflection

Season 5 • Episode 24

The gang tries to help Wolowitz and Bernadette get married before the space launch.

Sunday, February 15

The Date Night Variable

Season 6 • Episode 1

Raj faces his loneliness; Wolowitz gets drawn into a fight between Bernadette and his mom.

Sunday, February 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.

Sunday, February 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.

Sunday, February 15

The Sales Call Sublimination

Season 9 • Episode 12

Leonard meets with a psychiatrist; Wolowitz and Bernadette struggle when Stuart moves out.

Sunday, February 15

The Empathy Optimization

Season 9 • Episode 13

Leonard, Penny and the gang attempt to treat themselves to a Sheldon-free weekend.

Sunday, February 15

The Meemaw Materialization

Season 9 • Episode 14

Sheldon's excitement about his Meemaw's visit fades when she butts heads with Amy.

Sunday, February 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.

Sunday, February 15

The Bakersfield Expedition

Season 6 • Episode 13

The guys don costumes and go on a road trip to a comic book convention.

Monday, February 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.

Monday, February 16

The Locomotive Manipulation

Season 7 • Episode 15

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

Monday, February 16

The Table Polarization

Season 7 • Episode 16

When Leonard buys a dining room table, Sheldon re-evaluates the changes in his life.

Monday, February 16

A free-spirited beauty moves in next door to two physicists.

Monday, February 16

A free-spirited beauty moves in next door to two physicists.

Monday, February 16

A free-spirited beauty moves in next door to two physicists.

Monday, February 16

A free-spirited beauty moves in next door to two physicists.

Monday, February 16

A free-spirited beauty moves in next door to two physicists.

Monday, February 16

A free-spirited beauty moves in next door to two physicists.

Monday, February 16

A free-spirited beauty moves in next door to two physicists.

Monday, February 16

A free-spirited beauty moves in next door to two physicists.

Monday, February 16

A free-spirited beauty moves in next door to two physicists.

Monday, February 16

A free-spirited beauty moves in next door to two physicists.

Monday, February 16

A free-spirited beauty moves in next door to two physicists.

Monday, February 16

A free-spirited beauty moves in next door to two physicists.

Monday, February 16

A free-spirited beauty moves in next door to two physicists.

Monday, February 16

A free-spirited beauty moves in next door to two physicists.

Monday, February 16

A free-spirited beauty moves in next door to two physicists.

Monday, February 16

A free-spirited beauty moves in next door to two physicists.