Last episode
The Stockholm Syndrome
s12e24 · 2019-05-17
Ended · US
The Big Bang Theory
CBS Scripted
What it is
The Big Bang Theory is a comedy about brilliant physicists, Leonard and Sheldon, who are the kind of "beautiful minds" that understand how the universe works. But none of that genius helps them interact with people, especially women. All this begins to change when a free-spirited beauty named Penny moves in next door. Sheldon, Leonard's roommate, is quite content spending his nights playing Klingon Boggle with their socially dysfunctional friends, fellow Cal Tech scientists Wolowitz and Koothrappali. However, Leonard sees in Penny a whole new universe of possibilities... including love.
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24 this season · 279 totals09e01 The Matrimonial Momentum 2015-09-22 00:00
The Matrimonial Momentum
After driving to Vegas to get married, Penny struggles with Leonard's confession that he kissed another girl. Also, Sheldon doesn't know how to act after Amy pushes pause on their relationship.
s09e02 The Separation Oscillation 2015-09-29 00:00
The Separation Oscillation
Leonard confronts the woman he kissed on the North Sea in an attempt to set Penny's mind at ease. Also, Sheldon films a special episode of 'Fun with Flags' after his breakup with Amy, and Bernadette feels guilty about withholding a secret from Penny.
s09e03 The Bachelor Party Corrosion 2015-10-06 00:00
The Bachelor Party Corrosion
The guys surprise Leonard with a belated bachelor-party weekend in Mexico, but their plans hit a bump in the road when they get a flat tire on the way. Meanwhile, the girls lean on Penny to tell her unsuspecting family that she and Leonard eloped.
s09e04 The 2003 Approximation 2015-10-13 00:00
The 2003 Approximation
Sheldon learns of an impending change in his living arrangements and decides to revert back to 2003, a simpler time before he met Leonard and Penny. Also, Howard and Raj form a band to play at the Comic Book Store.
s09e05 The Perspiration Implementation 2015-10-20 00:00
The Perspiration Implementation
The guys take a fencing lesson from Barry Kripke and Sheldon finds himself in an awkward position when Kripke expresses interest in Amy. Also, when Stuart struggles to get female customers at the Comic Book Store, Penny, Amy and Bernadette come by to help him out.
s09e06 The Helium Insufficiency 2015-10-27 00:00
The Helium Insufficiency
In the midst of a nation-wide helium shortage, Sheldon and Leonard take desperate measures to get the supplies they need. Also, Penny and Bernadette download a dating app on Amy's phone to try and find her a new man.
s09e07 The Spock Resonance 2015-11-06 01:00
The Spock Resonance
While being interviewed for a documentary about Spock from 'Star Trek', Sheldon struggles to suppress his emotions about his recent break-up with Amy. Also, Wolowitz and Bernadette butt heads over remodeling his childhood home.
s09e08 The Mystery Date Observation 2015-11-13 01:00
The Mystery Date Observation
When Leonard, Penny and Bernadette learn that Amy is going out on a dinner date, the trio set out to spy on her and the guy. Meanwhile, Sheldon recruits Raj and Howard to find a woman for him, since they were responsible for getting Amy and him together.
s09e09 The Platonic Permutation 2015-11-20 01:00
The Platonic Permutation
Sheldon and Amy try hanging out as friends when they spend Thanksgiving together at the aquarium. Also, Wolowitz reluctantly agrees to volunteer at the soup kitchen with Bernadette, Raj and Emily, and Penny discovers that Leonard knows more about her than she thought.
s09e10 The Earworm Reverberation 2015-12-11 01:00
The Earworm Reverberation
Sheldon has a revelation when he realizes why a song was stuck in his head. Also, Amy invites Dave over for dinner despite their previously awkward date, and Wolowitz and Koothrappali become obsessed with a fan of their band, 'Footprints on the Moon'.
s09e11 The Opening Night Excitation 2015-12-18 01:00
The Opening Night Excitation
As the guys prepare to go to the premiere of the new Star Wars movie, Sheldon plans a special event for Amy's birthday. Also, Leonard, Wolowitz, and Koothrappali must decide who will take their extra Star Wars movie ticket.
s09e12 The Sales Call Sublimation 2016-01-08 01:00
The Sales Call Sublimation
Penny gets more than she bargained for when Leonard agrees to meet with a psychiatrist on her behalf. Also, Sheldon and Koothrappali collaborate on an astronomical discovery, and Wolowitz and Bernadette can't believe what they are feeling after Stuart moves out.
s09e13 The Empathy Optimization 2016-01-15 01:00
The Empathy Optimization
After having to deal with a sick Sheldon, Leonard, Penny and the gang try to treat themselves to a Sheldon-free weekend.
s09e14 The Meemaw Materialization 2016-02-05 01:00
The Meemaw Materialization
Sheldon's thrilled when his Meemaw comes to visit, but his excitement quickly fades when she butts heads with Amy. Also, Raj meets a new girl at the comic book store who makes him question his relationship with Emily.
s09e15 The Valentino Submergence 2016-02-12 01:00
The Valentino Submergence
Sheldon and Amy host a live Valentine's Day episode of Fun with Flags, Leonard and Penny grapple with getting older, Howard and Bernadette find a surprise in their hot tub and Raj is torn between Emily and the cute girl he met at the Comic Bookstore.
s09e16 The Positive Negative Reaction 2016-02-19 01:00
The Positive Negative Reaction
When the gang finds out about Bernadette's pregnancy, they celebrate by singing karaoke. Also, Bernadette is concerned when Wolowitz freaks out over her pregnancy announcement, and Wolowitz is convinced he must make more money to provide for the baby.
s09e17 The Celebration Experimentation 2016-02-26 01:00
The Celebration Experimentation
After more than nine years together, the gang finally celebrates Sheldon's birthday, surprising him with a special guest.
s09e18 The Application Deterioration 2016-03-11 01:00
The Application Deterioration
Leonard, Sheldon, and Wolowitz run into problems when they file for a patent for their infinite persistence gyroscope. Also, Penny, Amy and Bernadette give Koothrappali dating advice when Emily reaches out to him after their breakup.
s09e19 The Solder Excursion Diversion 2016-04-01 00:00
The Solder Excursion Diversion
Amy is shocked at a revelation from Sheldon after she buys him a new laptop. Also, Koothrappali sells out Leonard and Wolowitz after they lie to their wives in order to attend an early screening of a movie.
s09e20 The Big Bear Precipitation 2016-04-08 00:00
The Big Bear Precipitation
Sheldon spills a secret of Leonard's when the two take a weekend cabin trip with Penny and Amy. Also, when Koothrappali goes overboard with pregnancy gifts, Wolowitz and Bernadette must draw the line.
s09e21 The Viewing Party Combustion 2016-04-22 00:00
The Viewing Party Combustion
Everyone must choose sides when a small argument between Leonard and Sheldon erupts into a heated fight during a group get-together.
s09e22 The Fermentation Bifurcation 2016-04-29 00:00
The Fermentation Bifurcation
The gang goes to a wine bar and runs into Penny's old boyfriend, Zack. Also, Bernadette gets stuck spending the evening with Sheldon when she can't go wine tasting with the group, and things don't go as planned when Koothrappali introduces his new girlfriend, Claire.
s09e23 The Line Substitution Solution 2016-05-06 00:00
The Line Substitution Solution
Sheldon hires Stuart to spend the day with Amy when he'd rather go to a movie screening. Also, Leonard's mother, Beverly, comes to town and Penny struggles to make a connection with her.
s09e24 The Convergence Convergence 2016-05-13 00:00
The Convergence Convergence
Chaos ensues when Leonard's recently divorced parents, Alfred and Beverly, and Sheldon's devoutly religious mother, Mary, come to town. Also, Wolowitz and Koothrappali think the government is out to get them when they are contacted about their guidance system.