Episode 1
Aired Sep 21, 2015
The Matrimonial Momentum
Sheldon struggles to understand what is going on with Amy; Penny must decide if she can get past Leonard's bad behavior.
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Episode 2
Aired Sep 28, 2015
The Separation Oscillation
Leonard tries to ease Penny's mind; Sheldon plans a special episode of "Fun With Flags"; Bernadette feels bad about keeping a secret.
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Episode 3
Aired Oct 5, 2015
The Bachelor Party Corrosion
A flat tire during Leonard's bachelor party weekend in Mexico tests the guys' skills; Penny is compelled to tell her family that she and Leonard eloped.
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Episode 4
Aired Oct 12, 2015
The 2003 Approximation
An impending change to his living arrangements inspires Sheldon to revert to 2003, before he met Penny and Leonard; Raj and Howard form a band.
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Episode 5
Aired Oct 19, 2015
The Perspiration Implementation
Barry Kripke expresses interest in Amy while leading a fencing lesson for the guys; when Stuart tries to attract female customers to the store, Penny, Amy and Bernadette help out.
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Episode 6
Aired Oct 26, 2015
The Helium Insufficiency
Leonard and Sheldon go to great lengths to secure the helium they need during a nation-wide shortage; Bernadette and Penny try to to find Amy a new man on a dating app.
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Episode 7
Aired Nov 5, 2015
The Spock Resonance
Sheldon struggles to keep his emotions in check when he is interviewed for a documentary about Spock; Penny and Leonard make a surprising discovery; Wolowitz and Bernadette get into a disagreement about remodeling his childhood home.
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Episode 8
Aired Nov 12, 2015
The Mystery Date Observation
Sheldon, Wolowitz and Koothrappali post an ad online to find a new girlfriend for Sheldon; Penny and Bernadette decide to spy when Amy is secretive about who she is dating.
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Episode 9
Aired Nov 19, 2015
The Platonic Permutation
Amy and Sheldon spend Thanksgiving at the aquarium -- as friends; Wolowitz volunteers at the soup kitchen with Raj, Emily and Bernadette; Penny realizes that Leonard knows her better than she thought.
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Episode 10
Aired Dec 10, 2015
The Earworm Reverberation
Sheldon has a song stuck in his head; despite their awkward date, Amy asks Dave over for dinner; Koothrappali and Wolowitz are obsessed with a fan of their band.
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Episode 11
Aired Dec 17, 2015
The Opening Night Excitation
After dating for more than five years, Amy and Sheldon spend the night together for the first time; Leonard, Wolowitz, and Koothrappali must decide what to do with an extra movie ticket.
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Episode 12
Aired Jan 7, 2016
The Sales Call Sublimination
Leonard agrees to meet with a psychiatrist (Jane Kaczmarek) on Penny's behalf; Sheldon and Koothrappali work together on an astronomical discovery; Wolowitz and Bernadette struggle with their feelings when Stuart moves out.
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Episode 13
Aired Jan 14, 2016
The Empathy Optimization
After dealing with Sheldon while he was sick, Leonard, Penny and the gang attempt to treat themselves to a Sheldon-free weekend.
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Episode 14
Aired Feb 4, 2016
The Meemaw Materialization
Sheldon's excitement about his Meemaw's visit fades when she butts heads with Amy; Raj questions his relationship with Emily after meeting someone new.
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Episode 15
Aired Feb 11, 2016
The Valentino Submergence
Amy and Sheldon host a Valentine's Day edition of Fun With Flags; Penny and Leonard wrestle with getting older; Howard and Bernadette make a discovery in their hot tub; Raj is torn between Emily and another woman.
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Episode 16
Aired Feb 18, 2016
The Positive Negative Reaction
The gang celebrates news of Bernadette's pregnancy by singing karaoke; Wolowitz's reaction to the pregnancy announcement worries Bernadette; Wolowitz believes he needs to make more money to support his growing family.
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Episode 17
Aired Feb 25, 2016
The Celebration Experimentation
For the first time in nine years, the gang celebrates Sheldon's birthday -- surprising him with a special guest.
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Episode 18
Aired Mar 10, 2016
The Application Deterioration
Leonard, Sheldon and Wolowitz file for a patent on their new invention; Penny, Amy and Bernadette give dating advice to Koothrappali after his breakup with Emily.
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Episode 19
Aired Mar 31, 2016
The Solder Excursion Diversion
Sheldon makes a surprise revelation when Amy buys him a new laptop; Leonard and Wolowitz get sold out by Koothrappali after lying to their wives to attend a movie screening.
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Episode 20
Aired Apr 7, 2016
The Big Bear Precipitation
Sheldon shares a secret about Leonard when the two go on a weekend trip with Penny and Amy; Koothrappali goes all out with pregnancy gifts.
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Episode 21
Aired Apr 21, 2016
The Viewing Party Combustion
During a group get-together, a minor argument between Sheldon and Leonard turns into a heated debate, leaving the rest of the gang to choose sides.
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Episode 22
Aired Apr 28, 2016
The Fermentation Bifurcation
The gang runs into Penny's old boyfriend while out at a wine bar; Bernadette spends an evening with Sheldon; Koothrappali's introduction of his new girlfriend doesn't go as planned.
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Episode 23
Aired May 5, 2016
The Line Substitution Solution
Sheldon wants to go to a movie screening, so he pays Stuart to spend the day with Amy; Penny has a difficult time connecting with Leonard's visiting mother.
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Episode 24
Aired May 12, 2016
The Convergence Convergence
Leonard's recently divorced parents and Sheldon's devoutly religious mother visit; when they are contacted about their guidance system, Wolowitz and Koothrappali think the government is after them.
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