The Matrimonial Momentum
Series 9, Episode 1 PG
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In the ninth season premiere, Penny struggles with Leonard’s confession that he kissed another girl while on the North Sea. After driving to Vegas, Penny must now decide whether she wants to go through with the wedding. Back home, Sheldon doesn’t know how to act after Amy pushes pause on their relationship.
The Separation Oscillation
Series 9, Episode 2 PG
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After Amy breaks up with Sheldon, he tries to retaliate by filming a special episode of “Fun with Flags.” Leonard, meanwhile, confronts the woman he kissed on the North Sea in an attempt to put Penny’s mind at ease, and Bernadette feels guilty about withholding a secret from Penny.
The Bachelor Party Corrosion
Series 9, Episode 3 PG
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The guys' science skills are put to the test when they get a flat tire during Leonard's surprise bachelor party weekend in Mexico. Meanwhile, the girls force Penny to finally tell her family that she eloped with Leonard.
The 2003 Approximation
Series 9, Episode 4 PG
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When Penny and Leonard announce they’re moving in together, Sheldon decides to revert back to 2003 – a simpler time before he met either of them. Meanwhile, Howard and Raj form a band to play at the Comic Book Store.
The Perspiration Implementation
Series 9, Episode 5 PG
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When the guys take fencing lessons from Barry Kripke (recurring guest star JOHN ROSS BOWIE), Sheldon finds himself in an awkward position when Kripke expresses interest in Amy. Also, Stuart struggles to bring in female customers into the Comic Book Store, so Penny, Amy and Bernadette come by to help him out.
The Helium Insufficiency
Series 9, Episode 6 PG
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In the midst of a nationwide helium shortage, Sheldon and Leonard take desperate measures to obtain the supplies they need on the black market. Meanwhile, Penny and Bernadette download a dating app on Amy's phone in order to find her a new man. MICHAEL RAPAPORT guest stars as their Black Market dealer, Kenny.
The Spock Resonance
Series 9, Episode 7 PG
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While being interviewed for a documentary about Spock, Sheldon struggles to suppress his emotions about his recent break-up with Amy – leaving Leonard and Penny shocked to discover that Sheldon had an engagement ring for Amy. Meanwhile, Howard and Bernadette disagree over remodeling his childhood home. WIL WHEATON, ADAM NIMOY and STEPHEN MERCHANT guest star.
The Mystery Date Observation
Series 9, Episode 8 PG
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With Amy out on a date with a mystery man, Sheldon enlists the help of Howard and Raj to find a new girlfriend by posting online. And when Amy is coy with the details about the guy she’s dating, Penny and Bernadette decide to spy.
The Platonic Permutation
Series 9, Episode 9 PG
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Sheldon and Amy try hanging out as friends when they spend Thanksgiving together at the Aquarium. Meanwhile, Howard reluctantly agrees to volunteer at the soup kitchen with Bernadette, Raj and Emily, while Penny discovers that Leonard knows more about her than she thought.
The Earworm Reverberation
Series 9, Episode 10 PG
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After driving Leonard and Penny crazy by his desperate attempts to remember the name of a song stuck in his head, Sheldon has a revelation when he realizes why. Then, despite their previously awkward date, Amy invites Dave (recurring guest star STEPHEN MERCHANT) over for dinner. And Howard and Raj become obsessed with a fan of their band, Footprints on the Moon.
The Opening Night Excitation
Series 9, Episode 11 PG
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After more than five years of dating, Sheldon and Amy spend their first night together; while Leonard, Howard and Raj must decide who will take their extra Star Wars movie ticket. Recurring guest star BOB NEWHART returns as Sheldon’s Obi-Wan to advise him on his difficult relationship decisions.
The Sales Call Sublimation
Series 9, Episode 12 PG
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Penny gets more than she bargained for when Leonard agrees to meet with a psychiatrist on her behalf. Sheldon and Raj collaborate on an astronomical discovery. Howard and Bernadette can’t believe what they’re feeling after Stuart moves out.
The Empathy Optimization
Series 9, Episode 13 PG
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After having to deal with Sheldon being sick, Leonard, Penny and the gang try to treat themselves to a Sheldon free weekend.
The Meemaw Materialization
Series 9, Episode 14 PG
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Sheldon’s thrilled when his Meemaw (guest star JUNE SQUIBB) comes to visit, but his excitement quickly fades when she butts heads with Amy. Also, Raj meets a new girl (guest star ALESSANDRA TORRESANI) at the comic book store who makes him question his relationship with Emily.
The Valentino Submergence
Series 9, Episode 15 PG
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Sheldon and Amy host a special live Valentine’s Day episode of “Fun with Flags.” While 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 Book Store.
The Positive Negative Reaction
Series 9, Episode 16 PG
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When the gang finds out about Bernadette’s pregnancy, they celebrate by singing karaoke. Meanwhile, Bernadette is concerned when Howard freaks out over her pregnancy announcement, as he’s convinced that he needs to make more money to provide for the baby.
The Celebration Experimentation
Series 9, Episode 17 PG
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After more than nine years together, the gang finally celebrates Sheldon's birthday with a few special guests on the 200th episode. CHRISTINE BARANSKI, SARA GILBERT and WIL WHEATON return and are joined by special guest star ADAM WEST.
The Application Deterioration
Series 9, Episode 18 PG
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Leonard, Sheldon and Howard run into problems when they file for a patent for their infinite persistence gyroscope. Meanwhile, Penny, Amy and Bernadette give Raj dating advice after Emily reaches out to him after their breakup.
The Soldier Excursion Diversion
Series 9, Episode 19 PG
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When Sheldon’s laptop dies, it leads him to share a deep secret with Amy after she buys him a new one; Meanwhile, Raj sells out Leonard and Howard after they lie to their wives in order to attend an early screening of a movie.
The Big Bear Precipitation
Series 9, Episode 20 PG
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Sheldon spills a secret of Leonard’s when the two take a weekend cabin trip with Penny and Amy; Meanwhile Howard and Bernadeitte must draw the line when Raj goes overboard with pregnancy gifts.
The Viewing Party Combustion
Series 9, Episode 21 PG
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When a small argument between Leonard and Sheldon erupts into a heated fight, everyone must take sides during a group get-together.
The Fermentation Bifurcation
Series 9, Episode 22 PG
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The gang goes to a wine bar and runs into Penny’s old boyfriend, Zack (recurring guest star BRIAN THOMAS SMITH); 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 Raj introduces his new girlfriend, Claire (ALESSANDRA TORRESANI).
The Line Substitution Solution
Series 9, Episode 23 PG
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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.
The Convergence Convergence
Series 9, Episode 24 PG
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Chaos ensues in the ninth season finale when Leonard’s recently divorced parents (special guest stars JUDD HIRSCH and CHRISTINE BARANSKI) and Sheldon’s devoutly religious mother come to town. Meanwhile, Howard and Raj think the government is out to get them, when they’re contacted about their guidance system.