The Big Bang Theory/Season Nine

Season Nine
The Big Bang Theory
Season Premiere	September 21, 2015
Season Finale	May 12, 2016
Episode Count	24
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Season Nine of The Big Bang Theory premiered on September 21, 2015.

Episodes

#	#	Title	Written By	Directed By	Airdate	Viewers	18-49 Rating	Prod.
184	1	The Matrimonial Momentum	Chuck Lorre & Jim Reynolds & Maria Ferrari	Mark Cendrowski	September 21, 2015	18.203M	4.7%	4X7201
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. Teleplay by Steven Molaro & Steve Holland & Eric Kaplan
185	2	The Separation Oscillation	Steven Molaro & Steve Holland & Tara Hernandez	Mark Cendrowski	September 28, 2015	15.231M	3.8%	4X7202
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. Teleplay by Chuck Lorre & Jim Reynolds & Maria Ferrari
186	3	The Bachelor Party Corrosion	Dave Goetsch & Jim Reynolds & Jeremy Howe	Mark Cendrowski	October 5, 2015	15.396M	3.9%	4X7203
The guys' science skills are put to the test when they get a flat tire during Leonard's bachelor party weekend in Mexico. Also, the girls force Penny to finally tell her family that she eloped with Leonard. Teleplay by Steven Molaro & Steve Holland & Eric Kaplan
187	4	The 2003 Approximation	Chuck Lorre & Steve Holland & Eric Kaplan	Mark Cendrowski	October 12, 2015	14.957M	3.9%	4X7204
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. Teleplay by Steven Molaro & Maria Ferrari & Tara Hernandez
188	5	The Perspiration Implementation	Chuck Lorre & Eric Kaplan & Maria Ferrari	Mark Cendrowski	October 19, 2015	14.684M	3.9%	4X7205
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. Teleplay by Steve Holland & Jim Reynolds & Saladin K. Patterson
189	6	The Helium Insufficiency	Steve Holland & Maria Ferrari & Anthony Del Broccolo	Mark Cendrowski	October 26, 2015	16.364M	4.4%	4X7207
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. Teleplay by Steven Molaro & Eric Kaplan & Jim Reynolds
190	7	The Spock Resonance	Chuck Lorre & Jim Reynolds & Tara Hernandez	Nikki Lorre	November 5, 2015	14.811M	3.7%	4X7206
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. Teleplay by Steven Molaro & Steve Holland & Jeremy Howe
191	8	The Mystery Date Observation	Steven Molaro & Eric Kaplan & Jim Reynolds	Mark Cendrowski	November 12, 2015	14.915M	3.7%	4X7208
Sheldon, Wolowitz and Koothrappali post an online advertisement to find Sheldon a new girlfriend. Also, when Amy is coy with details about a guy she is dating, Penny and Bernadette decide to spy. Teleplay by Chuck Lorre & Steve Holland & Tara Hernandez
192	9	The Platonic Permutation	Jim Reynolds & Jeremy Howe & Tara Hernandez	Mark Cendrowski	November 19, 2015	15.194M	3.8%	4X7209
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. Teleplay by Steve Holland & Maria Ferrari & Adam Faberman
193	10	The Earworm Reverberation	Eric Kaplan & Jim Reynolds & Saladin K. Patterson	Mark Cendrowski	December 10, 2015	15.269M	3.8%	4X7210
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." Teleplay by Steven Molaro & Steve Holland & Jeremy Howe
194	11	The Opening Night Excitation	Steven Molaro & Eric Kaplan & Tara Hernandez	Mark Cendrowski	December 17, 2015	17.225M	4.1%	4X7211
After more than five years of dating, Sheldon and Amy spend their first night together. Also, Leonard, Wolowitz, and Koothrappali must decide who will take their extra Star Wars movie ticket. Teleplay by Steve Holland & Jim Reynolds & Maria Ferrari
195	12	The Sales Call Sublimation	Steve Holland & Jim Reynolds & Saladin K. Patterson	Mark Cendrowski	January 7, 2016	15.846M	3.8%	4X7212
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. Teleplay by Steven Molaro & Maria Ferrari & Anthony Del Broccolo
196	13	The Empathy Optimization	Chuck Lorre & Eric Kaplan & Dave Goetsch	Mark Cendrowski	January 14, 2016	15.751M	3.8%	4X7213
After having to deal with a sick Sheldon, Leonard, Penny and the gang try to treat themselves to a Sheldon-free weekend. Teleplay by Steven Molaro & Steve Holland & Saladin K. Patterson
197	14	The Meemaw Materialization	Chuck Lorre & Jim Reynolds & Maria Ferrari	Mark Cendrowski	February 4, 2016	15.29M	3.8%	4X7214
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. Teleplay by Steven Molaro & Steve Holland & Tara Hernandez
198	15	The Valentino Submergence	Steven Molaro & Jim Reynolds & Tara Hernandez	Mark Cendrowski	February 11, 2016	16.249M	3.8%	4X7215
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. Teleplay by Steve Holland & Eric Kaplan & Jeremy Howe
199	16	The Positive Negative Reaction	Eric Kaplan & Jim Reynolds & Saladin K. Patterson	Mark Cendrowski	February 18, 2016	15.24M	3.8%	4X7216
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. Teleplay by Steven Molaro & Steve Holland & Maria Ferrari
200	17	The Celebration Experimentation	Chuck Lorre & Eric Kaplan & Jeremy Howe	Mark Cendrowski	February 25, 2016	15.937M	3.8%	4X7217
After more than nine years together, the gang finally celebrates Sheldon's birthday, surprising him with a special guest. Teleplay by Steven Molaro & Steve Holland & Tara Hernandez
201	18	The Application Deterioration	Steven Molaro & Eric Kaplan & Adam Faberman	Mark Cendrowski	March 10, 2016	14.682M	3.5%	4X7218
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. Teleplay by Steve Holland & Jim Reynolds & Maria Ferrari
202	19	The Solder Excursion Diversion	Bill Prady & Eric Kaplan & Maria Ferrari	Mark Cendrowski	March 31, 2016	14.237M	3.5%	4X7219
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. Teleplay by Steven Molaro & Steve Holland & Saladin K. Patterson
203	20	The Big Bear Precipitation	Chuck Lorre & Dave Goetsch & Tara Hernandez	Mark Cendrowski	April 7, 2016	13.502M	3.1%	4X7220
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. Teleplay by Steven Molaro & Steve Holland & Jim Reynolds
204	21	The Viewing Party Combustion	Eric Kaplan & Maria Ferrari & Jeremy Howe	Mark Cendrowski	April 21, 2016	14.155M	3.2%	4X7221
Everyone must choose sides when a small argument between Leonard and Sheldon erupts into a heated fight during a group get-together. Teleplay by Steven Molaro & Steve Holland & Tara Hernandez
205	22	The Fermentation Bifurcation	Steven Molaro & Jim Reynolds & Anthony Del Broccolo	Nikki Lorre	April 28, 2016	14.129M	3.4%	4X7222
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. Teleplay by Chuck Lorre & Steve Holland & Tara Hernandez
206	23	The Line Substitution Solution	Steve Holland & Saladin K. Patterson & Tara Hernandez	Anthony Rich	May 5, 2016	13.223M	3%	4X7223
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. Teleplay by Steven Molaro & Eric Kaplan & Maria Ferrari
207	24	The Convergence Convergence	Steven Molaro & Tara Hernandez & Adam Faberman	Mark Cendrowski	May 12, 2016	14.726M	3.4%	4X7224
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. Teleplay by Chuck Lorre & Steve Holland & Jeremy Howe