Season 9
🎬 24 Episodes 📅 2015 ⏱ 22 min
When an aspiring actress moves into the apartment next door, she inadvertently becomes the missing link in The Big Bang Theory's carefully constructed world of equations and comic books. Sheldon's rigid routines and Leonard's awkward charm collide head-on with her infectious energy, creating an unlikely dynamic that neither group expected. As Howard and Raj watch this clash of personalities unfold, they realize their insular circle might actually benefit from an outsider's perspective. What begins as neighborly annoyance transforms into genuine friendship, proving that sometimes the best connections happen when different worlds unexpectedly collide.
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📊 Season Stats
24
Episodes
2015
Year
22
min / ep
8.8
Watch Hours
9/12
Season No.
⭐ 8.3
Best Episode
Ep. 11 · The Opening Night Exci…
🎬 Episodes 24 episodes
1
⭐ 7.3
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.
🎬 Mark Cendrowski ✍️ Chuck Lorre
2
⭐ 7.3
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.
🎬 Mark Cendrowski ✍️ Steven Molaro
3
⭐ 7.5
The Bachelor Party Corrosion
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.
🎬 Mark Cendrowski ✍️ David Goetsch
4
⭐ 7.5
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.
🎬 Mark Cendrowski ✍️ Chuck Lorre
5
⭐ 7.1
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.
🎬 Mark Cendrowski ✍️ Chuck Lorre
6
⭐ 7.1
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.
🎬 Mark Cendrowski ✍️ Maria Ferrari
7
⭐ 7.7
The Spock Resonance
Wil Wheaton interviews Sheldon for a Star Trek documentary where he reveals the ring and his plan to propose to Amy. Bernadette wants to start renovating the house and the topic of starting a family together with Howard is brought up.
🎬 Nikki Lorre ✍️ Chuck Lorre
8
⭐ 7.5
The Mystery Date Observation
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 on her.
🎬 Mark Cendrowski ✍️ Steven Molaro
9
⭐ 7.6
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.
🎬 Mark Cendrowski ✍️ Tara Hernandez
10
⭐ 7.8
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".
🎬 Mark Cendrowski ✍️ Eric Kaplan
11
⭐ 8.3
The Opening Night Excitation
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.
🎬 Mark Cendrowski ✍️ Steven Molaro
12
⭐ 7.4
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.
🎬 Mark Cendrowski ✍️ Steve Holland
13
⭐ 7.2
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.
🎬 Mark Cendrowski ✍️ Chuck Lorre
14
⭐ 7.2
The Meemaw Materialization
Meemaw meets Amy, but it isn't all roses. Meemaw seems to have an axe to grind with her. Sheldon comes to Amy's defense, but not before Meemaw lets a little secret of his slip.
🎬 Mark Cendrowski ✍️ Chuck Lorre
15
⭐ 7.3
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.
🎬 Mark Cendrowski ✍️ Steven Molaro
16
⭐ 7.4
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.
🎬 Mark Cendrowski ✍️ Eric Kaplan
17
⭐ 7.1
The Celebration Experimentation
After more than nine years together, the gang finally celebrates Sheldon’s birthday, surprising him with a special guest.
🎬 Mark Cendrowski ✍️ Chuck Lorre
18
⭐ 7.3
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.
🎬 Mark Cendrowski ✍️ Steven Molaro
19
⭐ 7.3
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.
🎬 Mark Cendrowski ✍️ Maria Ferrari
20
⭐ 7.3
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.
🎬 Mark Cendrowski ✍️ Chuck Lorre
21
⭐ 7.0
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.
🎬 Mark Cendrowski ✍️ Maria Ferrari
22
⭐ 7.3
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.
🎬 Nikki Lorre ✍️ Steven Molaro
23
⭐ 7.2
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.
🎬 Anthony Rich ✍️ Tara Hernandez
24
⭐ 7.5
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.
🎬 Mark Cendrowski ✍️ Steven Molaro