The Big Bang Theory: Season 9
In the ninth season of The Big Bang Theory, the lives of roommates Leonard and Sheldon and their social circle continue to evolve as they navigate the complexities of adulthood beyond the laboratory. The narrative picks up following significant developments from the previous season. Sheldon, who had embarked on a period of soul-searching, faces a turning point regarding his Relationship Agreement with Amy. Meanwhile,
Season 9 Lore Primer
Key plot threads, lore context, and character stakes you need to remember before diving into this season.
- Leonard and Sheldon are brilliant but socially awkward physicists living as roommates in Pasadena.
- Penny is an aspiring actress who lives across the hall and expanded the group's social circle.
- The group consists of core members Leonard, Sheldon, Howard, and Raj, alongside their romantic partners.
- The characters frequently navigate the intersection of their professional lives in the lab and their personal social interactions.
Season overview
In the ninth season of The Big Bang Theory, the lives of roommates Leonard and Sheldon and their social circle continue to evolve as they navigate the complexities of adulthood beyond the laboratory. The narrative picks up following significant developments from the previous season. Sheldon, who had embarked on a period of soul-searching, faces a turning point regarding his Relationship Agreement with Amy. Meanwhile, Leonard and Penny head to Las Vegas with the intention of finally getting married. As the group dynamic shifts, Howard adjusts to life with Bernadette following the sudden passing of his mother, marking a period of transition for the couple. Simultaneously, Raj experiences growth in his personal life, moving past his previous struggles with communication to establish an exclusive relationship with Emily. Throughout the season, the characters are forced to confront the reality that their experiences with love and friendship rarely yield predictable results. As these physicists and their friends continue to grow, they remain smarter but no wiser, dealing with the unpredictable nature of their personal lives while maintaining their established bonds in Pasadena.
Episode Guide
Season 9 Progress Shield
The Matrimonial Momentum
Sep 21, 2015 · 19 min
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
The Separation Oscillation
Sep 28, 2015 · 19 min
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 A
The Bachelor Party Corrosion
Oct 5, 2015 · 19 min
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 tha
The 2003 Approximation
Oct 12, 2015 · 19 min
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 ban
The Perspiration Implementation
Oct 19, 2015 · 19 min
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 c
The Helium Insufficiency
Oct 26, 2015 · 19 min
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
The Spock Resonance
Nov 5, 2015 · 19 min
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 o
The Mystery Date Observation
Nov 12, 2015 · 18 min
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
The Platonic Permutation
Nov 19, 2015 · 21 min
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
The Earworm Reverberation
Dec 10, 2015 · 21 min
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 Koothrapp
The Opening Night Excitation
Dec 17, 2015 · 21 min
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 mo
The Sales Call Sublimation
Jan 7, 2016 · 18 min
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 W
The Empathy Optimization
Jan 14, 2016 · 19 min
After having to deal with a sick Sheldon, Leonard, Penny and the gang try to treat themselves to a Sheldon-free weekend.
The Meemaw Materialization
Feb 4, 2016 · 19 min
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.
The Valentino Submergence
Feb 11, 2016 · 20 min
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
The Positive Negative Reaction
Feb 18, 2016 · 19 min
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, a
The Celebration Experimentation
Feb 25, 2016 · 19 min
After more than nine years together, the gang finally celebrates Sheldon’s birthday, surprising him with a special guest.
The Application Deterioration
Mar 10, 2016 · 18 min
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 advi
The Solder Excursion Diversion
Mar 31, 2016 · 21 min
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 e
The Big Bear Precipitation
Apr 7, 2016 · 19 min
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 Bernadet
The Viewing Party Combustion
Apr 21, 2016 · 18 min
Everyone must choose sides when a small argument between Leonard and Sheldon erupts into a heated fight during a group get-together.
The Fermentation Bifurcation
Apr 28, 2016 · 20 min
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,
The Line Substitution Solution
May 5, 2016 · 18 min
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 wit
The Convergence Convergence
May 12, 2016 · 20 min
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 go