The Big Bang Theory: Season 9

2015 · 24 episodes · ★ 7.4

What Season 9 of The Big Bang Theory

Season 9 opens with Leonard and Penny on the verge of taking the plunge into marriage, though his infidelity still hangs over the couple. Penny has to decide whether she has moved past it, and Leonard is willing to work hard to make sure she does. Sheldon, on the other hand, struggles with the changes that come with his friends moving in together and with his own relationship with Amy, and he resists every new development. Howard and Raj, just as awkward at connecting with others, get tangled up in their dates and in projects like forming a band. Adulthood starts to take its toll on the group, which has to deal with relationships taking unexpected turns.

24episodes

Sep 21, 2015premiered

May 12, 2016latest episode

7.7 hrtotal runtime

Season 9 Episodes

9x01 The Matrimonial Momentum
Sep 21, 2015 · 19 min · ★ 7.3
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.
Directing: Mark Cendrowski · Writing: Steven Molaro, Steve Holland, Eric Kaplan · Starring: Kevin Sussman, Laurie Metcalf, Jim Meskimen, Louise Claps
9x02 The Separation Oscillation
Sep 28, 2015 · 19 min · ★ 7.3
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.
Directing: Mark Cendrowski · Writers: Jim Reynolds, Chuck Lorre, Maria Ferrari · Starring: Melissa Tang
9x03 The Bachelor Party Corrosion
Oct 5, 2015 · 19 min · ★ 7.5
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.
Directing: Mark Cendrowski · Writers: Steven Molaro, Steve Holland, Eric Kaplan · Starring: Keith Carradine
9x04 The 2003 Approximation
Oct 12, 2015 · 19 min · ★ 7.5
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.
Directing: Mark Cendrowski · Writing: Steven Molaro, Tara Hernandez, Maria Ferrari · Starring: Kevin Sussman, Laura Spencer, Craig Welzbacher, Kurt Koehler
9x05 The Perspiration Implementation
Oct 19, 2015 · 19 min · ★ 7.1
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.
Directing: Mark Cendrowski · Writers: Steven Molaro, Jim Reynolds, Saladin K. Patterson · Starring: Kevin Sussman, John Ross Bowie, Megan Heyn, Patrika Darbo
9x06 The Helium Insufficiency
Oct 26, 2015 · 19 min · ★ 7.1
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.
Directing: Mark Cendrowski · Writing: Steven Molaro, Jim Reynolds, Eric Kaplan · Starring: Kevin Sussman, John Ross Bowie, Michael Rapaport, Elena Campbell-Martinez
9x07 The Spock Resonance
Nov 5, 2015 · 19 min · ★ 7.7
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.
Directing: Nikki Lorre · Writers: Steven Molaro, Steve Holland, Jeremy Howe · Starring: Adam Nimoy, Casey Sander, Stephen Merchant, Wil Wheaton
9x08 The Mystery Date Observation
Nov 12, 2015 · 18 min · ★ 7.5
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.
Directing: Mark Cendrowski · Writing: Tara Hernandez, Steve Holland, Chuck Lorre · Starring: Stephen Merchant, Lio Tipton
9x09 The Platonic Permutation
Nov 19, 2015 · 21 min · ★ 7.5
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.
Directing: Mark Cendrowski · Writing: Steve Holland, Maria Ferrari, Adam Faberman · Starring: Laura Spencer, Elon Musk, Wayne Wilderson
9x10 The Earworm Reverberation
Dec 10, 2015 · 21 min · ★ 7.9
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".
Directing: Mark Cendrowski · Writers: Steven Molaro, Steve Holland, Jeremy Howe · Starring: Yoshi Barrigas, Stephen Merchant
9x11 The Opening Night Excitation Mid-Season Finale
Dec 17, 2015 · 21 min · ★ 8.3
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.
Directing: Mark Cendrowski · Writing: Jim Reynolds, Steve Holland, Maria Ferrari · Starring: Kevin Sussman, Jeff Witzke, Wil Wheaton, Bob Newhart
9x12 The Sales Call Sublimation
Jan 7, 2016 · 18 min · ★ 7.3
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.
Directing: Mark Cendrowski · Writing: Steven Molaro, Maria Ferrari, Anthony Del Broccolo · Starring: Kevin Sussman, Jane Kaczmarek
9x13 The Empathy Optimization
Jan 14, 2016 · 19 min · ★ 7.3
After having to deal with a sick Sheldon, Leonard, Penny and the gang try to treat themselves to a Sheldon-free weekend.
Directing: Mark Cendrowski · Writers: Steven Molaro, Steve Holland, Saladin K. Patterson · Starring: Kevin Sussman, Laura Spencer
9x14 The Meemaw Materialization
Feb 4, 2016 · 19 min · ★ 7.3
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.
Directing: Mark Cendrowski · Writing: Steven Molaro, Tara Hernandez, Steve Holland · Starring: June Squibb, Alessandra Torresani, Declan Churchill Carter
9x15 The Valentino Submergence
Feb 11, 2016 · 20 min · ★ 7.3
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.
Directing: Mark Cendrowski · Writers: Steve Holland, Eric Kaplan, Jeremy Howe · Starring: Laura Spencer, John Ross Bowie, Alessandra Torresani, Creagen Dow
9x16 The Positive Negative Reaction
Feb 18, 2016 · 19 min · ★ 7.4
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.
Directing: Mark Cendrowski · Writing: Steven Molaro, Steve Holland, Maria Ferrari
9x17 The Celebration Experimentation
Feb 25, 2016 · 19 min · ★ 7.1
After more than nine years together, the gang finally celebrates Sheldon’s birthday, surprising him with a special guest.
Directing: Mark Cendrowski · Writers: Steven Molaro, Tara Hernandez, Steve Holland · Starring: Kevin Sussman, Sara Gilbert, John Ross Bowie, Adam West
9x18 The Application Deterioration
Mar 10, 2016 · 18 min · ★ 7.3
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.
Directing: Mark Cendrowski · Writers: Jim Reynolds, Steve Holland, Maria Ferrari · Starring: Laura Spencer, Alessandra Torresani, Jim Holmes
9x19 The Solder Excursion Diversion
Mar 31, 2016 · 21 min · ★ 7.3
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.
Directing: Mark Cendrowski · Writing: Steven Molaro, Steve Holland, Saladin K. Patterson · Starring: H. Michael Croner
9x20 The Big Bear Precipitation
Apr 7, 2016 · 19 min · ★ 7.3
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.
Directing: Mark Cendrowski · Writers: Steven Molaro, Jim Reynolds, Steve Holland
9x21 The Viewing Party Combustion
Apr 21, 2016 · 18 min · ★ 7.0
Everyone must choose sides when a small argument between Leonard and Sheldon erupts into a heated fight during a group get-together.
Directing: Mark Cendrowski · Writers: Steven Molaro, Tara Hernandez, Steve Holland · Starring: Kevin Sussman
9x22 The Fermentation Bifurcation
Apr 28, 2016 · 20 min · ★ 7.2
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.
Directing: Nikki Lorre · Writers: Tara Hernandez, Steve Holland, Chuck Lorre · Starring: Alessandra Torresani, Brian Thomas Smith
9x23 The Line Substitution Solution
May 5, 2016 · 18 min · ★ 7.1
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.
Directing: Anthony Rich · Writers: Steven Molaro, Maria Ferrari, Eric Kaplan · Starring: Kevin Sussman, Blake Anderson, Amanda Payton, Christine Baranski
9x24 The Convergence Convergence Season Finale
May 12, 2016 · 20 min · ★ 7.5
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.
Directing: Mark Cendrowski · Writers: Steve Holland, Chuck Lorre, Jeremy Howe · Starring: Laurie Metcalf, Judd Hirsch, Marcus Folmar, Christine Baranski