The Big Bang Theory: Season 9

The Big Bang Theory: Season 9

Poster for The Big Bang Theory: Season 9

The sitcom is centered on five characters living in Pasadena, California: roommates Leonard Hofstadter and Sheldon Cooper; Penny, a waitress and aspiring actress who lives across the hall; and Leonard and Sheldon's equally geeky and socially awkward friends and co-workers, mechanical engineer Howard Wolowitz and astrophysicist Raj Koothrappali. The geekiness and intellect of the four guys is contrasted for comic effect with Penny's social skills and common sense.

2015Rating: TV-14United States of AmericaChuck Lorre Productions, Warner Bros. Television

Streaming (2 Providers)



The Big Bear Precipitation

Sheldon spills a secret of Leonard’s when the two take... More a weekend cabin trip with Penny and Amy. Also, when Koothrappali goes overboard with pregnancy gifts, Wolowitz and Bernadette must draw the line.


The Platonic Permutation

Sheldon and Amy try hanging out as friends when they... More 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.


The Mystery Date Observation

Sheldon, Wolowitz and Koothrappali post an online advertisement to find... More Sheldon a new girlfriend. Also, when Amy is coy with details about a guy she is dating, Penny and Bernadette decide to spy


The Spock Resonance

Wil Wheaton interviews Sheldon for a Star Trek documentary where... More 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.


The Helium Insufficiency

In the midst of a nation-wide helium shortage, Sheldon and... More 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.


The Perspiration Implementation

The guys take a fencing lesson from Barry Kripke and... More 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.


The 2003 Approximation

Sheldon learns of an impending change in his living arrangements... More 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.


The Bachelor Party Corrosion

The guys' science skills are put to the test when... More 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.


The Convergence Convergence

Chaos ensues when Leonard’s recently divorced parents, Alfred and Beverly,... More 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.


The Line Substitution Solution

Sheldon hires Stuart to spend the day with Amy when... More 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 Fermentation Bifurcation

The gang goes to a wine bar and runs into... More 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.


The Viewing Party Combustion

Everyone must choose sides when a small argument between Leonard... More and Sheldon erupts into a heated fight during a group get-together.


The Matrimonial Momentum

After driving to Vegas to get married, Penny struggles with... More Leonard’s confession that he kissed another girl. Also, Sheldon doesn't know how to act after Amy pushes pause on their relationship.


The Separation Oscillation

Leonard confronts the woman he kissed on the North Sea... More 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.


The Solder Excursion Diversion

Amy is shocked at a revelation from Sheldon after she... More 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.


The Application Deterioration

Leonard, Sheldon, and Wolowitz run into problems when they file... More 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.


The Celebration Experimentation

After more than nine years together, the gang finally celebrates... More Sheldon’s birthday, surprising him with a special guest.


The Positive Negative Reaction

When the gang finds out about Bernadette’s pregnancy, they celebrate... More 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.


The Valentino Submergence

Sheldon and Amy host a live Valentine's Day episode of... More 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.


The Meemaw Materialization

Meemaw meets Amy, but it isn't all roses. Meemaw seems... More 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 Empathy Optimization

After having to deal with a sick Sheldon, Leonard, Penny... More and the gang try to treat themselves to a Sheldon-free weekend.


The Sales Call Sublimation

Penny gets more than she bargained for when Leonard agrees... More 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.


The Opening Night Excitation

After more than five years of dating, Sheldon and Amy... More spend their first night together. Also, Leonard, Wolowitz, and Koothrappali must decide who will take their extra Star Wars movie ticket.


The Earworm Reverberation

Sheldon has a revelation when he realizes why a song... More 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".

The Big Bang Theory: Season 9 | Release Details

The Big Bang Theory: Season 9 is available to stream in New Zealand now on Netflix and Prime Video.