Season 9 poster
24 episodes

The Big Bang Theory - Season 9

First aired Sep 21, 2015Season 9

Our two genius roommates, Leonard and Sheldon, and their friends are back once again (smarter, but no wiser). Last season, Sheldon went soul-searching (on a train, of course) and was prepared to make some substantial revisions on his Relationship Agreement with Amy, when everything changed. Leonard, meanwhile, was off to Vegas with Penny to finally tie the knot in the season finale. Howard finds himself alone with Bernadette after the sudden passing of his mother; while Raj is not only talking to women – he’s getting exclusive with Emily. Together, they will all learn that life is far more complicated outside of the lab as love and friendship never produce predictable results!

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Reviews

Community reviews for The Big Bang Theory, shown here with its season details.

C

ComputerBlue

6.0

**What this review might have sounded like had I written it 7 years ago.** The first few seasons are, for the most part, extremely fantastic, focused, funny, fresh, intelligent and even at times, brilliant. Most importantly, it offers something that separates it from the pack...Must see TV! **What this review sounds like now nearing the end of the shows run.** A once great show which slowly starts to diminish around season 4, unfortunately. By the 9th season it seems as though the pen and paper have been handed over to teenage fans of the show...Decent background noise. **To conclude.** This show was once incredible, and something fresh, even at times brilliant. I couldn't wait for each new episode. Now, I watch it when it becomes available on a streaming service, and, on rare occasion you get a great episode, but it's not worth devoting a weekly schedule and sitting through all the fan-fiction episodes and story lines to get to the good stuff. The show can still be enjoyable, without question, though I find it better suited as background noise while doing work instead of must see TV that you're excited to tune in as it airs each week. It's now just another average sitcom which has been dumbed down for the masses quite considerably. At this rate, the show will probably end with Penny having Sheldon's child to fulfill the most commonly seen teenage fan-fiction.

P

Peter McGinn

10.0

I did not start watching this sitcom until the show end3d, but I had the good fortune to watch the episodes of all 12 seasons in order. I don’t agree with another review I saw that said the show had slipped over time. Rather, it is a consistently great show, as all of Chuck Lorre’s efforts seem to be, sort of comedy’s answer to Aaron Sorkin’s dramas. Mind you, I had some minor issues with it. I really got tired of Sheldon’s attitude and antics, but that 2as counterbalanced by the slow and careful ways he also showed character growth. Similarly, all of the characters exhibited realistic growth in their attitudes and behavior. The writing was usually strong, even during the few shows that I would classify as clunkers— plots that didn’t work for me. I am impressed that the show never jumped the shark, but rather stayed true to itself. Some long running shows can’t resist doing it, such as when Happy Days changed the Fonz from a cool dude to a combo superhero/cartoon character who could do almost anything, it seemed. Funny, I have a friend who told me she couldn’t watch it due to the canned laugh track, so I was amused to learn there was no laugh track as the show was filmed in front of a live audience. Imagine that!

Episodes

The Matrimonial Momentum still

Episode 1

The Matrimonial Momentum

7.3
Sep 21, 201519 min67 votes

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.

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Episode 2

The Separation Oscillation

7.3
Sep 28, 201519 min59 votes

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.

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Episode 3

The Bachelor Party Corrosion

7.5
Oct 5, 201519 min59 votes

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.

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Episode 4

The 2003 Approximation

7.5
Oct 12, 201519 min59 votes

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.

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Episode 5

The Perspiration Implementation

7.1
Oct 19, 201519 min60 votes

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.

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Episode 6

The Helium Insufficiency

7.1
Oct 26, 201519 min59 votes

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.

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Episode 7

The Spock Resonance

7.7
Nov 5, 201519 min61 votes

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.

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Episode 8

The Mystery Date Observation

7.5
Nov 12, 201518 min61 votes

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.

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Episode 9

The Platonic Permutation

7.5
Nov 19, 201521 min58 votes

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.

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Episode 10

The Earworm Reverberation

7.9
Dec 10, 201521 min58 votes

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".

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Episode 11

The Opening Night Excitation

8.3
Dec 17, 201521 min65 votes

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.

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Episode 12

The Sales Call Sublimation

7.3
Jan 7, 201618 min60 votes

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.

The Empathy Optimization still

Episode 13

The Empathy Optimization

7.3
Jan 14, 201619 min58 votes

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 still

Episode 14

The Meemaw Materialization

7.2
Feb 4, 201619 min59 votes

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.

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Episode 15

The Valentino Submergence

7.3
Feb 11, 201620 min59 votes

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.

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Episode 16

The Positive Negative Reaction

7.4
Feb 18, 201619 min58 votes

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.

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Episode 17

The Celebration Experimentation

7.1
Feb 25, 201619 min57 votes

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

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Episode 18

The Application Deterioration

7.3
Mar 10, 201618 min52 votes

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.

The Solder Excursion Diversion still

Episode 19

The Solder Excursion Diversion

7.3
Mar 31, 201621 min56 votes

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.

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Episode 20

The Big Bear Precipitation

7.3
Apr 7, 201619 min53 votes

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.

The Viewing Party Combustion still

Episode 21

The Viewing Party Combustion

7.0
Apr 21, 201618 min57 votes

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

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Episode 22

The Fermentation Bifurcation

7.2
Apr 28, 201620 min59 votes

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.

The Line Substitution Solution still

Episode 23

The Line Substitution Solution

7.1
May 5, 201618 min55 votes

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.

The Convergence Convergence still

Episode 24

The Convergence Convergence

7.5
May 12, 201620 min56 votes

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.