The Big Bang Theory Season 9 Episodes

Find out where to watch Season 9 of The Big Bang Theory tonight
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Season 9 Episode Guide

Episode 1 - The Matrimonial Momentum

After driving to Vegas to get married, Penny struggles with Leonard’s confession, in the ninth season premiere.
Episode 2 - The Separation Oscillation

Leonard confronts the woman he kissed on the North Sea, while Sheldon tries to retaliate after his breakup with Amy, using Fun with Flags.
Episode 3 - The Bachelor Party Corrosion

The guys surprise Leonard with a belated bachelor party weekend; the girls force Penny to tell her family that she eloped with Leonard.
Episode 4 - The 2003 Approximation

When Sheldon learns of a change in his living arrangements, he decides to revert back to a simpler time before he met Leonard or Penny.
Episode 5 - The Perspiration Implementation

When the guys take fencing lessons from Barry Kripke, Sheldon finds himself in an awkward position when Kripke expresses interest in Amy.
Episode 6 - The Helium Insufficiency

In the midst of a nationwide helium shortage, Leonard and Sheldon buy helium on the black market in order to complete an experiment.
Episode 7 - The Spock Resonance

Leonard & Penny are shocked to learn that Sheldon had an engagement ring for Amy; Howard & Bernadette disagree over remodeling their home.
Episode 8 - The Mystery Date Observation

With Amy out on a date with a mystery man, Sheldon enlists the help of Howard and Raj to find a new girlfriend by posting online.
Episode 9 - The Platonic Permutation

Howard reluctantly agrees to volunteer at the soup kitchen; Sheldon and Amy spend Thanksgiving together as friends.
Episode 10 - The Earworm Reverberation

Sheldon has a revelation after desperately wrestling with a song stuck in his head; Amy invites Dave over for dinner.
Episode 11 - The Opening Night Excitation

After five years of dating, Sheldon and Amy spend their first night together; Bob Newhart returns as Sheldon’s Obi-Wan to advise him.
Episode 12 - The Sales Call Sublimination

Penny gets more than she bargained for when Leonard meets with a psychiatrist on her behalf; Stuart moves out of Howard & Bernadette’s home.
Episode 13 - The Empathy Optimization

After having to deal with Sheldon being sick, Leonard, Penny and the gang try to treat themselves to a Sheldon free weekend.
Episode 14 - The Meemaw Materialization

Sheldon’s thrilled when his Meemaw comes to visit, but his excitement quickly fades when she butts heads with Amy; Raj meets a new girl.
Episode 15 - The Valentino Submergence

Sheldon and Amy host a live episode of Fun with Flags for Valentine’s Day; Raj is torn between Emily and the new girl he met.
Episode 16 - The Positive Negative Reaction

When the gang finds out about Bernadette’s pregnancy, they celebrate by singing karaoke.
Episode 17 - The Celebration Experimentation

After nine years together, the gang finally celebrates Sheldon’s birthday with a few special guests, on the 200th episode.
Episode 18 - The Application Deterioration

Leonard, Sheldon, and Wolowitz run into problems when they file for a patent for their infinite persistence gyroscope.
Episode 19 - The Solder Excursion Diversion

Amy is shocked at a revelation from Sheldon after she buys him a new laptop. Raj sells out Leonard and Howard after they lie to their wives.
Episode 20 - The Big Bear Precipitation

Sheldon spills a secret of Leonard’s when they take a weekend cabin trip with Penny and Amy. Raj goes overboard with buying pregnancy gifts.
Episode 21 - The Viewing Party Combustion

When a small argument between Leonard and Sheldon erupts into a heated fight, everyone must take sides during a group get-together.
Episode 22 - The Fermentation Bifurcation

Sheldon and Bernadette hang out together while the rest of the gang go to a wine bar, where they run into Penny’s old boyfriend, Zack.
Episode 23 - The Line Substitution Solution

Penny struggles to bond with Leonard’s mother when she comes for a visit. Meanwhile, Sheldon hires Stuart to spend the day with Amy.
Episode 24 - The Convergence Convergence

Chaos ensues in the season nine finale when Leonard’s recently divorced parents and Sheldon’s devoutly religious mother come to town.


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