The Big Bang Theory

The Best Episodes of The Big Bang Theory Season 9

Genre:Comedy
Network:CBS

Every episode of The Big Bang Theory Season 9 ranked from best to worst. Discover the Best Episodes of The Big Bang Theory Season 9!

Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
Episodes
24
Avg. Rating
7.6
S1
S2
S3
S4
E1
E2
E3

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  1. 9.0/10(5.7k votes)

    #1 - The Opening Night Excitation

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    S9:E11

    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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    Writer:N/A
  2. 8.3/10(3.9k votes)

    #2 - The Earworm Reverberation

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    S9:E10

    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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    Writer:N/A
  3. 7.9/10(3.5k votes)

    #3 - The Spock Resonance

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    S9:E7

    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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    Director:Nikki Lorre
    Writer:N/A
  4. 7.9/10(3.5k votes)

    #4 - The Mystery Date Observation

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    S9:E8

    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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    Writer:N/A
  5. 7.8/10(3.5k votes)

    #5 - The Platonic Permutation

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    S9:E9

    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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    Writer:N/A
  6. 7.8/10(3.3k votes)

    #6 - The Convergence Convergence

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    S9:E24

    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.

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    Writer:N/A
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  8. 7.7/10(3.6k votes)

    #7 - The Bachelor Party Corrosion

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    S9:E3

    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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    Writer:N/A
  9. 7.5/10(3.2k votes)

    #8 - The Meemaw Materialization

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    S9:E14

    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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    Writer:N/A
  10. 7.5/10(3.2k votes)

    #9 - The Valentino Submergence

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    S9:E15

    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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    Writer:N/A
  11. 7.5/10(3.3k votes)

    #10 - The Celebration Experimentation

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    S9:E17

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

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    Writer:N/A
  12. 7.5/10(3.1k votes)

    #11 - The Application Deterioration

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    S9:E18

    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.

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    Writer:N/A
  13. 7.4/10(3.4k votes)

    #12 - The 2003 Approximation

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    S9:E4

    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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  14. 7.4/10(3.3k votes)

    #13 - The Perspiration Implementation

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    S9:E5

    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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  15. 7.4/10(3.1k votes)

    #14 - The Sales Call Sublimation

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    S9:E12

    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.

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    Writer:N/A
  16. 7.4/10(3.2k votes)

    #15 - The Empathy Optimization

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    S9:E13

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

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  17. 7.4/10(3.3k votes)

    #16 - The Positive Negative Reaction

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    S9:E16

    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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    Writer:N/A
  18. 7.4/10(3.0k votes)

    #17 - The Solder Excursion Diversion

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    S9:E19

    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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  19. 7.4/10(3.0k votes)

    #18 - The Big Bear Precipitation

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    S9:E20

    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.

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    Writer:N/A
  20. 7.4/10(3.0k votes)

    #19 - The Viewing Party Combustion

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    S9:E21

    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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  21. 7.4/10(2.9k votes)

    #20 - The Fermentation Bifurcation

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    S9:E22

    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.

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    Director:Nikki Lorre
    Writer:N/A
  22. 7.4/10(2.9k votes)

    #21 - The Line Substitution Solution

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    S9:E23

    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.

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    Writer:N/A
  23. 7.3/10(3.5k votes)

    #22 - The Separation Oscillation

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    S9:E2

    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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  24. 7.2/10(3.4k votes)

    #23 - The Helium Insufficiency

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    S9:E6

    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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  25. 6.8/10(4.1k votes)

    #24 - The Matrimonial Momentum

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    S9:E1

    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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    Writer:N/A

Season 9 Ratings Summary

"The Opening Night Excitation" is the best rated episode of "The Big Bang Theory" season 9. It scored 9/10 based on 5741 votes. Directed by Mark Cendrowski and written by N/A, it aired on 12/17/2015. This episode is rated 0.7 points higher than the second-best, "The Earworm Reverberation".