Show cover for The Big Bang Theory

The Best Episodes of The Big Bang Theory Season 9

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.
Genre:Comedy
Network:CBS

Season 9 Ratings Summary

"The Matrimonial Momentum" is the best rated episode of "The Big Bang Theory" season 9. It scored 6.8/10 based on 4011 votes. Directed by Mark Cendrowski and written by N/A, it aired on 9/21/2015. This episode is rated 0.5 points higher than the second-best, "The Separation Oscillation".

  • The Matrimonial Momentum
    6.8/104,011 votes

    #1 - The Matrimonial Momentum

    Season 9 Episode 1 - Aired 9/21/2015

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Separation Oscillation
    7.3/103,429 votes

    #2 - The Separation Oscillation

    Season 9 Episode 2 - Aired 9/28/2015

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Bachelor Party Corrosion
    7.7/103,497 votes

    #3 - The Bachelor Party Corrosion

    Season 9 Episode 3 - Aired 10/5/2015

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The 2003 Approximation
    7.4/103,295 votes

    #4 - The 2003 Approximation

    Season 9 Episode 4 - Aired 10/12/2015

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Perspiration Implementation
    7.4/103,218 votes

    #5 - The Perspiration Implementation

    Season 9 Episode 5 - Aired 10/19/2015

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Helium Insufficiency
    7.2/103,277 votes

    #6 - The Helium Insufficiency

    Season 9 Episode 6 - Aired 10/26/2015

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Spock Resonance
    7.9/103,384 votes

    #7 - The Spock Resonance

    Season 9 Episode 7 - Aired 11/5/2015

    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.

    Director: Nikki Lorre

    Writer: N/A

  • The Mystery Date Observation
    7.9/103,399 votes

    #8 - The Mystery Date Observation

    Season 9 Episode 8 - Aired 11/12/2015

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Platonic Permutation
    7.8/103,351 votes

    #9 - The Platonic Permutation

    Season 9 Episode 9 - Aired 11/19/2015

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Earworm Reverberation
    8.3/103,832 votes

    #10 - The Earworm Reverberation

    Season 9 Episode 10 - Aired 12/10/2015

    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".

    Director: Mark Cendrowski

    Writer: N/A

  • The Opening Night Excitation
    9.0/105,620 votes

    #11 - The Opening Night Excitation

    Season 9 Episode 11 - Aired 12/17/2015

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Sales Call Sublimation
    7.4/103,052 votes

    #12 - The Sales Call Sublimation

    Season 9 Episode 12 - Aired 1/7/2016

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Empathy Optimization
    7.4/103,075 votes

    #13 - The Empathy Optimization

    Season 9 Episode 13 - Aired 1/14/2016

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Meemaw Materialization
    7.5/103,119 votes

    #14 - The Meemaw Materialization

    Season 9 Episode 14 - Aired 2/4/2016

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Valentino Submergence
    7.5/103,064 votes

    #15 - The Valentino Submergence

    Season 9 Episode 15 - Aired 2/11/2016

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Positive Negative Reaction
    7.4/103,185 votes

    #16 - The Positive Negative Reaction

    Season 9 Episode 16 - Aired 2/18/2016

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Celebration Experimentation
    7.5/103,204 votes

    #17 - The Celebration Experimentation

    Season 9 Episode 17 - Aired 2/25/2016

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Application Deterioration
    7.5/103,001 votes

    #18 - The Application Deterioration

    Season 9 Episode 18 - Aired 3/10/2016

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Solder Excursion Diversion
    7.4/102,928 votes

    #19 - The Solder Excursion Diversion

    Season 9 Episode 19 - Aired 3/31/2016

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Big Bear Precipitation
    7.4/102,902 votes

    #20 - The Big Bear Precipitation

    Season 9 Episode 20 - Aired 4/7/2016

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Viewing Party Combustion
    7.4/102,901 votes

    #21 - The Viewing Party Combustion

    Season 9 Episode 21 - Aired 4/21/2016

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Fermentation Bifurcation
    7.4/102,837 votes

    #22 - The Fermentation Bifurcation

    Season 9 Episode 22 - Aired 4/28/2016

    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.

    Director: Nikki Lorre

    Writer: N/A

  • The Line Substitution Solution
    7.4/102,845 votes

    #23 - The Line Substitution Solution

    Season 9 Episode 23 - Aired 5/5/2016

    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.

    Director: Anthony Joseph Rich

    Writer: N/A

  • The Convergence Convergence
    7.8/103,218 votes

    #24 - The Convergence Convergence

    Season 9 Episode 24 - Aired 5/12/2016

    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.

    Director: Mark Cendrowski

    Writer: N/A