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The Big Bang Theory — Season 9 Episode 18

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S09E18

The Application Deterioration

★ 7.3 10 Mar 16 18 menit

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.

Comedy

Episode

S09E01 21 Sep 15 ★ 7.3 19m The Matrimonial Momentum 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.
S09E02 28 Sep 15 ★ 7.3 19m The Separation Oscillation 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.
S09E03 5 Okt 15 ★ 7.5 19m The Bachelor Party Corrosion 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.
S09E04 12 Okt 15 ★ 7.6 19m The 2003 Approximation 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.
S09E05 19 Okt 15 ★ 7.1 19m The Perspiration Implementation 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.
S09E06 26 Okt 15 ★ 7.2 19m The Helium Insufficiency 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.
S09E07 5 Nov 15 ★ 7.7 19m The Spock Resonance 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.
S09E08 12 Nov 15 ★ 7.6 18m The Mystery Date Observation 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.
S09E09 19 Nov 15 ★ 7.6 21m The Platonic Permutation 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.
S09E10 10 Des 15 ★ 7.9 21m The Earworm Reverberation 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".
S09E11 17 Des 15 ★ 8.4 21m The Opening Night Excitation 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.
S09E12 7 Jan 16 ★ 7.4 18m The Sales Call Sublimation 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.
S09E13 14 Jan 16 ★ 7.3 19m The Empathy Optimization After having to deal with a sick Sheldon, Leonard, Penny and the gang try to treat themselves to a Sheldon-free weekend.
S09E14 4 Feb 16 ★ 7.3 19m The Meemaw Materialization 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.
S09E15 11 Feb 16 ★ 7.3 20m The Valentino Submergence 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.
S09E16 18 Feb 16 ★ 7.4 19m The Positive Negative Reaction 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.
S09E17 25 Feb 16 ★ 7.1 19m The Celebration Experimentation After more than nine years together, the gang finally celebrates Sheldon’s birthday, surprising him with a special guest.
S09E18 10 Mar 16 ★ 7.3 18m Sedang diputar The Application Deterioration 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.
S09E19 31 Mar 16 ★ 7.3 21m The Solder Excursion Diversion 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.
S09E20 7 Apr 16 ★ 7.4 19m The Big Bear Precipitation 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.
S09E21 21 Apr 16 ★ 7.1 18m The Viewing Party Combustion Everyone must choose sides when a small argument between Leonard and Sheldon erupts into a heated fight during a group get-together.
S09E22 28 Apr 16 ★ 7.3 20m The Fermentation Bifurcation 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.
S09E23 5 Mei 16 ★ 7.3 18m The Line Substitution Solution 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.
S09E24 12 Mei 16 ★ 7.6 20m The Convergence Convergence 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.