The Donation Oscillation

February 7, 2019

67.4%

The Big Bang Theory - S12 - E15

Penny tries to seduce an abstaining Leonard to ruin his "donation" for her ex-boyfriend, Zack, and his wife, Marissa. Also, Wolowitz, Bernadette, Anu and Koothrappali turn Koothrappali's canceled bachelor party into a couple's trip.

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The Big Bang Theory: Season 12 - 24 Episode s

12x1 - The Conjugal Configuration
September 24, 2018
Sheldon and Amy's honeymoon runs aground in New York. Penny and Leonard discover they are uncomfortably similar to Amy's parents. Raj insults physicist Neil deGrasse Tyson and starts a Twitter war.
12x2 - The Wedding Gift Wormhole
September 27, 2018
Sheldon and Amy drive themselves crazy trying to figure out what 'perfect gift' Leonard and Penny gave them for their wedding. Raj decides he wants to settle down and asks his father to arrange a marriage for him.
12x3 - The Procreation Calculation
October 4, 2018
The Wolowitzes' life gets complicated when Stuart starts bringing his new girlfriend home. Also, Penny and Leonard talk about starting a family, while Raj explores an arranged marriage.
12x4 - The Tam Turbulence
October 11, 2018
When Sheldon won't tell anyone why he's never mentioned his childhood best friend, Leonard takes matters into his own hands. Bernadette and Penny take out Raj’s fiancée for dinner to get the skinny on her.
12x5 - The Planetarium Collision
October 18, 2018
When Amy doesn’t have time to work on super-asymmetry, Sheldon goes to great lengths to ensure she’s available to work with him even it if means accidentally sabotaging her career in the process. Raj doesn’t want Howard to join him in hosting a show at the planetarium.
12x6 - The Imitation Perturbation
October 25, 2018
When Howard dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny's Halloween party. Leonard is shocked that Penny doesn't remember their first kiss.
12x7 - The Grant Allocation Derivation
November 1, 2018
Leonard is caught between a rock and a hard place when he's responsible for distributing extra grant money. Bernadette turns the backyard playhouse into a hideaway from Howard and the kids.
12x8 - The Consummation Deviation
November 8, 2018
Sheldon tries to bond with Amy's father, but when Howard lures Mr. Fowler away with magic tricks, Sheldon has no choice but to bond with Mrs. Fowler. Raj and Anu try to get physical for the first time.
12x9 - The Citation Negation
November 15, 2018
Sheldon and Amy are devastated after learning from a Russian paper that Super Asymmetry has already been theorized and disproven. Meanwhile, ultra-competitive Bernadette asks Stuart’s girlfriend to teach her how to beat Howard in a popular video game.
12x10 - The VCR Illumination
December 6, 2018
Sheldon and Amy are still down about their theory being disproven, but a VHS tape from Sheldon’s past inspires him not to give up. Bernadette turns into a pageant mom when she tries to help Howard ace his Magic Castle audition.
12x11 - The Paintball Scattering
January 3, 2019
Penny and Leonard organize a paintball game that results in mayhem when Sheldon is jealous of Amy. Also, Raj catches Anu with her ex-boyfriend, and Stuart gets cold feet when Denise hints at the possibility of them living together.
12x12 - The Propagation Proposition
January 10, 2019
Penny runs into her ex-boyfriend, Zack, who invites her and Leonard to a dinner to meet his newlywed wife. After the dinner the newlywed couple make an odd proposition to Leonard, which makes Penny to freak out. Also, Raj attempts to mend things with his ex-fiancée, Anu.
12x13 - The Confirmation Polarization
January 17, 2019
Sheldon and Amy are thrilled when their super asymmetry theory is proven by two physicists, until they try to kick Amy off the Nobel nomination. Also, Bernadette gets one of her drugs approved at work and wants a reluctant Penny to head the sales team.
12x14 - The Meteorite Manifestation
January 31, 2019
Sheldon is thrilled to help Bernadette and Wolowitz navigate bureaucratic paperwork, until he discovers they are breaking the law. Also, Leonard is disappointed when his friends exclude him from a scientific project.
12x15 - The Donation Oscillation
February 7, 2019
Penny tries to seduce an abstaining Leonard to ruin his "donation" for her ex-boyfriend, Zack, and his wife, Marissa. Also, Wolowitz, Bernadette, Anu and Koothrappali turn Koothrappali's canceled bachelor party into a couple's trip.
12x16 - The D & D Vortex
February 21, 2019
The gang finds out Wil Wheaton hosts a celebrity Dungeons and Dragons game involving William Shatner, Joe Manganiello, Kareem Abdul-Jabbar and Kevin Smith. Deception and betrayal are the path to make it to the one open seat.
12x17 - The Conference Valuation
March 7, 2019
When Penny and Bernadette go to San Diego for a pharmaceutical sales convention, Wolowitz is in charge of the kids. Also, Sheldon finds a book on experimenting on kids, and the guys plus Amy make a day of it.
12x18 - The Laureate Accumulation
April 4, 2019
When competitors Pemberton and Campbell charm America on a publicity tour, Sheldon and Amy try to bring Nobel laureates Kip Thorne, George Smoot and Frances Arnold to their side. Also, Halley's fear of the dark causes opportunity and conflict at the Wolowitz home.
12x19 - The Inspiration Deprivation
April 18, 2019
The concept of what it would mean for women everywhere if Amy were to win a Nobel Prize causes Amy to have a meltdown. Also, Howard and Raj try to relive the good old days after Howard buys a scooter that looks like the one he had years ago.
12x20 - The Decision Reverberation
April 25, 2019
Raj is worried people won’t take him seriously in his own field after publishing a paper that suggests he may have discovered alien life. Also, Leonard wants to be the principal investigator on a plasma physics study.
12x21 - The Plagiarism Schism
May 2, 2019
Kripke has proof that Dr. Pemberton plagiarized his thesis in college, and Sheldon and Amy aren't sure if they should turn him in or not. Meanwhile, Howard learns that Bernadette wasn't the only waitress at the Cheesecake Factory who had a crush on him.
12x22 - The Maternal Conclusion
May 9, 2019
Leonard is pleasantly surprised when Beverly comes to visit and she's genuinely kind to him, until he finds out the real reason she's there. Also, Denise and Stuart overstay their welcome at the Wolowitz house.
12x23 - The Change Constant / The Stockholm Syndrome
May 16, 2019
Sheldon and Amy await big news. Meanwhile, Penny and Leonard have some big news of their own. Also, Howard and Bernadette face the stressful challenge of leaving their kids for the first time and Raj makes a new friend, as the gang travels together into an uncharted future.
12x24 - Unraveling the Mystery: A Big Bang Farewell
May 16, 2019
Johnny Galecki and Kaley Cuoco will lead fans on a trip down memory lane, sharing some of the best-kept backstage secrets and personal memories from the past 12 years.

12x1 - The Conjugal Configuration

12x2 - The Wedding Gift Wormhole

12x3 - The Procreation Calculation

12x4 - The Tam Turbulence

12x5 - The Planetarium Collision

12x6 - The Imitation Perturbation

12x7 - The Grant Allocation Derivation

12x8 - The Consummation Deviation

12x9 - The Citation Negation

12x10 - The VCR Illumination

12x11 - The Paintball Scattering

12x12 - The Propagation Proposition

12x13 - The Confirmation Polarization

12x14 - The Meteorite Manifestation

12x15 - The Donation Oscillation

12x16 - The D & D Vortex

12x17 - The Conference Valuation

12x18 - The Laureate Accumulation

12x19 - The Inspiration Deprivation

12x20 - The Decision Reverberation

12x21 - The Plagiarism Schism

12x22 - The Maternal Conclusion

12x23 - The Change Constant / The Stockholm Syndrome

12x24 - Unraveling the Mystery: A Big Bang Farewell

S0: Specials

S1: Season 1

S2: Season 2

S3: Season 3

S4: Season 4

S5: Season 5

S6: Season 6

S7: Season 7

S8: Season 8

S9: Season 9

S10: Season 10

S11: Season 11

S12: Season 12