Season 12

On Tuesday, March 21, 2017, it was announced that The Big Bang Theory would be renewed for two more seasons after Season 10, which means there is a Season 11 and a Season 12. It was thought that Season 12 would be the last TBBT season, because of comments by the cast members. CBS confirmed that Season 12 is the last season. It premiered on Monday, September 24, 2018 and the season and series finale will air on Thursday, May 16, 2019.

Cast

 * Johnny Galecki as Leonard Hofstadter (21/24)
 * Jim Parsons as Sheldon Cooper (21/24)
 * Kaley Cuoco as Penny Hofstadter (21/24)
 * Simon Helberg as Howard Wolowitz (21/24)
 * Kunal Nayyar as Rajesh Koothrappali (21/24)
 * Mayim Bialik as Amy Farrah Fowler (21/24)
 * Melissa Rauch as Bernadette Rostenkowski-Wolowitz (21/24)
 * Kevin Sussman as Stuart Bloom (recurring/main cast) (9/24)





Trivia

 * Amy's parents returned to appear again this season after they attended Sheldon and Amy's Wedding. It has been confirmed they would appear in an episode this season. They appeared in the premiere episode. They reappeared on the eighth episode as well, in which contrasting with Sheldon bonding with Howard's father-in-law, Howard bonded with Sheldon's father-in-law.
 * Penny's father, Wyatt, reappeared in the third episode. He then reappeared in the fifteenth episode.
 * Amy and Sheldon started their first year as a married couple.
 * Some of the gang could be moving by year's end though that has not been confirmed.
 * Tam Nguyen had been confirmed to appear in an episode this season (episode four), and Sheldon revealed the reason he has not been throughout the first 11 seasons. He is played by Robert Wu.
 * Mary Cooper may return this season, but this has not been confirmed.
 * Sheldon and Amy's honeymoon was confirmed to be happening in the premiere episode.
 * On August 22, 2018, CBS announced that Season 12 was going to be the final season.
 * Neil deGrasse Tyson and Bill Nye both appeared in the premiere episode.
 * Last call for The Big Bang Theory! Jim Parsons pulled the plug after declining a 50 million dollar deal.
 * Bert Kibbler appeared in the second, sixth, and fourteenth episodes.
 * V. M. Koothrappali appeared in the second and twelfth episodes.
 * Denise appeared in the second, third, ninth, eleventh, and fourteenth episodes.
 * Sheldon and Amy honeymooned in New York and at LEGOLAND.
 * Stuart and Denise started dating in the second episode.
 * Leonard and Penny discussed having children in the third episode.
 * Bob Newhart returned in episode five as Professor Proton.
 * Jerry O'Connell returned as Sheldon's brother George Cooper Jr. in episode four.
 * President Siebert appeared in the fifth, seventh, eleventh, and thirteenth episodes.
 * This will be the final season. It's unknown how will they end it with the exception of the fact that the main characters will leave their apartments.
 * Chuck Lorre announced that two episodes will be airing as the series finale of the season.
 * Penny and Leonard Hofstadter decided not to have kids and will become a cool uncle and aunt to Howard and Bernadette children. But maybe they'll change their minds or have a surprise by season's end.
 * Barry Kripke reappeared in the seventh episode.
 * Raj was set up in an arranged marriage to a woman named Anu. They become engaged in the third episode, but stopped the wedding to date for awhile.
 * Raj and Anu had set their wedding date for Valentine's Day 2019, but it was called off in the "The Paintball Scattering". The couple decided to rekindle their romance in "The Propagation Proposition"
 * A crossover of sorts with Young Sheldon happened in December, as the younger versions of Sheldon (Iain Armitage), Georgie (Montana Jordan), and their father George Sr. (Lance Barber) guest starred in "The VCR Illumination".
 * Christine Baranski returned as Beverly Hofstadter in the tenth and seventeenth episodes.
 * Zack Johnson reappeared in the twelfth episode, along with his new wife Marissa. They wanted to have a baby, but needed a sperm donation since Zack was infertile. They reappeared again in the fifteenth episode.
 * The super asymmetry discovery is confirmed and will be submitted for a Nobel Prize per "The Confirmation Polarization", but Amy is being kicked off the team.
 * William Shatner made a guest appearance in the sixteenth episode.
 * Kareem Abdul-Jabbar was in the same episode as Shatner with a D&D theme.
 * Penny reveals her sister's name in the fifteenth episode, which is Lisa.
 * Leonard decided not to go through with the sperm donation for Zack.
 * Will Penny start on one of those smart and beautiful children that Leonard mentioned in the pilot episode?