Title: The Big Bang Theory (season 11)
Content:  The eleventh season of the American television sitcom The Big Bang Theory premiered on CBS on Monday, September 25, 2017. It returned to its regular Thursday time slot on November 2, 2017, after Thursday Night Football on CBS ended. The season concluded on May 10, 2018. In March 2017, CBS renewed the series for two additional seasons, bringing its total to twelve, and running through the 2018–19 television season.
Title: The Big Bang Theory (season 11)
Content:  Like the previous three seasons, the first five episodes aired on Mondays due to CBS' contractual rights to air the Thursday Night Football games. After Thursday Night Football ended, the series returned to a Thursday schedule starting on November 2, 2017. Filming for the eleventh season began on August 15, 2017; it was also announced with the taping report that the premiere for the eleventh season would be titled "The Proposal Proposal". Before the season premiered, five episodes were filmed from August 15 to September 19, 2017. According to TV Guide, Steve Holland announced on September 22, 2017, that both Bob Newhart and Wil Wheaton would return this season after their absences during Season 10.
Title: List of The Big Bang Theory episodes
Content:  The Big Bang Theory is an American comedy television series created and executively produced by Chuck Lorre and Bill Prady for CBS. Like the name of the series itself (with the exception of the first episode "Pilot"), episode titles of The Big Bang Theory always start with "The" and resemble the name of a scientific principle, theory or experiment, whimsically referencing a plot point or quirk in that episode. The series premiered on September 24, 2007, and ended on May 16, 2019, with a total of 279 episodes over the course of 12 seasons. There is also an earlier pilot, that differs greatly from the series, that never aired on CBS.
Title: The Big Bang Theory (season 11)
Content: Johnny Galecki as Dr. Leonard Hofstadter ; Jim Parsons as Dr. Sheldon Cooper ; Kaley Cuoco as Penny ; Simon Helberg as Howard Wolowitz ; Kunal Nayyar as Dr. Rajesh "Raj" Koothrappali ; Mayim Bialik as Dr. Amy Farrah Fowler ; Melissa Rauch as Dr. Bernadette Rostenkowski-Wolowitz ; Kevin Sussman as Stuart Bloom 
Title: The Big Bang Theory (season 11)
Content: Laurie Metcalf as Mary Cooper ; Christine Baranski as Dr. Beverly Hofstadter ; Stephen Hawking as himself ; Regina King as Janine Davis ; Brian Posehn as Dr. "Bert" Bertram Kibbler ; Wil Wheaton as himself ; Bob Newhart as Dr. Arthur Jeffries/Professor Proton ; John Ross Bowie as Dr. Barry Kripke ; Dean Norris as Colonel Richard Williams ; Brian Thomas Smith as Zack Johnson ; Brian George as Dr. V. M. Koothrappali ; Pamela Adlon as Halley Wolowitz (voice only) ; Joshua Malina as President Siebert ; Lauren Lapkus as Denise 
Title: The Big Bang Theory (season 10)
Content:  The tenth season of the American sitcom The Big Bang Theory premiered on CBS Monday, September 19, 2016 and concluded on Thursday, May 11, 2017. It returned to its regular Thursday time slot on October 27, 2016, after Thursday Night Football on CBS. On March 12, 2014, The Big Bang Theory was renewed for an additional three years, extending it through the 2016–17 season for a total of ten seasons.
Title: List of The Big Bang Theory episodes
Content:  ; 9.36 ; 9.28 ; 9.61 ; 10.01 ; 9.76 ; 10.19 ; 10.80 ; 11.42 ; 11.81 ; 11.10 ; 10.89 ; 13.11 ; 10.94 ; 9.46 ; 9.76 ; 9.77 ; 10.13 ; 9.31 ; 9.25 ; 9.81 ; 12.96 ; 13.27 ; 12.52 ; 13.07 ; 13.47 ; 12.73 ; 12.79 ; 13.23 ; 14.13 ; 14.38 ; 15.58 ; 15.82 ; 14.99 ; 15.51 ; 16.26 ; 15.73 ; 16.32 ; 13.42 ; 13.39 ; 11.63 ; 13.73 ; 15.02 ; 14.78 ; 14.04 ; 13.05 ; 12.59 ; 12.57 ; 13.05 ; 13.04 ; 14.00 ; 13.11 ; 13.02 ; 12.03 ; 13.24 ; 
Title: The Big Bang Theory (season 12)
Content:  In March 2017, CBS renewed the series for two more seasons, bringing its total to twelve, and running through the 2018–19 television season. On August 22, 2018, CBS and Warner Bros. Television officially announced that the twelfth season would be the series' last. This stemmed from Jim Parsons' decision to leave the series at the end of season twelve if the show were to have been renewed for a thirteenth season. The series concluded with an hour-long finale consisting of two back-to-back episodes on May 16, 2019.
Title: The Big Bang Theory (season 1)
Content:  The first season of the American sitcom The Big Bang Theory was originally aired on CBS from September 24, 2007, to May 19, 2008, over 17 episodes. An unaired pilot also exists. The Season 1 DVD came without a gag reel and is, so far, the only Big Bang Theory DVD set not to have one. The reissued Blu-ray, was released July 10, 2012, and includes a gag reel that is exclusive to the set. The episodes on Blu-ray are all in remastered surround sound, whereas the DVD version had stereo. Two of the main cast, Sheldon and Leonard, are named after actor, director, and producer Sheldon Leonard. Johnny Galecki and Sara Gilbert both selected the episode "The Hamburger Postulate" as a Primetime Emmy Award submission for Outstanding Lead Actor in a Comedy Series and Outstanding Guest Actress in a Comedy Series, respectively, at the 60th Primetime Emmy Awards, but both ended up not receiving a nomination. Jim Parsons selected the episode "The Pancake Batter Anomaly" as a Primetime Emmy Award submission for Outstanding Lead Actor in a Comedy Series at the 60th Primetime Emmy Awards, but ended up not receiving a nomination.
Title: The Big Bang Theory (season 12)
Content:  The twelfth and final season of the American television sitcom The Big Bang Theory premiered on CBS on September 24, 2018. It returned to its regular Thursday time slot on September 27, 2018, and concluded on May 16, 2019.

Question: big bang theory season 11 how many episodes?
Answer: 14.
12.