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The Big Bang Theory
S12.E23
All episodesAll
  • Cast & crew
  • User reviews
  • Trivia
IMDbPro

The Change Constant

  • Episode aired May 16, 2019
  • TV-PG
  • 19m
IMDb RATING
9.0/10
5.4K
YOUR RATING
Johnny Galecki and Jim Parsons in The Big Bang Theory (2007)
ComedyRomance

Sheldon and Amy await big news.Sheldon and Amy await big news.Sheldon and Amy await big news.

  • Director
    • Mark Cendrowski
  • Writers
    • Chuck Lorre
    • Bill Prady
    • Steve Holland
  • Stars
    • Johnny Galecki
    • Jim Parsons
    • Kaley Cuoco
  • See production info at IMDbPro
  • IMDb RATING
    9.0/10
    5.4K
    YOUR RATING
    • Director
      • Mark Cendrowski
    • Writers
      • Chuck Lorre
      • Bill Prady
      • Steve Holland
    • Stars
      • Johnny Galecki
      • Jim Parsons
      • Kaley Cuoco
    • 17User reviews
    • 5Critic reviews
  • See production info at IMDbPro
  • See production info at IMDbPro
  • Photos84

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    Top cast12

    Edit
    Johnny Galecki
    Johnny Galecki
    • Leonard Hofstadter
    Jim Parsons
    Jim Parsons
    • Sheldon Cooper
    Kaley Cuoco
    Kaley Cuoco
    • Penny Hofstadter
    Simon Helberg
    Simon Helberg
    • Howard Wolowitz
    Kunal Nayyar
    Kunal Nayyar
    • Raj Koothrappali
    Mayim Bialik
    Mayim Bialik
    • Amy Farrah Fowler
    Melissa Rauch
    Melissa Rauch
    • Bernadette Rostenkowski
    John Ross Bowie
    John Ross Bowie
    • Barry Kripke
    Blair Hickey
    Blair Hickey
    • Reporter #2
    Rodney J. Hobbs
    Rodney J. Hobbs
    • Reporter #3
    Joshua Malina
    Joshua Malina
    • President Siebert
    Dinora Walcott
    Dinora Walcott
    • Reporter #1
    • Director
      • Mark Cendrowski
    • Writers
      • Chuck Lorre
      • Bill Prady
      • Steve Holland
    • All cast & crew
    • Production, box office & more at IMDbPro

    User reviews17

    9.05.4K
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    Featured reviews

    10justin-fencsak

    A great conclusion to an epic comedy saga

    No show has ever made a big impact on pop culture than The Big Bang Theory. The two-part finale, which aired not too long ago, features laughter, sadness, and a few cameos. It's worthy of recording on your DVR.
    7baaspitter

    1st of all: Actually, Sweden is RIGHT!

    ... Only the Nobel Peace Prize is awarded in Oslo, Norway. The other ones in Stockholm, Sweden. I am so sorry the show is over, and I don't like Sheldon's speech. It's so cheesy, exactly what to expect from a US show, geez! Also, I did not like Leonard, needy, pathetic and whiny as he is. Amy's my princess, and I really live Sheldon. So sorry it's over. Loved that show.
    10johnarnheiter

    Actually...

    The Nobel Peace Prize is awarded in Norway, while the Nobel Prizes in Physics, Chemistry, Physiology or Medicine and Literature are awarded in Stockholm, Sweden.
    10thegreenarrow39

    Finally a good episode

    This season has been awful so far... very boring.. but i did enjoy the last episodes
    10burhan2366

    Greatest shows ends perfectly.

    Re-runs are inevitable- that's for sure. This 2 part finale ended so beautifully that I had tears in my eyes. Nobody can imagine a sitcom endes with such powerful emotional impact. Thank you once again Big Bang. Thank you for being part of my life.

    Storyline

    Edit

    Did you know

    Edit
    • Trivia
      The "Previously on the Big Bang Theory" segment includes clips from throughout the series showing important events or long-running jokes instead of the usual format of including relevant and more recent previous events that relate to the current episode. It begins with Penny meeting Leonard and Sheldon in the pilot. Also included are the weddings of the main characters. Funny elements include the habit of Sheldon to knock three times and the singing of the song Soft Kitty.
    • Goofs
      The DNA model falls apart as soon as Leonard touches it. In The Spock Resonance (2015) Sheldon moves the DNA model out of the way to get to the wall safe without any concern of it falling apart and it stays intact.
    • Quotes

      Amy Farrah Fowler: [after she hung up the phone, stunned] We won.

      Penny Hofstadter: Congratulations!

      Leonard Hofstadter: Oh, my god!

      Sheldon Cooper: We did it.

      Amy Farrah Fowler: I know. Can you believe it?

      Sheldon Cooper: That's a good point. What if I'm dreaming?

      [everyone gasps as Leonard slaps him, hard]

      Sheldon Cooper: [Realizing, screaming] WE WON THE NOBEL PRIZE!

      [They all start cheering, screaming, and hugging one another]

    • Crazy credits
      The penultimate vanity card simply reads:

      CHUCK LORRE PRODUCTIONS, #621

      Almost The End
    • Connections
      Featured in WatchMojo: Top 30 TV Moments We Waited Years to See (2025)
    • Soundtracks
      History of Everything
      (uncredited)

      Written by Barenaked Ladies

      Performed by Barenaked Ladies

      [Series theme song played during the opening titles]

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    Details

    Edit
    • Release date
      • May 16, 2019 (United States)
    • Country of origin
      • United States
    • Language
      • English
    • Filming locations
      • Stage 25, Warner Brothers Burbank Studios - 4000 Warner Boulevard, Burbank, California, USA(Studio)
    • Production companies
      • Chuck Lorre Productions
      • Warner Bros. Television
    • See more company credits at IMDbPro

    Tech specs

    Edit
    • Runtime
      19 minutes
    • Color
      • Color
    • Sound mix
      • Stereo
    • Aspect ratio
      • 16:9 HD

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