The Big Bang Theory/The Change Constant

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The Change Constant
Season 12, Episode 23
Airdate May 16, 2019
Production Number T12.16023
Written by Chuck Lorre &
Steve Holland &
Steven Molaro &
Bill Prady &
Dave Goetsch &
Eric Kaplan &
Maria Ferrari &
Andy Gordon &
Anthony Del Broccolo
& Tara Hernandez &
Jeremy Howe &
Adam Faberman
Directed by Mark Cendrowski
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The Big Bang TheorySeason Twelve
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The Change Constant is the twenty-third episode of the twelfth season of The Big Bang Theory, and the two hundred seventy-eighth episode overall.

Starring: Johnny Galecki (Dr. Leonard Hofstadter), Jim Parsons (Dr. Sheldon Cooper), Kaley Cuoco (Penny Hofstadter), Simon Helberg (Howard Wolowitz), Kunal Nayyar (Dr. Rajesh "Raj" Koothrappali), Mayim Bialik (Dr. Amy Farrah Fowler), Melissa Rauch (Dr. Bernadette Rostenkowski-Wolowitz)

Guest Starring: Joshua Malina (President Siebert), John Ross Bowie (Barry Kripke), Blair Hickey (Reporter #2)

Co-Starring: Dinora Walcott (Reporter #1), Rodney J. Hobbs (Reporter #3)


Plot Overview


Arc Advancement





The Show

Behind the Scenes

Allusions and References

Memorable Moments