The Big Bang Theory The Decision Reverberation (Season 12, Episode 20)
TV-PG
TV Episode | 19 min | Comedy, Romance

Primary photo for The Decision Reverberation

The Big Bang Theory

The Decision Reverberation (Season 12, Episode 20)

TV-PG

TV Episode | 19 min | Comedy, Romance

Koothrappali is worried people won't take him seriously in his own field after publishing a paper that suggests he may have discovered alien life. Leonard wants to be the principal investigator on a plasma physics study.

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Cast	+ Add Cast
12 cast members

Name	Known for
Johnny Galecki Leonard Hofstadter Leonard Hofstadter See fewer	The Big Bang Theory (2007)
Jim Parsons Sheldon Cooper Sheldon Cooper See fewer	The Big Bang Theory (2007)
Kaley Cuoco Penny Hofstadter Penny Hofstadter See fewer	The Big Bang Theory (2007)
Simon Helberg Howard Wolowitz Howard Wolowitz See fewer	Florence Foster Jenkins (2016)
Kunal Nayyar Raj Koothrappali Raj Koothrappali See fewer	The Big Bang Theory (2007)
Mayim Bialik Amy Farrah Fowler Amy Farrah Fowler See fewer	Beaches (1988)
Melissa Rauch Bernadette Rostenkowski Bernadette Rostenkowski See fewer	The Big Bang Theory (2007)
Joshua Malina President Siebert President Siebert See fewer	In the Line of Fire (1993)
Rati Gupta Anu Anu See fewer	The Big Bang Theory (2007)
Dave Theune Dr. Graybel (as David Theune) Dr. Graybel (as David Theune) See fewer	I Am Not Okay with This (2020)
Angela Lin Maritza Maritza See fewer	Paradise (I) (2025)
Elijah Cook Terry (as Elijah Isaiah Cook) Terry (as Elijah Isaiah Cook) See fewer	The Diplomat (II) (2023)