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The Big Bang Theory – Season 12, Episode 20: Full Cast & Crew Aired Apr 25, 2019 Comedy
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. TV-PG Air Date: Apr 25, 2019 See TV Episode Details

Cast & Crew

All Cast Crew
Johnny Galecki Leonard Hofstadter Actor Jim Parsons Sheldon Cooper Actor Kaley Cuoco Penny Actor Simon Helberg Howard Wolowitz Actor Kunal Nayyar Raj Koothrappali Actor Mayim Bialik Amy Farrah Fowler Actor Melissa Rauch Bernadette Rostenkowski Actor Joshua Malina President Siebert Guest Star Rati Gupta Anu Guest Star David Theune Dr. Graybel Guest Star Angela Lin Maritza Guest Star Elijah Isaiah Cook Terry Guest Star Chuck Lorre Executive Producer Bill Prady Executive Producer Steven Molaro Executive Producer, Writer Steve Holland Writer Tara Hernandez Writer Eric Kaplan Writer Maria Ferrari Writer Jeremy Howe Writer Mark Cendrowski Director