The Big Bang Theory - Season 12 Episode 20
Watch TV Shows The Big Bang Theory HD Raj is worried people won’t take him seriously in his own field after publishing a paper that suggests he may have discovered alien life. Also, Leonard wants to be the principal investigator on a plasma physics study.
- Year: 2019
- Country: United States of America
- Genre: Comedy
- Studio: CBS
- Director: Chuck Lorre, Bill Prady
- Cast: Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Melissa Rauch