The Big Bang Theory Season 9 Episode 21
The Big Bang Theory
Watch the big bang theory season 9 episode 21 online. Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
- Genre: Comedy
- Country: United States
- Director: Chuck Lorre, Bill Prady
- Cast: Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Melissa Rauch, Mayim Bialik,
