The 200th episode of 'The Big Bang Theory' airs on CBS
'The Big Bang Theory' is an American TV sitcom that aired on CBS in 2007. The story revolves mainly around a group of 4 geeks - Sheldon, Leonard, Raj, Howard and waitress Penny. The 200th episode was released as a part of the 9th season and guest-starred Sara Gilbert as a physicist Leslie Winkle.