The Big Bang Theory is an American television sitcom. The show premiered on CBS on September 24, 2007. In March 2017, the series was renewed for two additional seasons, bringing its total to twelve, and running through the 2018–19 television season. The eleventh season premiered on September 25, 2017.
Actors and Actresses of the series The Big Bang Before and After 2018 (The Big Bang television series).
Actors in English of The Big Bang Then and Now are :

1- Janine – Regina King

2013 – 2018

2- Mary – Laurie Metcalf

2007 – 2018

3- Ramona – Riki Lindhome

2008 – 2018