Big Bang Theory

The Big Bang Theory is an American sitcom created by Chuck Lorre and Bill Prady. It premiered on CBS on September 24, 2007.

The show is centered on five characters: roommates Leonard Hofstadter and Sheldon Cooper, two physicists who work at the California Institute of Technology; Penny, a blonde waitress and aspiring actress who lives across the hall; and Leonard and Sheldon's equally geeky and socially awkward friends and co-workers aerospace engineer Howard Wolowitz and astrophysicist Rajesh Koothrappali.

These actors have been credited in all episodes of the series:

Johnny Galeck as Leonard Hofstadter, Ph.D. – An experimental physicist, he shares an apartment with colleague and friend Sheldon Cooper.
Jim Parsons as Sheldon Cooper, Ph.D., Sc.D. – Earned a Ph.D. at 16, He exhibits a strict adherence to routine; a lack of understanding of irony and sarcasm
Kaley Cuoco as Penny –A blonde who lives across the hall from Sheldon and Leonard. She is pursuing a career in acting; waitress and occasional bartender.
Simon Helberg as Howard Wolowitz – He works as an aerospace engineer, lives with his mother. provides outrageous pick-up lines and fancies himself a ladies' man.
Kunal Nayyar as Rajesh Koothrappali--He is very shy around women and is physically unable to talk to them unless he drinks alcohol.