Main cast: Jim Parsons as Sheldon Cooper, John Galecki as Leonard Hofstadter, Simon Helberg as Howard Wolowitz, Kunal Nayyar as Rajesh Koothrappali and Kaley Cuoco as Penny.
The Big Bang Theory Season 1 Poster
Johnny Galecki as Leonard Hofstadter and Kaley Cuoco as Penny
Jim Parsons as Sheldon Cooper in Season 4 with cats
Jim Parsons as Sheldon Cooper and Kunal Nayyar as Rajesh Koothrappali
The Main Cast