Season 4

Season 4 of The Big Bang Theory returned to television on September 23rd, 2010 and contained 24 episodes.

Cast

 * Johnny Galecki as Leonard Hofstadter
 * Jim Parsons as Sheldon Cooper
 * Kaley Cuoco as Penny
 * Simon Helberg as Howard Wolowitz
 * Kunal Nayyar as Rajesh Koothrappali
 * Melissa Rauch as Bernadette Rostenkowski
 * Mayim Bialik as Amy Farrah Fowler

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