Season 4

Season 4 of The Big Bang Theory returned to television on September 23rd, 2010 and contained 24 episodes. Throughout the season, both Sheldon and Howard become more involved in their girls/girlfriends and Penny realizes her true feelings for Leonard following their third season break-up.

Cast

 * Johnny Galecki as Leonard Hofstadter (24/24)
 * Jim Parsons as Sheldon Cooper (24/24)
 * Kaley Cuoco as Penny (22/24)
 * Simon Helberg as Howard Wolowitz (24/24)
 * Kunal Nayyar as Rajesh Koothrappali (24/24)
 * Mayim Bialik as Amy Farrah Fowler (15/24)
 * Melissa Rauch as Bernadette Rostenkowski (15/24)

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