Season 5



The Big Bang Theory returned to television with Season 5 in September 2011. The season ended in May 2012. In this season, Amy Farrah Fowler and Bernadette Rostenkowski become main characters.

The season is mainly focused on Howard and Bernadette's wedding, Leonard having trouble in his long-distance relationship with Priya and eventually ending things with her, Leonard and Penny experimenting in dating again, and Sheldon officially  becomes Amy's boyfriend.

Cast
Principal Cast
 * In order of character appearances
 * Johnny Galecki as Leonard Hofstadter (24/24)
 * Jim Parsons as Sheldon Cooper (24/24)
 * Simon Helberg as Howard Wolowitz (24/24)
 * Kunal Nayyar as Rajesh Koothrappali (24/24)
 * Kaley Cuoco as Penny (24/24)
 * Melissa Rauch as Bernadette Rostenkowski (22/24)
 * Mayim Bialik as Amy Farrah Fowler (21/24)

Regular Cast
 * In order of character appearances
 * Carol Ann Susi as Mrs. Wolowitz (8/24)
 * Kevin Sussman as Stuart (7/24)
 * Alice Amter as Mrs. Koothrappali (3/24)
 * Brian George as V. M. Koothrappali (3/24)
 * John Ross Bowie as Barry Kripke (3/24)
 * Aarti Mann as Priya Koothrappali (2/24)
 * Wil Wheaton as Himself (2/24)
 * Joshua Malina as President Siebert (2/24)
 * Casey Sander as Mr. Rostenkowski (2/24)
 * Laurie Metcalf as Mary Cooper (1/24)
 * Vernee Watson-Johnson as Althea (1/24)