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, the end of Leonard's long-distance relationship with Priya, Leonard and Penny experimenting in dating again, and Sheldon officially becomes Amy's boyfriend.

Cast

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