The eighth season of the American television sitcom The Big Bang Theory aired on CBS from September 22, 2014 to May 7, 2015. The series returned to its regular Thursday night time slot on October 30, 2014, beginning with the eighth season's seventh episode. On March 12, 2014, The Big Bang Theory was renewed for an additional three years, extending it through the 2016–17 television season for a tot... Wikipedia