The Big Bang Theory (also abbreviated as TBBT) is an American sitcom created by Chuck Lorre and Bill Prady, both of whom serve as executive producers on the show along with Steven Molaro. All three also serve as head writers. The show premiered on CBS on September 24, 2007. The ninth season premiered on September 21, 2015.
The fourth season of the American sitcom The Big Bang Theory, began airing on CBS on September 23, 2010. During the season, actress Kaley Cuoco was absent from two episodes after she fell off a horse and the horse accidentally crushed her leg. When she returned to the series, she was shown working as a bartender instead of waitressing at her usual workplace, The Cheesecake Factory, to hide her injury. In January 2011, The Big Bang Theory was renewed for an additional three years; extending it through the 2013/14 season, for a fifth, sixth, and seventh season. Season four starts four months after the end of season 3.