The Cosby Show is an American television sitcom co-created by and starring Bill Cosby, which aired Thursday nights for eight seasons on NBC between September 20, 1984, until April 30, 1992. The show focuses on an upper middle-class African-American family living in Brooklyn, New York. The Cosby Show spent five consecutive seasons as the number-one rated show on television. The Cosby Show and All in the Family are the only sitcoms in the history of the Nielsen ratings to be the number-one show for five seasons. It spent all eight of its seasons in the top 20.