Top 20 TV Shows Everyone Should Watch at Least Once

If you haven't seen these TV shows at least once, you might want to get on that. For this list, we’ll be looking at scripted and narrative programs that are universally agreed to be essential viewing. If you haven’t seen all of these great stories, watch out for minor spoilers ahead. Our countdown includes “Avatar: The Last Airbender” (2005-08), “The Office” (2005-13), “The Twilight Zone” (1959-64), “The Sopranos” (1999-2007), and more! Have you missed out on any of these shows? Let us know in the comments below!