Anthony D'Alessandro Editorial Director/Box Office EditorThe HBO limited series inspired by Alan Moore and Dave Gibbons’ DC graphic novel thrusts us into the 1921 Tulsa massacre, which is known as the single worst incident of racial violence in U.S history.It is the moment from which series creator Damon Lindelof builds his expansion of the Watchmen universe, in which we meet Angela Abar aka Sister Knight (limited series lead actress Emmy nominee Regina King), a former police officer turned