Though the Joker is one of DC’s most iconic villains, rewatching his live-action movie appearances highlights a handful of unpleasant truths. Long before the movies of the DCEU introduced a shared universe of DC characters, the Joker was a key part of the DC universe. As Batmans most iconic nemesis, the Joker has proved a major player in a number of the Dark Knights greatest adventures, and is a regular part of movie adaptations of the heros world.