Batman
Before Heath Ledger portrayed an iconic Joker in The Dark Night, that character was wholly owned by Jack Nicholson. His broad grin and sadistic gaze made for the scariest and most iconic villain in the Batman universe to date. In the movie, Nicholson starts out as a simple henchman until he falls into a barrel full of chemicals. Everyone thinks he is dead, but what comes out of the barrel is much worse than death: the Joker.