It was just another dark and stormy in Gotham City, and there wasn't a criminal on the street, ever since Harvey Dent was elected District Attorney of Gotham. He was able to do what Batman wasn't able to do. But all the peace on the streets were about to come to an end. There was a home break in the out skirts of Gotham, robbers had broke in and killed everyone in that house, except for one, the robbers had left scarred. The robbers had lit the house on fire to cover their tracks. When the police came to the scene of the crime, they had found the bodies of the murdered people but the police had never found the body of the other person. That was day when the mastermind Criminal "The Joker" was created. He was the man who's family was killed, had his house burned down and whose face was left scared, all of this and the help of one man got him into crime.
