When Bruce Wayne was young he saw his parents killed right in front of his eyes since then he has been living with his butler alfred in the home of Wayne Manor in the city of Gotham Bruce also has a secret idenity. A dark Vigilante known as Batman who protects gotham from ruthless crimminals. When Jack Napier a nortorious crime boss is accidently disfigured by some acid he renames himself The Joker and plans to use some deadly laughing gas on Gotham City.