First appearing in the debut issue of the comic book Batman, The Joker appeared as a fictional supervillain in 1940. DC Comics is responsible for publishing the comic, but the creators are Bill Finger, Bob Kane and Jerry Robinson. Both Kane and Robinson claim responsibility for creating the Joker as a character, so who should get the credit is a contentious issue. Finger as the writer is, however, acknowledged by both Robinson and Kane. Following his initial appearance in 1940, the idea was to kill him off in subsequent issues but the editors stepped in and kept him alive. Even today he is still considered to be an archenemy of Batman.
The Joker has appeared in more than just the comic book, also showing his face in a number of movies and TV shows. He is introduced in the comic books as a criminal mastermind with a very warped and sadistic sense of humour. Also portrayed as a psychopath when he first made an appearance. The Comics Code Authority was introduced in the 1950s and this forced the Joker’s creators to make him more of a goofy prankster with a much lighter personality. He did, however, return to his darker persona in the 70s. The Joker has been able to play a part in many of Batman’s defining storylines, thanks to his position as Batman’s nemesis. Examples of this are when he paralyses Barbara Gordon and when he murders Jason Todd, Batman’s ward and the second Robin.