Joker/Earth-One

The Joker is a fictional comic book supervillain and the arch-nemesis of the Batman. The character is featured in Batman related comic book titles published by DC Comics and first appeared in Batman #1 in 1940. This version of the character, who belongs to the continuity of Earth-One, is generally regarded as the Silver Age version of the Joker. This particular iteration of the character was removed from continuity following the events of the 1985-1986 comic book maxi-series event, Crisis on Infinite Earths.