The Joker is easily one of the most infamous, and well-know villains across any form of media, be it comics, film, television, or videogames. His first appearance was in Batman (April 25, 1940). Despite the Joker's characterization as a lunatic clown, he is actually a criminal mastermind, with a warped sense of humour, often responsible for everything from harmless pranks, to dark and sadistic crimes. Throughout his history as a character, he's had many different origin stories, as well as several different characterizations. Having just celebrated his 80th anniversary, the Joker is a timeless character, and a classic villain who will live on in infamy for years to come.