Batman: The Killing Joke

Plot
The plot revolves around a largely psychological battle between Batman and his longtime foe the Joker, who has escaped from Arkham Asylum. The Joker intends to drive Gotham City Police Commissioner James Gordon insane to prove that the most upstanding citizen is capable of going mad after having "one bad day". Along the way, the Joker has flashbacks to his early life, gradually explaining his possible origin.

The man who will become the Joker is an unnamed engineer who quits his job at a chemical company to become a stand-up comedian, only to fail miserably. Desperate to support his pregnant wife, Jeannie, he agrees to guide two criminals into the plant for a robbery. During the planning, the police inform him that his wife has died in a household accident involving an electric baby bottle heater. Grief-stricken, the engineer tries to withdraw from the plan, but the criminals strong-arm him into keeping his commitment to them.

At the plant, the criminals make him don a special mask to become the infamous Red Hood. Unknown to the engineer, this disguise is simply the criminals' scheme to implicate any accomplice as the mastermind to divert attention from themselves. Once inside, they almost immediately blunder into security personnel, and a violent shootout and chase ensues. The criminals are gunned down and the engineer finds himself confronted by Batman, who is investigating the disturbance.

Panicked, the engineer deliberately jumps into the chemical plant's toxic waste catch-basin vat to escape Batman and is swept through a pipe leading to the outside. Once outside, he discovers, to his horror, that the chemicals have permanently bleached his skin chalk white, stained his lips ruby red and dyed his hair bright green. This turn of events, compounding the man's misfortunes of that one day, drives him completely insane and results in the birth of the Joker.

In the present day, the Joker kidnaps Gordon, shoots and paralyzes his daughter Barbara, and imprisons him in a run-down amusement park. His henchmen then strip Gordon naked and cage him in the park's freak show. He chains Gordon to one of the park's rides and cruelly forces him to view giant pictures of his wounded daughter in various states of undress. Once Gordon completes the maddening gauntlet, the Joker ridicules him as an example of "the average man", a naïve weakling doomed to insanity.

Batman arrives to save Gordon, and the Joker retreats into the funhouse. Gordon's sanity is intact despite the ordeal and he insists that Batman capture the Joker "by the book" in order to "show him that our way works." Batman enters the funhouse and faces the Joker's traps while the Joker tries to persuade his old foe that the world is inherently insane and thus not worth fighting for. Eventually, Batman tracks down the Joker and subdues him. Batman then attempts to reach out to him to give up crime and put a stop to their years-long war; otherwise, the two will be eternally locked on a course that will one day result in a fight to the death between them. The Joker declines, however, ruefully saying "It's too late for that...far too late." He then tells Batman a joke that was started earlier in the comic. The joke is funny enough to make the normally stone-faced Batman laugh. They continue to laugh as the police approach. Batman then grabs the Joker and the story ends, leaving it up to the reader to determine the Joker's fate.

Influence in other media
Tim Burton claimed that The Killing Joke was a major influence on his film adaptation of Batman: "I was never a giant comic book fan, but I've always loved the image of Batman and The Joker. The reason I've never been a comic book fan - and I think it started when I was a child - is because I could never tell which box I was supposed to read. I don't know if it was dyslexia or whatever, but that's why I loved The Killing Joke, because for the first time I could tell which one to read. It's my favorite. It's the first comic I've ever loved. And the success of those graphic novels made our ideas more acceptable."[16]

Director Christopher Nolan has mentioned that The Killing Joke served as an influence for the version of the Joker that appeared in The Dark Knight. Heath Ledger, who played the Joker, stated in an interview that he was given a copy of The Killing Joke as reference for the role.[17] The most apparent influence of the graphic novel on the narrative itself would be the Joker's concept of his past as being "multiple choice" – in the film, he describes two conflicting scenarios to explain the origins of his scars to two different people - as well as his claim that a bad day could drive anyone mad, which he tries to prove through tormenting Gordon in the comic book, and Harvey Dent in the film. Both Jokers also explain their behavior and attitude as seeing what a twisted joke the world is, with the film stating in society "their morals, their code: it's a bad joke. Dropped at the first sign of trouble. They're only as good as the world allows them to be."

The design of the Joker in the video game Mortal Kombat versus DC Universe is based on The Killing Joke