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It's finally here, isn't it? The moment we've both dreamed about! Oh, don't tell me you're gonna fall asleep before we finish. You have gotten old haven't you?
~ Joker to Batman describing their final fight as something epic.
The Joker is one of the main antagonists of Frank Miller's 1986 Batman: The Dark Knight Returns comic book miniseries, a posthumous antagonist on its 2002 sequel miniseries The Dark Knight Strikes Again and the main antagonist on the 2008 prequel series All-Star Batman & Robin, the Boy Wonder. Like in most incarnations, The Joker is a psychopathic mass murderer who is Batman's archenemy. Following Batman's retire, he gets confined to Arkham Asylum and is left in a catatonic state, but when Batman returns ten years later, he comes back as well for a final showdown with the Dark Knight.
He is also a major antagonist in the 2012-2013 animated film adaptation of The Dark Knight Returns. Essentially, The Joker serves as a minor character in Part 1 and later becomes the main antagonist in the first half of Part 2.
Well into his 60s, the Joker spent 10 years at Arkham Asylum in a near catatonic stupor. When news hit the wire that his arch-nemesis, Batman had come out of retirement, the Joker's conscious mind resurfaced and he decided that it was time for him to come out of retirement as well.
After he manipulated his naive and glory-hound psychiatrist into declaring him 'cured'- the doctor proclaimed that he was merely a victim of Batman's own psychosis, which is quite stupid as he killed tons of people in the past without batman's influence- the Joker murdered the guests at a talk show where his psychiatrist had intended to publicly reveal his 'recovery'. Afterward, Joker then broke into Selina Kyle's escort service and, after he brainwashed her with a kiss via his mind-control lipstick, proceeded to order her to bring one of her escorts, Crystal, and then brainwashed her offscreen (presumably via the same method as with Selina) to manipulate a senator into declaring nuclear war between the US and the USSR (presumably also having her wear the same mind-control lipstick to ensure that she got the senator to agree).
Afterwards, Joker then dressed Selina up as Wonder Woman, bound, beat, and gagged her as well as presumably raped her before he took hostages at a local carnival. After he tracked the Joker there, Batman engaged his foe in the hall of mirrors, where an extremely violent and brutal showdown-turned-fist fight erupted between the two. The Joker dropped a mirror on Batman and made his escape into the tunnel of love ride. Batman reappeared and engaged the Joker a second time in a far more violent fight, in which the Joker hysterically stabbed him in the stomach several times. Mid-stab, Batman instinctively broke the Joker's neck just enough to paralyze him.
As a group of innocents, after they thought that Batman murdered the Joker, screamed and fled, Batman confronted his opponent. Although the Joker eagerly egged Batman into finishing him off, Batman was unable to, much to his disappointment. Nevertheless, the Joker sneered at him, and arrogantly claimed that he won the fight - he made Batman lose control and 'kill' him, and the people of Gotham would condemn and hunt him because of it. The Joker then finally said: See you in Hell!, before, in a last act of revenge against his enemy, he was able to twist his neck just far enough to kill himself, committing suicide and framing his enemy for his own murder. After so many years of waging a seemingly eternal one-on-one war, Batman had finally won the fight against the Joker, but the Joker had won their argument.
After hearing wind of Batman's return, Joker was shocked out of his catatonic state and quickly reverted back to his sociopathic, manipulative, villainous, and sadistic personality. His genius personality resurfaced as well, being able to pretend he felt remorse for his actions and that he was a victim of Batman's own psychotic obsession, to this Joker replies "I thought I was Batman's psychotic obsession." Another thing that returned was a love for theatrics, murdering his psychiatrist and the entire audience in front of Gotham city during a televised talk show. It's interesting however how Joker killed his psychiatrist only after he spoke ill of Batman, it's probably because he felt only he could talk that way about his archenemy.
Joker went to incredible lengths to cause Batman pain and ruin his reputation this was including the lives of others and his own. To cause him pain he kidnapped, beat and presumably raped Selina Kyle. Near his final moments he displayed his usual lack of remorse, showing no mercy to any of his victims claiming "I never kept count" (of the people he killed) instead was arrogant and mocking, claiming he had won, as two civilians thought they saw Batman snap his neck when he just paralysed him. He later committed suicide as to destroy Batman's reputation, finally defeating his archenemy in death, although he was slightly disappointed that Batman didn't murder him outright when telling him to finish him.
The Joker's insanity resurfacing
The Joker kills his psychiatrist
The Joker at the amusement park with his henchmen
The Joker holding a woman hostage at gunpoint at the amusement park
The Joker seconds before committing suicide via snapping his neck
Contrary to what many people believe, this version of the Joker was actually the first one revealed to have killed Jason Todd before the mainstream version in the acclaimed Batman: A Death in the Family story arc, which was published two years after The Dark Knight Returns. The most notable differences between the two versions is that Todd's death in the first one is just considered canonical to Frank Miller's Dark Knight Universe and that Jason never resurrects as Red Hood in such continuity.
Despite the two different realities, however, the 2016 one-shot Dark Knight Returns: The Last Crusade reveals that Jason's death in Miller's continuity was nearly the same as in the mainstream continuity: beaten to death by the Joker's henchmen under his orders, yet the Joker didn't use any bomb nor he seemingly participated in the beating.
There's a rumor which says that Frank Miller originally intended to state in The Dark Knight Returns that the Joker actually raped Jason Todd before killing him but that DC Comics stepped in and forced Miller to take it out. However, this Joker has been hinted anyway in further works to be a rapist.
Ironically, the infamous series finale for the TV series Lost (which was one of Michael Emerson's prior roles), was earlier referenced by The Joker in Batman: Arkham City where Joker asked why it all ended in a church. Interestingly, in the prequel Batman: Arkham Origins, when dressed as Black Mask upon getting unsmasked by Batman, the Joker's white tuxedo seems to be a reference to his Frank Miller portrayal.
In a behind the scenes feature for the film, Michael Emerson stated that he modeled the Joker's voice on comedian Paul Lynde.
In the original comic, the Joker has Bartholomew Wolper killed by having his neck snapped by Bobby, but in the film, he breaks David Endochrine's coffee cup to slit Wolper's throat. The latter was most likely done to reference the version from Batman: Under the Red Hood, where the Joker breaks a water glass to slit the throat of one of Black Mask's henchmen to then kill all his remaining men except Black Mask himself and Ms. Li.