Joker's Unofficial Superpower Could End the Entire DC Universe
Although he does not officially have any superpowers, the Joker has been shown to be able to turn essentially any other living thing into a version of himself. Video games, animated content, movies, and comics have all shown that the Joker is able to not just change the appearance of others with his signature Joker Venom, but can also change their minds to be just as comically sadistic as he is. With the ability to turn a seemingly unlimited amount of people into insane killers, the Joker represents one of the biggest threats not just to Batman, but to all of DC Comics.
Humans, demi-gods, kryptonians, and even animals have suffered the effects of Joker Venom. The Joker is seemingly able to create his venom from whatever chemicals are on hand, even crafting a variant from standard cleaning supplies in Batman: A Death in the Family by Jim Starlin and Jim Aparo. With the ability to create an infection for anything at any time, Joker Venom is almost more like a superpower than scientific knowledge.
Related: The Batman Honors Joker's Most Defining Trait (Despite Being So Different)
This power has been shown to have apocalyptic consequences, such as in the New 52's Batman: Endgame by Scott Snyder, Greg Capullo, Danny Miki, FCO Plascencia, and Steve Wands. In this story, the Joker infects the Justice League a month in advance, causing them to take on his violent sense of humor, bleached skin, and permanent smile. The team attacks Batman but easily could have laid waste to the rest of the world instead. This is followed by Gotham being infected by Joker Venom which causes people to have the same reaction but also makes them able to spread it to others like a virus. Quickly, the entire city becomes full of jokerized citizens, and
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