Although one of Superman's most well-known and powerful enemies, Bizarro actually first appeared as an adversary for Superboy. The original Bizarro was created during a lab accident, when a scientist was showing off his latest invention for Superboy, a form of duplicating ray, which could manifest a physical copy of anything that came in contact with its beam. When the scientist accidentally knocked over his new device, it hit the visiting Superboy, inadvertently creating an imperfect copy of the Boy of Steel. This creature, dubbed "Bizarro", was a chalk-white and craggy-skinned version of Kal-El, who could only speak in broken English and had limited intelligence. The scientist insisted the duplicate was not a living being, but it nevertheless escaped from his lab on its own.
The Bizarro creature had no ill intentions, but his strange appearance and odd behavior frightened the locals of Smallville, mostly because he had no real concept of how to use his own super powers. In an echo of Mary Shelley's FRANKENSTEIN, the creature then made friends with a young blind girl. But not long after, Superboy discovered that the remains of the machine that created Bizarro weakened him, much as Kryptonite would for a Kryptonian. Bizarro then lunged at Superboy, who was holding the machine's remains, somehow having intuited that the resulting shockwave from his destruction would cure his young friend's blindness.
Years later, when Superboy had become Superman, a second Bizarro creature was created by his arch nemesis Lex Luthor, who recreated the original duplicating ray and used it on Superman, with the hopes he could use the duplicate version to attack the Man of Steel. Similar to the original Bizarro in appearance, this version also spoke in "opposite speak," using phrasing such as "Me hate you" meaning "Me love you," and always referred to himself as "Me" instead of "I," resulting in phrases like "Me am not Superman, me am Bizarro!" Unfortunately for Luthor, this Bizarro did not bow to his wishes, and instead attempted to emulate Superman rather than destroy him. Sadly, all of his attempts to copy Superman's feats of heroism were thwarted by his own limited intelligence, and he often did more harm than good.
Being an imperfect copy of Superman, he fell in love with Lois Lane the moment he saw her, and subsequently kidnapped her to force her to marry him. But it was actually Lois who found a way to defeat Bizarro, when she created a Bizarro-Lois for him using the duplication ray. Seeing themselves as rejected by the people of Earth for the strangeness, the Bizarro couple then moved to the world of Htrae (Earth backwards), which had ancient advanced technology, which Bizarro used to populate the planet with other identical creatures. This Bizarro world was even square and not round.
The original Bizarro now referred to himself as "Bizarro #1", and Lois Bizarro was also deemed #1. The rest of the planet was filled with millions of duplicate versions of themselves, and eventually Bizarro versions of the Justice League and Supergirl. The Lois and Clark Bizarros even had a pair of super Bizarro children. At one point, Bizarro travelled to the future to join the Legion of Super-Heroes as Superman once did, but was rejected, so he created his own Bizarro Legion.
For much of the Silver Age, Bizarro was less of a villain, and more of a misunderstood nuisance. But that all changed during the 1970s, as Bizarro would become less sympathetic, and more of a malevolent menace. During this era, Bizarro's powers actually changed when he was struck by a meteor, and now he actually had the opposite powers of Superman, such as ice vision instead of heat vision, flame breath, microscopic vision that actually enlarges things, and so on. Bizarro once again tried to kidnap Lois Lane, but instead of just being an annoyance to Superman, he now wanted to eliminate his "perfect" counterpart once and for all. Superman saved Lois, but there was now a real animosity between the original and the duplicate.
It was during this time that Bizarro became a fully-fledged criminal, and even joined the Secret Society of Super-Villains. This iteration of Bizarro lasted through the end of the Bronze Age. He came to a tragic end before the events of the universe altering Crisis on Infinite Earths, when Bizarro was driven mad by another once of Superman's foes, the imp from the 5th dimension, Mister Mxyzptlk. Under his control, Bizarro #1 destroys his own Bizarro World, and ultimately commits suicide, bringing his sad story to a close.
After the continuity of the DC universe was rebooted following the events of the CRISIS ON INFINITE EARTHS, a new version of Bizarro emerged. Lex Luthor, now a billionaire with endless resources and his company LexCorp at his disposal, orders scientist Doctor Teng to create a clone of Superman. At this time, it was believed Superman was just a metahuman and not an alien, so not taking into account the alien DNA, this clone was very flawed from inception. Luthor orders the imperfect copy to be destroyed, but it survived. This Bizarro had an even more limited intelligence than the original, but also had vague remembrances of Clark Kent's life, based on a kind of genetic memory, and tried to mimic the Man of Steel by wearing Clark Kent's clothes over his Superman uniform.
Based on remnants of Clark's memories, Bizarro kidnaps Lois Lane. Superman is not only afraid that he will harm Lois and others, but he will inadvertently expose his secret identity as Clark Kent. Bizarro is destroyed when colliding with Superman in mid-air, crumbling to dust. When Lois Lane's sister Lucy, who had recently been blinded in a terrorist attack, is exposed to Bizarro's remains, she regains her sight, in an homage to the original version of Bizarro from the Silver Age.
Years later, Luthor recreated Bizarro in an effort to study him, hoping that his DNA might yield an answer on how to stop a so-called "clone plague" that was engulfing Metropolis. As before, this Bizarro escaped captivity, and once again kidnapped Lois Lane. He took Lois to his "Bizarro World", which was not an actual planet, but instead a warehouse set up like a twisted and strange version of the Metropolis in Superman's memory. Using his twisted logic, he subjected her Lois to actual danger, all so that he would then be able to also rescue her from it. Lois managed to escape, and Bizarro was recaptured by Lexcorp, where he eventually died.
The post-CRISIS era Bizarro that most resembled the original Silver Age version was created by another famous DC villain, the Joker. During the “Emperor Joker” storyline, the Clown Prince of Crime gains the limitless powers of Mr. Mxyzptlk, and used them to recreate the world in his own warped version of reality. One of these creations was a new Bizarro, who closely resembled the classic version of the character. The Joker even created a square Earth for Bizarro and his duplicates to live on, just as he had in the pre-Crisis universe. After the Joker was defeated and stripped of his godlike powers, this new Bizarro remained however, and was the hero of his own twisted world.
With the DC Universe's history rebooted once again due to the events of Flashpoint, a new version of Bizarro once again emerged. Lex Luthor had begun creating an army of Superman clones to use to eventually fight the Man of Steel, but the cloning process was complicated and slow. During 2013's FOREVER EVIL storyline, which saw the Crime Syndicate, the evil doppelgangers of the Justice League from Earth-3, invade our reality and defeat the League, Lex Luthor awakened one of his clones too early in an effort to fight the Syndicate.
However, since this clone, which was designated B-0, had not yet fully matured and was released prematurely, he was dim witted and slow, but still possessed all of Superman's powers. Unlike previous Bizarros, this version did not have the ability to even speak. In a deviation from past Bizarros, this version was actually like something of a beloved pet to Lex Luthor. When Bizarro died fighting the Crime Syndicate, Lex becomes enraged and vows to bring down the other dimensional villains and avenge his creation.
After the events of 2016's DC UNIVERSE REBIRTH #1, another clone of B-0 is found within a cryo-tube, inside a train car stolen by the Batman villain Black Mask. The hero known as the Red Hood, along with the Amazon named Artemis, attempt to steal the living weapon from Black Mask, not even realizing it's a clone of Superman. After being freed, this new Bizarro eventually joins Red Hood's team, the Outlaws.
In an echo of what happened to other past Bizarro clones, he is eventually stricken with a disease which cause his cells to rapidly deteriorate, and after saving his new friends the Outlaws, he dies. Lex Luthor, having affection for Bizarro, takes his body in order to bring him back to life. But he only does so on the condition that this Bizarro is the property of LexCorp. This latest Bizarro is actually extremely smart, to the shock of nearly everyone.