Doomsday

Doomsday is a monstrous being and experiment of the ambitious, as well as unethical scientist Bertron. He is also the only known being to have almost successfully killed Superman.

Origin
Doomsday is a fictional character, a supervillain that appears in comic books published by DC Comics.The character first appears in Superman: The Man of Steel #17 (Nov. 1992), and was created by writer-artist Dan Jurgens. Since 1992, Doomsday is the only supervillain to have successfully killed Superman, although Superman was later revealed to be in suspended animation. In 2009, Doomsday was ranked as IGN's 46th Greatest Comic Book Villain of All Time. Doomsday was created in the distant past on Krypton, long before the humanoid Kryptonian race had gained dominance over the planet. It was a violent, hellish world where only the absolute strongest of creatures could survive. At the time, the world's dominant life-forms were said to be the most dangerous creatures in the universe. In an effort to create the ultimate life-form, the alien scientist Bertron sent an infant who was born in a lab in vitro to the surface of the planet where it would be promptly killed by the harsh environment. Its remains were harvested and used to clone a stronger version of it, a process repeated countless times as a form of accelerated artificial breeding. The agony of these deaths were recorded in his genes, driving the creature to hate all life. Evolving, eventually the child was able to survive the hot temperature and rock landscape, only to be quickly killed by the savage creatures that inhabited the planet. Eventually, it gained the ability to return to life and adapt and overcome what killed it in its prior life without the need of Bertron's technology. "The Ultimate" as Bertron called him hunted and killed all of the dangerous creatures that then inhabited Krypton, including Bertron, whom he had come to identify as unfriendly, due to having been "killed" by him hundreds upon hundreds of times.

Doomsday escaped Krypton via a ship that regularly came to deliver supplies to Bertron - who wanted little contact with the planet's natives - and went on a killing spree across several planets. It began 245,000 years ago on Bylan 5, where Darkseid was about to wed a princess (in order to obtain that planet's chemical deposits for Apokolips' weapons factories). Just as Doomsday and Darkseid were to meet in combat, Darkseid was forced to flee, as the battle had caused the planet's atmosphere to become toxic and therefore worthless to Apokolips. Doomsday hitched a ride on an escaping shuttle, which crashed on Khundia. The warring Khundian clans united in order to build protective armor for a warrior named Kobald, who was hoped to survive long enough to force the Ultimate onto a rocket. Once the rocket was in space, the Ultimate killed Kobald and the resulting explosion sent him hurling through space.

Doomsday next came across the path of a Green Lantern named Zharan Pel. Doomsday took the Lantern's power ring and, sensing the power of the Guardians of the Universe, made his way to them. Hundreds of Green Lanterns were sent to stop it and were killed. It continued to Oa where a single Guardian sacrificed himself in battle to defeat it. But the release of energies by the Guardian caused a tear in space through which Doomsday fell. Eventually coming to Calaton, Doomsday tore that world apart for three years.[4] With only the capital city left, the royal family combined their life forces into a single energy being, The Radiant.The Radiant killed Doomsday with a huge blast of energy (laying waste to over a fifth of his planet in the process). In common Calatonian burial procedures, Doomsday seemingly-dead body was shackled and masked to prevent his spirit escaping into the afterlife, and he was shot into space due to his murders making him unworthy of burial on Calaton. Eventually, Doomsday landed on Earth, the force of the impact driving the casket deep underground.

Powers & Abilities

 *  Unique Physiology:  Doomsday was created through evolution by cloning, making him virtually impossible to be killed by whatever killed him the last time.
 * Invulnerability: Doomsday immune to the effects of virtually every physical and mental harm. This means bullets, rockets, bombs and even the power of Darkseid's omega beams are incapable of really killing him. He is also resistant to virtually every form of energy.
 * Immortality: Being created before the Kryptonian species, Doomsday is capable of living for centuries without any physical signs of aging. Even after he's died, he is also able to come back from death.
 * Superhuman Strength: Doomsday is extremely strong, capable of taking on the entire Justice League by himself and take on solar powered Kryptonians. He is even able to lift tons over his head with even more ease than that of a Kryptonian, with little to no effort.
 * Superhuman Speed: Surprisingly enough, despite his hulking size, Doomsday is capable of moving at amazing speeds.
 * Superhuman Stamina: Doomsday is able to remain in a straight up fight with beings like Solar powered Kryptonians for days and still able to go toe to toe with other beings of equal power.
 * Accelerated Healing: Should he sustain physical injury, Doomsday is able of regenerating any lost and damaged tissue.
 * Adaptation: Though Doomsday is virtually incapable of death, should he end up dying, he is able of coming back from death and is immune to whatever killed him the last time.
 * Superhuman Leap: Doomsday is incapable of flight, however because of his dense muscles and powerful legs, he is able of leaping great distances
 * Self-Sustenance: Doomsday has no need of nourishment, water or oxygen and is able to survive in environments normally lethal to other forms of life, including the vacuum of space. He also has no need of a yellow sun for his abilities, therefore he can maintain them in places such as the Phantom Zone.
 * Claws: Doomsday possesses extremely powerful and retractable claws, which he can extend to great lengths, as well as make them venomous.

Weaknesses

 * Entropy: Though Doomsday is able of adapting to virtually anything that killed him previously, entropy however is not one of them. This happens when he is sent to the ends of time and can be destroyed by the ends of the universe.
 * Metahumans: Not many metahumans are able to take him down alone, however enough of them are able of overpowering and possibly even killing him.
 * Single-Minded: Despite Doomsday's remarkable powers, he is however not very bright and is capable of being manipulated by someone much more intelligent than himself.