Doomsday wasn't created by Kryptonians. Pretty sure they hadn't even evolved yet. He was just tested on Krypton during its Age of Dinosaurs.
heres what his wika entry says says
Doomsday was born in prehistoric times on
Krypton, long before the humanoid Kryptonian race gained dominance over the planet about 250,000 years ago. It was a violent, hellish world where only the absolute strongest of creatures could survive.
[4][5] In a cruel experiment involving evolution, intended to create the perfect living being, the alien scientist Bertron released a humanoid infant (born
in vitro in a lab) onto the surface of the planet, where he was promptly killed by the harsh environment. The baby's remains were collected and used to
clone a stronger version. This process was repeated over and over for decades as a form of accelerated natural evolution. The agony of these repeated deaths was
recorded in his genes, driving the creature to hate all life.
As it evolved, the child eventually became able to survive the high temperatures and searing atmosphere, only to be quickly slain by the vicious predators that inhabited the planet. Over time, and without the assistance of Bertron's technology, he gained the ability to thrive on
solar energy without the need for food or air, to return to life and adapt in order to overcome whatever had previously killed him. The Ultimate hunted and exterminated the dangerous predators of Krypton. He then killed Bertron himself, whom he had come to identify as an enemy.
[4]
The Ultimate escaped Krypton via a ship that regularly arrived to deliver supplies to Bertron (who had wanted little contact with the planet's natives) and went on a killing spree across several planets. It began 245,000 years earlier on
Bylan 5, where
Darkseid was about to wed a princess (in order to obtain that planet's chemical deposits for
Apokolips's weapons factories). The Ultimate murdered Darkseid's ally Master Mayhem almost instantly but just as the Ultimate and Darkseid were about to meet in combat, Darkseid was forced to flee, as the rampage of the Ultimate had caused the planet's atmosphere to become toxic, thereby rendering the chemicals worthless to Apokolips. The Ultimate 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 they hoped would 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.
He next crossed paths with a
Green Lantern named Zharan Pel who was beaten to death. The Ultimate took the Lantern's
power ring and, sensing the power of the
Guardians of the Universe, headed towards them. The Thousands of Green Lanterns that were sent to stop him were slaughtered. He continued to
Oa, where a single Guardian fought him, wary of the others joining the fight, fearing the Ultimate would absorb their powers as he believed was happening to his powers, so as a last resort sacrificed himself in battle to defeat him. The release of energies by the Guardian caused a tear in space through which the Ultimate fell.
Eventually arriving on the planet Calaton, he ravaged that world for three years.
[4] With only the capital city left, the royal family combined their life forces into a single energy being, the Radiant.
[4][6] The Radiant killed the Ultimate with a huge blast of energy (laying waste to over a fifth of his planet in the process). In common Calatonian burial procedures, the Ultimate's seemingly dead body was suited and shackled to prevent his spirit from escaping into the afterlife, and he was shot into space because the murders he committed made him unworthy of burial on Calaton. Eventually, his metallic casket crashed on Earth, the force of the impact driving it deep underground.
Also why ll I don't think its mentioned in this articul I did read from somewhere that its believed that Doomsday killing so many prediters on Krypton is what allowed Kryptonians to evolve
edit how did you get your post done so fast on a cellphone when mins all copy and past?
