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Eventually, his metallic casket crashed on Earth, the force of the impact driving it deep underground. In common Calatonian burial procedures, the Ultimate's seemingly-dead body was suited and shackled 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.
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The Radiant killed the Ultimate with a huge blast of energy (laying waste to over a fifth of his planet in the process). With only the capital city left, the royal family combined their life forces into a single energy being, the Radiant. Eventually coming to the planet Calaton, he ravaged that world for three years. The release of energies by the Guardian caused a tear in space through which the Ultimate fell. He continued to Oa where a single Guardian sacrificed himself in battle to defeat him. Hundreds of Green Lanterns, sent to stop him, were slaughtered. The Ultimate took the Lantern's power ring and, sensing the power of the Guardians of the Universe, headed toward them. He next crossed paths with a Green Lantern named Zharan Pel. Once the rocket was in space, the Ultimate killed Kobald and the resulting explosion sent him hurling through space. 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. The Ultimate hitched a ride on an escaping shuttle, which crashed on Khundia. Just as the Ultimate and Darkseid were to meet in combat, Darkseid was forced to flee, as the rampage of The Ultimate had caused the planet's atmosphere to become toxic and therefore the chemicals worthless to Apokolips. 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). The Ultimate 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. He then killed Bertron himself, whom he had come to identify as an enemy, due to Bertron having "killed" him thousands upon thousands of times. "The Ultimate" hunted and exterminated the dangerous predators of Krypton. Eventually, he gained the ability to thrive on solar energy without the need for food or air, to return to life and adapt to overcome whatever had previously killed him, without the assistance of Bertron's technology. Evolving, the child later became able to survive the high temperatures and searing atmosphere, only to be quickly slain by the vicious predators that inhabited the planet. The agony of these repeated deaths was recorded in his genes, driving the creature to hate all life.
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The baby's remains were collected and used to clone a stronger version, a process repeated time after time as a form of accelerated artificial breeding. In a cruel experiment intended to create the perfect living being, the alien scientist Bertron decanted a humanoid infant (born in a lab in vitro) onto the surface of the planet - where he was promptly killed by the harsh environment. It was a violent, hellish world where only the absolute strongest of creatures could survive. Originally known as The Ultimate, he was born in prehistoric times on Krypton, long before the humanoid Kryptonian race had gained dominance over the planet about 250,000 years ago. He is a nearly mindless, berserk killing machine, with no feelings apart from unfocused hatred, murderous rage, and the sheer malicious joy of destruction. Doomsday is best known as Superman's murderer in the 1992 storyline, " The Death of Superman".
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