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Doomsday
Most of you have heard of Doomsday, mainly because he is probably the only super villain to go head to head with Superman and beat him. One of the more defining qualities of Doomsday is that every time he dies he respawns having evolved past the last thing that killed him, this power made him slowly invulnerable over the course of centuries traveling the universe. Developed as a weapon in a facility by the scientist Bertron, he was tested out through many of his first deaths on the planet Krypton, giving him an immense natural hatred towards Kryptonians. During the Death of Superman storyline he actually killed Superman, although Superman delivered a killing blow against him simultaneously.
