A weapon crafted in the most extreme conditions imaginable, Doomsday is an ultimate and unstoppable force of destruction and devastation.
One of the most intelligent beings in the universe, the wicked Brainiac's genius has challenged Superman time and again.
Superman’s nemesis Lex Luthor may be the smartest criminal mind on Earth, but his intellect is no match for the alien artificial intelligence known as Brainiac. Nevertheless, Brainiac shares Luthor’s intense hatred of the Man of Steel, and has continued to use his Twelfth-Level intellect over the years to bring down the Last Son of Krypton.
Though he's not the most intelligent of Superman's foes, what Bizarro lacks in brains he makes up for in brawn—as both villain and antihero.