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Has anyone noticed that Superman's top enemies are literally designed to be a mimic of him? All of their abilities make them equal to Superman:

Lex Luthor: Rich genius who wears armor that gives him strength and flight and uses Kryptonite to weaken Superman, thereby putting them at the same level.

General Zod: A Kryptonian with Superman's exact power set.

Doomsday: A Kryptonian monster designed to kill Superman.

Bizarro: A warped clone of Superman's, whose powers mimic his with some alterations.

Metallo: A cyborg with a Kryptonite heart that allows him to go toe-to-toe with Superman.