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Superman could rip a cyborg into tiny pieces and use its fingers as a toothpick, unless that cyborg is powered by kryptonite. Enter Metallo.
A human brain with a cyborg body and a kryptonite heart, he has super strength and agility and can absorb any mechanical or metal object and make it an extension of his exoskeleton.
The first incarnation was George Grant. Then came journalist John Corben, who doubled as a thief and murderer. He suffered an accident while running from the scene of a crime and his body was mangled because of it. A professor by the name of Vale took Corben's brain and put it into a robotic body with fleshlike skin. Terminator much?
Corben, or "Corben's brain in a robot with fake skin on it," got a job at the Daily Planet, tried to "get" with Lois Lane and then decided to try and kill Superman as a hobby. He created a kryptonite trap for Superman but accidentally put the wrong metal in his power supply. He died because of that. Superman escaped. Corben's brother Roger then decided to avenge his brother's death by going through the same process, since it worked out so well the first time.