John Corben was a small-time con man who was fatally injured in a car crash, but to his luck Professor Emmet Vale happened to pass by. Vale was an astronomer who had years before noticed Superman's star drive blaze through the skies. After years of searching, Vale had found the rocket's remains and taken the fragment of kryptonite lodged in it. He also decoded part of a message Jor-El left in the rocket and mistakenly believed Jor-El had hostile intentions. Vale repaired Corben, providing a robotic body powered primarily by the piece of kryptonite. After Vale told his story, Corben killed him and began a criminal career as Metallo.

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