SUPERMAN KRYPTONITE NEVERMORE HCEveryone knows Supermans major weakness: Kryptonite. But what happens when thats taken off the board, as a scientific experiment turns all the kryptonite on Earth to iron? Originally published in 1971, this story turned the Man of Steels status quo on its head. When all Kryptonite has been destroyed, the Man of Steel is anything but invulnerable as his powers slowly begin to fade and a doppelganger Superman arrives on the scene with strange powers of