Kryptonite. Even beyond Superman's colorful world of heroes and villains, the word has become synonymous with our ultimate weaknesses. This glowing green mineral spells certain death for the otherwise indestructible Man of Steel--but it's also the only tangible link he has to his homeworld.
But how did Superman discover the one thing that can harm him?
In this untold chapter from Superman's earliest days, a suave, savage crime lord makes his move on Metropolis, bringing wit ...