LogFAQs > #931950737

Kevin is a kid who
A) Has to know that kryptonite is the only way to effectively neutralize superman
B) Has to know where to find kryptonite on earth, of which there is a limited amount
C) Has to know how to utilize said limited amount of kryptonite in the most effective way, and even that might not be enough if there's not a lot of kryptonite.

Being, you know, a kid, I think it's reasonable to assume he has one of those capabilities right off the bat, no points for guessing which one correctly. Given infinite time, it's possible he eventually finds all the available kryptonite, but that might not be possible given I imagine some if not all of it is heavily locked down and being a kid, he'd have no way to know or learn how to get past any safeguard. Even if, against all expectation, he devised some means to adequately handle many supermen, the supermen could just suicide bomb him and gradually unveil all the traps he prepared until there were no more. And if the traps aren't kryptonite based as there is a limited supply of kryptonite, then the trapped supermen by those traps won't even be trapped permanently, so there is essentially a near infinite amount of supermen with which to spring traps.

1 million supermen
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I'm a greener egg than the eggs from dr. seuss