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even on earth, i contend vader wins. i should have written kryptonite is needed BY EARTHLINGS to defeat superman on earth. vader is no earthling.

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This is just wrong. Without kryptonite, Superman is impervious to everything. Superman not only kicks Darth's ass, but does so easily.

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hes impervious to any earthly object/person/substance. vader is none of those. vader will be at least as powerful as superman on earth. the force is vaders kicker, superman will have a kicker problem