Superman beat Goku in that one death battle.
One time Batman beat Superman.
So Batman could be Goku, right?
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I don't think that logic plays well when doing these hypotheticals. Just because one guy beat the other does it mean he could beat every other thing. But, here, Batman would still win. Though he wouldn't have to even throw a punch. Goku is a moron. Batman s a genius. He trick Goku into flying into a black hoe or something and be done with it.