Many heroes have had evil versions of themselves turn up or just other versions of themselves. I'm talking about ones in continuity. Post and Pre Crisis and New Earth but not Elseworlds or other never been continuity books.
So who is it who's the Ultimate double, or the dastardliest doppelganger.
And just for fun Who's the worst.
For me it's a toss uo between Superboy Prime and Cyborg Superman for the the best.
And the worse has to be the original Crime Syndicate Owl Man. But the CSA Owlman is fantastic.
Top five then would be