This Marvel (at least I think he is) Villain I can't remember the name of for the life of me

I remember my big bro watching what I at least am quite sure was X-Men when I was little, and there was this villain that always showed up, and I honestly don't remember who he was or what his deal was. I remember what he looked like, and that I think he was in one of the videogames.

Alright, so he was this big fat greenish gray dude with robot legs (think Spider Mastermind from Doom) and this ridiculously long nose and horrifying twisted smile. He has sunken buggy eyes and gross bluish hair and pimples/freckles/moles. I think maybe he was some sort of mastermind-type or something, I remember his base was very tech-y and gross-looking.

If he wasn't from X-Men, he's most likely from something Marvel (his design seems that way at least). Either that, or he might have been part of that Superman/Batman crossover thing DC did a while ago, I remember that had a bunch of weird villains (one of them had like, an oversized pimple on the side of his face which was another face or something).

Seriously, I vividly remember this guy, he was one of my biggest childhood fears. I just can't remember his fucking name. Anyone else know who I'm talking about? I hunted through a rather large gallery of X-Men villains and found nothing, so Idunno.