Wow. I can't believe this...
I'm a law student myself. And even though codes, legislations and judge criteria may vary from one country to another (and I'm neither American nor living in the USA), from what I understand, he is making two points:
* To remove his stuff (from posts to personal creations). Since this site doesn't host any files, I guess the elimination of his posts will suffice. And it's already been done.
* To contact Marvel and DC. This seems threatening, but it only depends on the companies' attitude towards the subject. On one hand, I find it hard to believe that Marvel and DC don't know about Freedom Force and its community. Okay, we're not big, but back in the day, FF was probably the first successful superhero videogame. And this problem has been mentioned to death since then, without any major repercussions, as far as I recall. Both companies aren't unfamiliar with Modding, and big selling games have been modded too (think X-Men Legends/Marvel: Ultimate Alliance) without any serious legal problem. Those sites are still up and running -I know that those games are Marvel related and this one isn't, and that's quite a difference, but I digress-.
On the other hand, as Cat said, Marvel has a history of avoiding copyright infringements. But I don't think they have closed down sites related to videogames in recent times. They do have demanded the elimination of torrent links containing their comics, but that's a different matter altogether and their position is quite logical and understandable.
Many thanks to the admins for their hard work. Hopefully this will be solved real soon. Let's keep this community together: don't let the vindictiveness of one individual hurt us as a whole. I believe that, in spite of this turmoil, we will end up still standing, somehow - either here or in another site, we'll see.