I am here to tell you about an old wiki that I am reviving, called When Worlds Collide. I guess you could call it a collabrative fanfiction in which every fictional universe crosses over. The wiki has more information on the story, of course.
As of this blog post, it has 16 pages, most of which were made and edited by me. Most of those pages are stubs, and I am calling anybody else who is interested to help fill them out.