I've had this ongoing daydream for years now about a sort of JL/Avengers type scenario of various different heroes and stuff from books/tv/movies/games being heroic together, all of course with much setup to their own characters and stories, they don't immediately just become a team for reasons. Going much further into actual details would be rather embarrassing but not a day goes by that I don't think of it, going back and forth between story arcs and threads in my head, replaying or adding/editing them and stuff.