You know, this would never happen (at least on the big screen), but what if they had a Justice League/Avengers/League of Extraordinary Gentlemen... but with horror villains? What if there was something so bad out there that Freddy Kreuger, Jason Vorhees, Michael Myers, Pinhead, Candyman, Leatherface and whoever else were brought to try and stop it? Granted, since only half of them even speak, there might not be much in the way of dialog.
Well, it's not quite Justice League style, but you can get a taste of that here:
Just go to about 7:20 into the video.