Over the past decade, we've seen practically every major mainstream superhero make it to the screen in some form or other. Marvel's Spider-Man, X-Men, and various Avengers have all made it to the theaters, as have DC's Superman, Batman, and Green Lantern
. Hell, even the supposedly unfilmable Watchmen
got a faithful adaptation courtesy of Zack Snyder
. And yet one of the most beloved icons of the genre has been notably ...