Welcome to IGN Unfiltered, our monthly interview series where we sit down with the best, brightest, and most fascinating minds in the video game industry. (Catch up on the other 50-plus episodes here.) My guest this month is Brian Raffel, cofounder of Raven Software, makers of this year's Call of Duty: Black Ops Cold War campaign plus a legion of other beloved games such as Star Wars Jedi Knight 2: Jedi Outcast, X-Men Origins: Wolverine, Star Trek Voyager: Elite Force, Marvel Ultimate Alliance, Heretic, Hexen, and more.