Anderson wanted to make the creatures as "real" as possible Ð which meant keeping the computer-generated effects to a minimum and using the considerable talents of Creature Creators and Designers Alec Gillis and Tom Woodruff, Jr. and Visual Effects Supervisor John Bruno, who shared AndersonÕs vision of "less is more" when it comes to CG. Approximately 70 percent of the ALIEN VS. PREDATOR effects are physical and not CG. "TodayÕs audiences are sophisticated and can sense the sometimes ÔunrealnessÕ of even the best CG," says Anderson. "We wanted audiences to accept that these two powerful creatures are going head to head. And the best way to do that was for real."