If aliens really looked like Jason Behr (say "Bear"), women everywhere would be building spaceship landing strips in their backyards. On the second season of Roswell (WB, Mondays 9 PM), Behr will be playing Max Evans, a handsome and compassionate half-extraterrestrial, half human. For Behr, its' a dream come true: The 26 year old has wanted to be an actor ever since he had a close encounter with the craft at age five. "I just knew it was what I was meant to do-even though being a sunflower in a play wasn't the most prestigious thing in the world!" says Behr, whose career really blasted off when he played a terminally ill teen in Buffy the Vampire Slayer and a jock on Dawson's creek. will Roswell's Max get back together with Liz? "I hope so,: he says. "I find it hard to believe that she could just walk away after everything they've experienced."