Dawn Summers scared up skepticism when she dropped into Buffy the Vampire Slayer last fall. As the kid sister Buffy never knew, Dawn only grew more confusing as her supernatural origins became known: She is the human embodiment of a "living energy" that opens other dimensions. We're still a little fuzzy on the details but wholeheartedly give credit to Michelle Trachtenberg for bringing an unweildy character to life. "I'm like a lightning rod for pain and hurt, and everyone around me suffers and dies," Dawn said in a recent episode. You know what? She sounded more like a realy adolescent than anyone on Dawson's Creek."