Buffy clashes with her overbearing roommate, Kathy (Dagney Kerr), and, as the tension escalates, begins to have nightmares about having her soul sucked away, which leads her to believe there may be more to her roomie than meets the eye. Parker: Adam Kaufman. Buffy: Sarah Michelle Gellar. Willow: Alyson Hannigan. Xander: Nicholas Brendon.