The Slayer and friends face their biggest challenge: college. Buffy tries to adjust to classes and living away from home, while keeping her identity secret. But it gets difficult when students start disappearing and she has to investigate. Riley: Marc Blucas. Kathy: Dagney Kerr. Eddie: Pedro Balmaceda. Buffy: Sarah Michelle Gellar. Oz: Seth Green. Willow: Alysson Hannigan.