Willow, still heartbroken after Oz's departure, casts a spell to make her wishes come true. But she can't control it, so whatever she casually says becomes reality, causing Giles to go blind when she tells him he “can't see anything.” She also turns Xander into a “demon magnate.” Willow: Alyson Hannigan. Giles: Anthony Stewart Head. Buffy: Sarah Michelle Gellar.