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Joyce (Kristine Sutherland) is out on a slayer patrol with Buffy (Sarah Michelle Gellar) when they come across the bodies of two dead children, both bearing wierd symbols on their hands. It is Giles' (Anthony Head) view that the children may have been murdered by students practicing the occult. Joyce becomes incensed by this idea, and, with the help of Mrs. Rosenberg -- Willow's (Alyson Hannigan) mom -- forms "MOO" or Mothers Opposed to the Occult. Soon, MOO confiscates Giles' library books and other Sunnydale students begin picking on classmates suspected of occult activity. Also, the ghosts of the two dead children appear to Joyce and insist on her avenging their murder. Meanwhile, Buffy and friends discover a demon that takes on the forms of two young children -- Hans and Greta Strauss -- whose deaths engender persecutorial insincts among humans who then seek out and kill the murderer.