When Cordelia's date for the May Queen pageant is savagely beaten
Buffy and the gang discover that a missing pupil, Marcie Ross, (Clea
Duvall) might be responsible.
Strangely, even though
Marcie's copy of the school yearbook has messages from Xander and
Willow, no-one remembers her. In fact Marcie has been rendered
invisible, and driven insane with jealousy, by a combination of
people's indifference and energy from the Hellmouth.
Marcie ruins Cordelia's
moment of glory at the pageant, culminating with Cordelia and Buffy
being captured and threatened with mutilation: "I'm going to give
you a face no-one will ever forget!" Buffy manages to overpower
Marcie, who is led away by FBI agents and put into a class for invisible
assassins.