Out of Mind, Out of Sight
Original air date: May 19, 1997
When an invisible person starts attacking students, Buffy and the gang find out that the attacks are caused by Marcie, a girl who was ignored at school that she became invisible, and Cordelia is the girl's main target.
This episode is also known by the title of "Invisible Girl."
Character Study: Cordelia
Although Cordelia is always only thinking of herself. In this episode, it is one of the first times where she admits that although she is popular, she feels just as alone as the unpopular kids, even though she won't show it later. At the end of the episode, when her friends see her standing by Buffy and the gang, she quickly turns away and goes off with the popular crowd.