Duality in the Buffyverse
Xander: Hey, wait till you have an evil twin. See how you handle it.
Willow: I handled it fine.

Episodes to Watch:
Wish- Buffy season 3 episode 9
Doppelgangland - Buffy season 3 episode 16
The Replacement- Buffy season 5 episode 3
Intervention- Buffy season 5 episode 18
Normal Again- Buffy season 6 episode 17

Essays to Read:
“ 'Where’s the fun?': The Comic Apocalypse in “The Wish” by David
Kociemba. Found at: http://slayageonline.com/essays/slayage23/Kociemba.htm

"Going Through the Motions: Reading Simulacra in Buffy the Vampire
Slayer" by Bronwen Calvert. Found at: http://slayageonline.com/essays/slayage15/Calvert.htm

Peeling, Caitlin and Scanlon, Meaghan. “‘What’s More Real? a Sick Girl
in an Institution… or Some Kind of Supergirl?’: The Question of Madness
in ‘Normal Again,’ a Feminist Reading.” Paper presented at the Slayage
Conference on Buffy the Vampire Slayer, Nashville, May 2004. Found at:
http://www.alysa316.com/Buffyology/#pub_b