Inca Mummy Girl
Original air date: October 6, 1997
Xander falls in love with Ampata, a foreign exchange student, but she is none other than an ancient mummy who has come to life and must take the life of others to survive, which is what she did at the bus station when the real exchange student to be staying at Buffy's house arrived. Assuming Ampata is the exchange student she was expecting, Buffy takes her back to her house.
This is the episode that got me to start watching Buffy. The love story between Xander and Ampata was very sweet, yeah, ok she was a mummy but, hey in the buffyworld, anything can happen. But it was very sad when at the costume party, Willow watches Xander and Ampata dancing and wishes it was her dancing with him. But what she didn't know was that Oz had noticed her for the first time and fell in love.