Buffy the Vampire Slayer

Season 6, Episode 18

Episode Title: Entropy

Air Date: 2002-04-30

Overview:

Anya returns to Sunnydale, bent on vengeance on Xander for leaving her at the altar. She has reclaimed her vengeance demon abilities, but order to use them, she must get one of his frustratingly-forgiving friends to wish him harm.