Buffy the Vampire Slayer: 6x18
Entropy
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.
6 - 1Bargaining (1) Oct. 02, 2001
6 - 2Bargaining (2) Oct. 02, 2001
6 - 3After Life Oct. 09, 2001
6 - 4Flooded Oct. 16, 2001
6 - 5Life Serial Oct. 23, 2001
6 - 6All the Way Oct. 30, 2001
6 - 7Once More, with Feeling Nov. 06, 2001
6 - 8Tabula Rasa Nov. 13, 2001
6 - 9Smashed Nov. 20, 2001
6 - 10Wrecked Nov. 27, 2001
6 - 11Gone Jan. 08, 2002
6 - 12Doublemeat Palace Jan. 29, 2002
6 - 13Dead Things Feb. 05, 2002
6 - 14Older and Far Away Feb. 12, 2002
6 - 15As You Were Feb. 26, 2002
6 - 16Hell's Bells Mar. 05, 2002
6 - 17Normal Again Mar. 12, 2002
6 - 18Entropy Apr. 30, 2002
6 - 19Seeing Red May. 07, 2002
6 - 20Villains May. 14, 2002
6 - 21Two to Go May. 21, 2002
6 - 22Grave May. 21, 2002