"The Wish" is the ninth episode of season 3 of Buffy the Vampire Slayer.
Following Xander and Willow's kiss in "Lovers Walk", Oz has called a time-out on his relationship with Willow and Cordelia is decidedly avoiding any contact with Xander. Cordelia returns to school only to be rejected by Harmony and her former clique, taunted as "Xander's castoff". Cordelia goes to the Bronze that night and Buffy accidentally humiliates Cordelia further by knocking her into a pile of trash in front of her friends while fighting a vampire. Cordelia decides that Buffy is to blame for her predicament, as she never would have dated Xander if his association with Buffy hadn't made him marginally cooler. The next day, Anya - a new girl who has been trying to befriend Cordelia - gives Cordelia an amulet while goading Cordelia into wishing that Buffy Summers had never come to Sunnydale. Anya immediately switches to demon form, that of Anyanka, and grants the wish.
Cordelia finds herself in a town overrun by the Master, where most of the student body are either dead or vampires and there is a nighttime curfew. Bright garments are avoided, because they attract vampires, and the lockers are festooned with garlic. Cordy finds that she is back in with her former group, but quickly loses her cool when she finds out that Willow and Xander are dead. Walking through the streets at night she meets Xander and Willow – now vampires. Cordy is saved by the "White Hats", a group of human vampire-fighters led by Giles and including Oz and Larry.
Cordelia tries to explain to Giles what happened and asks to have Buffy back so that things could be the way they were; but, before she can elaborate, she is killed by Xander and Willow, whom the Master had sent as assassins, fearing that Cordelia would summon the Slayer to Sunnydale. The Master is very pleased and Willow gains permission to play with the "Puppy" for a while. As she enters the cell and rolls the prisoner over, we see that the "Puppy" is Angel. She cheerfully begins torturing him with matches while Xander watches.
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Official Site: 20th Century Fox
Links: Wikipedia Entry: The Wish Buffy Guide.com Official Site