 In the Halloween night, Buffy is very depressed due to her non-corresponded feelings for Parker, and Willow, Oz and Xander convince her to go to a famous Halloween party in a fraternity with them to have some fun. Anya is also invited by Xander to join the group. However, while decorating the place previously, one of the hosts paints a magic symbol, the Mark of Gachnar, on the floor, awaking the Fear Demon Gachnar that is fed by fear, bringing panic and horror to the house.