Fear, Itself 

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HOUSE OF HORRORS - Buffy (Sarah Michelle Gellar) reluctantly agrees to join Willow (Alyson Hannigan), Oz (Seth Green) and Xander (Nicholas Brendon) at a Halloween party where they stumble into a real-life house of horrors masquerading as an innocuous fraternity. Meanwhile, Giles (Anthony Stewart Head) is called upon to help out the college crowd when all he wants is to get into the spirit of the holiday.  Tucker Gates directed the episode written by David Fury.