'Buffy the Vampire Slayer' Prom Episode Turns 25! Watch Sarah Michelle Gellar On Set (Flashback)

Sarah Michelle Gellar, Alyson Hannigan and Seth Green chatted with ET on set of the ‘Buffy the Vampire Slayer’ episode, 'The Prom,' in 1999. Sarah reacts to missing her own high school prom to attend the 1995 Daytime Emmy Awards and getting to wear two designer gowns in the episode. Plus, Seth Green jokes that he wore a dress to prom, which he calls a 'point of high controversy.'