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Season 1 - Mar. 10, 1997
Season 2 - Sep. 15, 1997
Season 3 - Sep. 29, 1998
Season 4 - Oct. 05, 1999
Season 5 - Sep. 26, 2000
Season 6 - Oct. 02, 2001
Season 7 - Sep. 24, 2002
Buffy the Vampire Slayer Season 1 Episode 11
HD
Overview:
When a seemingly evil invisible force centers around Cordelia, Buffy investigates and discovers that a student who was ignored by all her classmates, including Willow and Xander; became invisible by their perception of her and she plans revenge on Cordelia because of her popularity.