Episode 111 of "Buffy, the Vampire Slayer"
s06e11 Gone
Title: Gone
Original Air Date: 01/08/2002 on UPN
Director: David Fury
Writer: David Fury
Guest Stars: Elin Hampton (Co-Worker), Kelly Parver (Girl in Park), Jeffrey Jacquin (Meter Man), Dwight Bacquie (Security Guard), Lyndon Smith (Little Boy), Melina Webberley (Little Girl), Susan Ruttan (Doris Kroeger), Daniel Hagen (Frank [Social Services Supervisor])
Plot Outline:
Buffy and Dawn clear the house of magic items to help Willow and Buffy has a surprise visit from a social worker checking on Dawn's home life. The meeting doesn't go well and in a fit of rage afterwards, Buffy cuts off her hair. Meanwhile, the Geek Trio have built an invisibility ray and accidentally hit Buffy with it.