"Inca Mummy Girl" is episode four of season two of the television series Buffy the Vampire Slayer, originally airing on The WB on October 6, 1997.
The episode was written by former series story editors Matt Kiene and Joe Reinkemeyer (penning their second and final script for the show) and directed by Ellen S. Pressman, inspired by the story of Momia Juanita, a real mummy discovered on the extinct volcano Ampato near Arequipa, Peru, in 1995.
To prepare for Sunnydale High's cultural exchange program, Buffy visits an Incan exhibit with her schoolmates.
The students learn that the mummy in the museum is one of a beautiful Incan princess, sacrificed by her people to save them from destruction.
When the Scoobies rush to the museum, cracking uneasy jokes, they encounter a sword-wielding guard and the remains of the missing student.
The 500-year-old becomes a beautiful teenager, and poses as "Ampata", the boy who was supposed to stay with Buffy (everyone simply assumes that the information was wrong on her sex).
Giles asks Ampata to decipher the seal from her tomb, and she explains (reluctantly) that it describes a girl chosen to die to save her people, and a bodyguard who will keep her from straying from that path.
The band playing at the dance is Dingoes Ate My Baby, and the lead guitarist, Oz, notices Willow in her Eskimo parka.
However, Ampata hesitates and weakens to the point of returning to her dead form; Buffy pulls her off Xander and she instantly breaks into pieces on the floor.
The site InsectReflection.com discusses the similarities between two Chosen Ones, specifically with Buffy's choice to sacrifice herself for the sake of others in "Prophecy Girl", while Ampata chooses to live and make others pay that price.
The show is savvy enough to complicate this metaphor, because the people who sacrificed the Inca Mummy Girl were indeed monstrously unfair, and submitting to her fate will indeed ruin her life.