While on a field trip to the local museum, one of the students breaks a ceramic seal in the coffin of an Incan mummy, who rises and must consume the life-force of others in order to remain alive. She tries to fit in with the students at Sunnydale, and even starts to have real feelings for Xander. But when Buffy, Willow, and Giles realize who and what she really is, they may have to rescue Xander before he becomes the mummy's next victim.