Overview
"Bad Eggs" is the twelfth episode of the second season of Buffy the Vampire Slayer. It was written by Marti Noxon and originally aired on The WB on January 12, 1998. Buffy must contend with vampire cowboys, the Gorch brothers and the bezoar, a prehistoric parasite.
Plot
Buffy and her mother Joyce are shopping at a mall when Buffy notices a vampire leading a girl into a closed arcade. Buffy fights off the vampire who is later found to be a semi-notorious vampire named Lyle who travels with his brother Tector.
At school the next day, Cordelia and Xander make out in a closet despite the fact they both continue to bicker and agree they do not want a relationship. In health class, the teacher, Mr. Whitmore asks the students to pair off to take care of an egg. That night, Buffy's egg breaks open and a tentacle emerges, attaching itself to her face and inserting a tendril into her ear.
From Wikipedia (CC BY-SA 4.0).