The Bezoar is an ancient parasite featured in the television series Buffy the Vampire Slayer.
The Bezoar produces several eggs that the students are assigned to take home and care for. The next day the students are sluggish. Buffy tries to warn Willow Rosenberg but it's too late. A creature has already hatched from her egg and attached itself to her back. Xander Harris boils his egg and finds a creature inside.
When Buffy attempts to dissect the creature, Cordelia Chase, who also has a parasite, knocks Xander out and Willow knocks out Buffy. They are stuffed into the closet as the possessed students move to the basement with tools.
Buffy and Xander wake up and make their way to the basement where they find a subterranean creature that is controlling the other students. Lyle and Tector Gorch show up to fight Buffy. But Tector is grabbed by a tentacle and eaten by the creature. Buffy is grabbed as well but she manages to destroy the Bezoar, scaring Lyle bad enough he runs away. when the Bezoar is destroyed, it no longer controls the other students.