The study group is left to fend for themselves by Dean Pelton during a rabies outbreak due to tainted food at Greendale's Halloween party.
Pierce and a few other Greendale students ingest a biohazard substance at the school Halloween Party, causing them to exhibit flu-like symptoms and begin turning into zombies. It is up to the rest of the gang to save themselves and the school when Dean Pelton locks them in with the zombie-infected student body.—NBC Publicity