Fiona and her mother search a school for Fiona’s missing father, with the mother insisting, “Your dad must still be alive.” Their search is interrupted by a pursuer shouting, “Stop right there!” and ordering them to “Leave the antibody behind.” Panic spreads—Fiona cries for her dad, someone complains, “My head hurts,” and the mother shouts, “Fiona, run!” They flee through corridors as voices demand the antibody and a stranger yells, “Keep running, will you?” The episode ends with someone calling “Cathy?”—a sudden, unresolved name that raises fresh danger and questions.