Summary: Idea for a scary sparky fic, inspired from an old episode of Buffy. An illness affects the Athosians, which resembles the flu. Several members of the expedition are contaminated and it eventually infects Elizabeth too. Conventional treatment doesn’t seam to be working, and some of the infected die. When Carson starts making progress, he is attacked, and left unconscious. Meanwhile, all patients are terrified by a creature the uninfected can’t see. It turns out they are being killed off by an entity which feeds off their life source, making it look like they died from the flu. John gets himself infected so he can see it and fight it to save Elizabeth and the rest of the expedition. Any Halloween story would do, too.