One of my favorite things to do when I write SF is to screw around with genre expectation. And there is one that is almost never messed with that was too fun not to try to deal with, and that is the Parasite.
In SF, whenever people are infested by an evil parasite-like creature determined to enslave them, body and mind, it is always a hideous, nasty thing. Or it’s invisible. By contrast, on the rare occasions (like STNG’s the Trill, say) that a symbiote is beneficial, it is always invisible. For whatever reason, we’re wired to believe — or maybe it’s just that we really, really want to believe — that beauty is truth and truth is beauty. It might have something to do with the fact that beautiful people are usually healthy ones, and breeding with the healthy only makes good evolutionary sense. But there’s certainly no rational reason to believe that this would be the case.
Beneficial symbiotes aren’t even common in SF. I can’t name a single case in which a disfiguring symbiote has been good for someone. The closest I can get to it is the symbionts from the Babylon 5 episode “Xenogenesis,” which was a very bold move on the part of the show. But even the hideous symbionts caused pain and disfigurement only for a moment, and then they vanished invisibly within their hosts.
So for “Whoever Is Not For Us,” I wanted to break that trend and ask what would happen if the truth came disguised in ugliness. It was a fun story to write. I hope you enjoy it.