This week, almost everyone on the Enterprise and most of the population of Vulcan fall prey to energy-based brain parasites that take over their minds, and it looks like the only cure is fresh air and exorcise. Will Spock, Bones, and the New Girl of the Week tell the parasites “Get behind me, Satan”, or will they succumb to the temptation to let them take over the galaxy? It’s J.M. Dillard’s Demons, or, Possession Is Nine-Tenths of the Crew.