© 2017 Johns Hopkins University Press Incubation Period In the 1965 movie Incubus, a pre- Star Trek William Shatner, with characteristic avidity, plays the role of Marc, a wounded soldier who comes to the village of Nomen Tuum in search of curative water (fig. 1). While there, he is seduced by a beautiful young succubus, whose appointed task is to prevent Marc’s recuperation and instead deliver his soul to hell. What transpires is a bit too complicated, or silly, to merit recounting in detail...