The purpose of this paper is to examine the multiple versions of "Invasion of the Body Snatchers" in concert and determine the reason for their continued presence in the American cultural landscape. To do so I will look at the novel and four films and examine the context in which they were created. In reexamining the novel and films, a central theme begins to emerge: interiority. Fear in "Invasion of the Body Snatchers" moves from an external to an internal threat. The bodily locus of the monstrous other has been re-purposed and re-projected outward. The internal nature of the monstrous threat is displayed in the narrative’s use of production and distribution, mental health professionals, pseudo-families, and the vilification of sleep. Finally, this paper will examine the studio influence on the various films and their impact on the relative endings.