Alien parasites

An alien parasite is a parasitic organism of extraterrestrial origin. Such entitites may exist in the form of biological organisms or may infect a human host as a form of bacteria or some other strain of alien virus. Due to the otherworldly nature of such a phenomenon, alien parasites appear in the sci-fi subgenre of horror fiction. The Xenomorphs that tend to plague 22nd century space miners in the [[Aliens film series|Aliens film series are examples of alien parasites as they use humans as living incubators for their young. The possessing entities from the Invasion of the Body Snatchers film projects are another example of alien parasites as they are disembodied entities that invade a host like a virus, and subvert their very form and identity.