Alien Parasite Movies

Extraterrestrial parasites infect teachers and students, take control of their bodies, and spread through the school; identifying and stopping the host takeover drives the entire conflict.

An extraterrestrial parasite infects Grant and subsequently uses slug-like organisms to invade and control townspeople, making parasitic infection and collective host takeover the movie's core threat.

Facehuggers forcibly use living hosts to implant developing Xenomorphs, and this parasitic reproductive cycle is a central and sustained source of danger.

An extraterrestrial black-oil organism infects humans and uses their bodies to gestate alien creatures, with the infection and its concealed propagation forming a central threat.

The extraterrestrial Symbiotes cannot survive without compatible oxygen-breathing hosts, transfer between bodies, and can take control of them; host dependence and takeover drive the central conflict.

The Strangers are extraterrestrial parasites that use human bodies while experimenting on humanity, making their dependence on hosts important to the premise, although memory manipulation and identity experiments are more foregrounded than parasitism itself.

Starro produces smaller extraterrestrial organisms that attach to human faces and take control of their bodies, creating a host-controlled army, though this mechanism becomes central relatively late in the film.

An extraterrestrial organism lives inside a returning cosmonaut in a dependent host relationship and periodically emerges from his body, making the alien-host connection central to the story.