
Endangered Species is a horror film that fits within the science fiction horror subgenre, blending elements of alien invasion and creature feature narratives. Typical elements include suspenseful police investigations, gruesome and horrifying murders, and the presence of a deadly otherworldly being that threatens humanity. The film revolves around law enforcement protagonists, such as Police Lt. Mike Sullivan and a prison warden, as they confront a lethal extraterrestrial threat. What makes this title stand out in the horror genre is its combination of a serial killer-style mystery with the introduction of an alien killing machine, as well as the addition of an alien hunter who aids humans, creating a dynamic not often seen in standard horror films.