The "Alien" (sometimes referred to as a "Xenomorph") is a fictional endoparasitoid extraterrestrial species that is the primary antagonist of the Alien film series. The species made its debut in the film Alien (1979), and reappeared in the sequels Aliens (1986), Alien 3 (1992), and Alien Resurrection (1997), as well as the crossover franchise Alien vs. Predator (2004) and Aliens vs. Predator: Requiem (2007). A similar creature of a slightly different design also briefly appears in the Ridley Scott film Prometheus (2012). In addition, the Alien appears in various literature and video game spin-offs from the franchises. Unlike many other recurring enemy extraterrestrial races in science fiction, the Aliens do not have a technological civilization, but are predatory creatures with no higher goals than the propagation of their species and the destruction of life that could pose a threat (the film Prometheus implies they were engineered as a biological weapon by an advanced race). Like wasp...