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The Aliens' biological life cycle involves traumatic implantation of endoparasitoid larvae inside living hosts these "chestburster" larvae erupt from the host's body after a short incubation period, rapidly mature from juvenile into adulthood within hours, and seek out more hosts for implantation. Like wasps or termites, Aliens are eusocial, with a single fertile queen breeding a caste of warriors, workers, or other specialist strains. Unlike many other extraterrestrial races in science fiction (such as the Daleks and Cybermen in Doctor Who, or the Klingons and Borg in Star Trek), the Aliens are not sapient tool-makers: They lack a technological civilization of any kind, and are instead primal, predatory creatures with no higher goals than the propagation and self-preservation of their own species, including the elimination of other lifeforms that may pose a threat to their existence. The species's design and life cycle have been extensively augmented, sometimes inconsistently, throughout each film. The practical effects for the Alien's head were designed and constructed by Italian special effects designer Carlo Rambaldi. Giger, originating in a lithograph titled Necronom IV and refined for the series's first film, Alien. The Xenomorph design is credited to Swiss surrealist and artist H. In addition, the Alien appears in various literature and video game spin-offs from the franchises. Predator: Requiem (2007), with the skull of one of the creatures appearing briefly in Predator 2 (1990). It also featured in the crossover films Alien vs. The species returns in the prequel series, first with a predecessor in Prometheus (2012) and a further evolved form in Alien: Covenant (2017). The species made its debut in the film Alien (1979) and reappeared in the sequels Aliens (1986), Alien 3 (1992), and Alien Resurrection (1997).

The Alien (also known as a Xenomorph XX121 or Internecivus raptus) is a fictional endoparasitoid extraterrestrial species that is the antagonist of the Alien film series.