The xenomorph (also known as a Xenomorph XX121, Internecivus raptus, or simply the alien or the creature[a])[1][2][3][4] is a fictional endoparasitoid extraterrestrial species that serves as the main antagonist of the Alien and Alien vs. Predator franchises. The species made its debut in the film Alien (1979) and reappeared in the sequels Aliens (1986), Alien 3 (1992), Alien Resurrection (1997), and Alien: Romulus (2024). The species returns in the prequel series, first with a predecessor in Prometheus (2012) and a further evolved form in Alien: Covenant (2017),[5] and the 2019 short films Alien: Containment, Specimen, Night Shift, Ore, Harvest, and Alone. It also featured in the crossover films Alien vs. Predator (2004) and Aliens vs. Predator: Requiem (2007), with the skull and tail of one of the creatures respectively appearing briefly in Predator 2 (1990), Predator: Concrete Jungle (2005), Predators (2010), and The Predator (2018), as a protagonist (named 6) in the video game Aliens vs. Predator (2010), and will return in the upcoming FX television series Alien: Earth (2025). In addition, the xenomorph appears in various literature and video game spin-offs from the franchises. The xenomorph's design is credited to Swiss surrealist and artist H. R. Giger, originating in a lithograph titled Necronom IV and refined for the series's first film, Alien. The practical effects for the xenomorph's head were designed and constructed by Italian special effects designer Carlo Rambaldi. Species design and life cycle have been extensively augmented, sometimes inconsistently, throughout each film. Unlike many other extraterrestrial races in film and television science fiction (such as the Daleks and Cybermen in Doctor Who, or the Klingons and Borg in Star Trek), the xenomorphs are not sapient toolmakers — they lack a technological civilization of any kind, and are instead primal, predatory creatures with no higher goal than the preservation and propagation of their own species by any means necessary, up to and including the elimination of other lifeforms that may pose a threat to their existence. Like wasps or termites, xenomorphs are eusocial, with a single fertile queen breeding a caste of warriors, workers, or other specialist strains. The xenomorphs' 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, mature into adulthood within hours, and seek out more hosts for implantation.