Alien (creature in Alien franchise)
The Alien is a fictional endoparasitoid extraterrestrial species that is the titular 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). The species returns in the prequel series, first with a predecessor in Prometheus (2012) and a further evolved form in Alien: Covenant (2017). It also featured in the crossover films Alien vs. Predator (2004) and Aliens vs. Predator: Requiem (2007), with the skull of one of the creatures appearing briefly in Predator 2 (1990). In addition, the Alien appears in various literature and video game spin-offs from the franchises.