Xenomorph

The xenomorph (also known as a XX121 xenomorph, Internecivus raptus, or simply the Alien or the creature) is a fictional endoparasitoid extraterrestrial species that serves as the titular main antagonistic hostiles of both the Alien and Alien vs. Predator franchises from 20th Century Studios, and a minor antagonist in Predator: Concrete Jungle.

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), 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). It also returned in the FX television series Alien: Earth (2025). In addition, the xenomorph appears in various literature and video game spin-offs from the franchises.