The alien, also called the xenomorph,, is a fictional parasitoid extraterrestrial species that is the primary antagonist of the Alien film series. The species made its debut in the 1979 film Alien and reappeared in its sequels Aliens (1986), Alien 3 (1992), and Alien Resurrection (1997). It has also appeared in the series’s two spinoffs Alien vs. Predator (2004) and Aliens vs. Predator: Requiem (2007), as well as the series’s subsidiary literature and video games.