In 1979, "the scariest movie ever made" brought the horror genre to space and made Sigourney Weaver a household name.
In James Cameron's sequel, Ripley (Weaver) joins a squad of marines to eradicate xenomorphs on a planet colonized by humans.
In David Fincher's feature debut, Ripley finds herself in an all-male penal colony planet infested with face-huggers.
In Antarctica, scientists land in the middle of a fight between two deadly extraterrestrials.
Two hundred years after her death, Ripley is cloned for her DNA in order to breed new aliens. Wynona Ryder costars.
The lead monsters of Alien and Predator take their battle to America after their spaceships accidentally crash.