In Alien 3, when Ripley finds herself stranded on a prison-colony planet, the unruly male convicts turn out to be the least of her concerns. While both of Ripley's companions are killed when her spaceship crashes, another much more unwelcome creature survives. A stowaway Facehugger escapes into the compound where it uses an inmate's pet Rottweiler as a host, bringing to life one of the meanest, nastiest creatures in the Alien saga. With the genes of a dog, this new Alien runs on all fours, and strikes with never-before-seen speed and accuracy.