Top 10 Bad-Ass Aliens

In James Cameron's 1986 "Aliens" sequel to Ridley Scott's 1979 original "Alien," no one believes Ellen Ripley (Sigourney Weaver) who asserts that aliens live on the planet LV-426. Boy, were they wrong. (Photo: 20th Century FOX)

In the new film "District 9," scary insect-like aliens that make your skin crawl live in a ghetto maintained by humans in Johannesburg, South Africa. (Photo: TriStar)

In "Predator," (1987) a team on a rescue mission find themselves hunted by an extra-terrestrial warrior. (Photo: 20th Century FOX)

In the 1956 film that spawned several spin-offs, a doctor returns to his small town practice to learn that his patients think their friends and relatives are imposters. He later learns that the residents are being replaced by alien pod people, who look normal but show no emotion and kill their human victims. Creepiness at its best. (Photo: Allied Artists) (AP)

In "War of the Worlds" (2005), Ray Ferrier (Tom Cruise) fights to keep his family alive as the Earth is invaded by alien tripod fighting machines. (Photo: Paramount)

The child aliens in John Carpenter's "Village of the Damned" (1995) could give even the bravest of people nightmares. (Photo: Universal)

In "Transformers" (2007), Sam Witwicky (Shia Labeouf) finds himself caught in a war between two extraterrestrial clans, the heroic Autobots and the evil Decepticons. (Photo: Dreamworks)

The late Ricardo Montalban was just plain bad-ass, so any alien he plays is, thusly, also bad-ass. Hence genetically engineered tyrant Khan Noonien Singh from "Star Trek II: The Wrath of Khan" (1982) makes our list. Plus the hair is definitely bad-ass. (Photo: Paramount)

This terrifying creature sparked a whole string of bizarre events in M. Night Shyamalan's "Signs." (Photo: Touchstone Pictures)

Will Smith and Jeff Goldblum teamed up to destroy tech-savy aliens with the sole mission of destroying the world in "Independence Day" (1996). (Photo: 20th Century FOX)