15. The Faculty (1998)
Invasion of the Body Snatchers for the MTV generation, this slick reinvention pits body-snatching aliens against a group of high schoolers who suspect that something's not quite right about their teachers.
14. Killer Klowns from Outer Space (1988)
This ridiculous, fun horror comedy has achieved cult status over the years for its tale of clown aliens who kill humans with a circus flair -- including balloons animals, shadow puppets and cotton candy.
13. The Puppet Masters (1994)
© Hollywood Pictures
Based on the Robert Heinlein book that pre-dated Invasion of the Body Snatchers, this similarly plotted story is given a pulse-pounding interpretation that suffered from being released soon after 1993's Body Snatchers.
12. The Arrival (1996)
© Live Entertainment
Pitch Black writer/director David Twohy delivers X-Files-ish suspense and international intrigue in a smart plot that combines alien invasion with global warming. And Chalie Sheen.
11. Day of the Triffids (1962)
More thrilling and serious-minded than the "killer alien plants" plot would imply, <i>Day of the Triffids</i> captures the terror and mayhem of an alien-induced apocalypse.
10. The Hidden (1987)
© New Line
Sly humor propels this little gem about an extraterrestrial criminal that takes over human bodies and goes on an often-deadly joy ride through Los Angeles, experiencing fun fish-out-of-water encounters.
9. Critters (1986)
© New Line
Fast-paced, fun creature feature about spiny Gremlins-inspired alien fugitives landing near a Midwestern farm and eating everything in sight.
8. Slither (2006)
This funny, energetic entry is basically Night of the Creeps redux, as space slugs invade people's bodies, turning them into brainless zombie-like slaves.
7. Night of the Creeps (1986)
Alien slugs invade dead humans' brains, creating an army of zombies that put a cramp in a local sorority's plans for a big formal dance. Classic '80s horror comedy goodness.
6. They Live (1988)
Subversive and darkly humorous, this cult film from John Carpenter portrays a word in which skeletal aliens have integrated themselves into society by impesonating humans, and only specially designed sunglasses can reveal who's who (or what).