Scariest SF Films of All-Time

Halloween is considered the turf of witches, ghosts, goblins, vampires and werewolves, but what about the impact of Science Fiction on Halloween? Haven't some of the most terrifying films of all time emerged from the realm of Science Fiction?

Here's our take on the Eight Scariest Science Fiction Movies of All Time. See if you agree. (Click on the titles to see movie trailers.)

Number 8: The Fly
A brilliant but eccentric scientist transforms into a giant man/fly hybrid after one of his experiments goes horribly, disgustingly wrong.

Number 7: The Invasion (of the Body Snatchers)
A Washington psychiatrist unearths the origin of an alien epidemic. The latest incarnation of the often remade classic.

Number 6: The X-Files: The Movie
The truth is out there-in all it's glorious creepiness-from spooky bee experiments to an eerie Antarctic laboratory.

Number 5: The Thing
Scientists in the Antarctic find a creature that has been buried in the ice for 100,000 years--a shape-shifting alien that assumes the appearance of the people it kills.

Number 4: War of the Worlds
Alien invaders wreck havoc on the planet and humankind in this modern remake of the radio classic that caused widespread panic when it first aired on August 21, 1953. Based on a novel by H. G. Wells.

Number 3: Signs
A family living on a farm finds mysterious crop circles in their fields which suggests something more frightening. It soon becomes more than a suggestion when alien beings invade their home and their world. Signs made tin foil hats and baby monitors into something sinister.

Number 2: Jurassic Park
Scientists clone dinosaurs to populate a theme park which suffers a major security breakdown and releases the dinosaurs. Jurassic Park introduced us all to the two-legged terrors called Raptors, and an up close and personal staredown with a T. Rex. Several more Jurassic Park films were released, but none had the impact of the original blockbuster.

and the Scariest Science Fiction Movie of All Time...

Number 1: Alien/(Aliens)
In Alien, the crew of remote mining ship Nostromo investigating a suspected SOS lands on a distant planet harboring a hostile species and unwittingly take a specimen onboard their vessel. In Aliens, Ripley, the sole survivor of the Nostromo still in hypersleep 50 years later is picked up by a salvage team. She returns to the planet of alien origin with a squad of Colonial Marines. The Alien franchise declares itself "The scariest movie ever made" and made Ripley (not to mention Private Vasquez in Aliens) an icon of savvy female heroines. Re-released on Halloween 2003.

Wait. We forgot the best one(s)? Tell us about it.