Ridley Scott's Alien is widely considered the ultimate sci-fi horror movie, but a few genre films, like The Fly and The Thing, are even better.

Aliens, Arrival, Nope, Predator, Lilo & Stitch, E.T. the Extra-Terrestrial, and more make up our list of the best alien movies of all time.

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The weirdest thing about "Slither" is not so much that James Gunn made it. It's more that the writer/director of this ...