9. The Borg, 'Star Trek: The Next Generation'
"You will be assimilated. Resistance is futile." For a collective consciousness of cybernetic organisms, the Borg sure have a way with words. While great Star Trek villains from Khan to Q draw strength from their individual idiosyncrasies and performances, the power of this alien race stems from the dystopian sci-fi perfection of the concept, courtesy of writer Maurice Hurley. The idea of a vast, cool, unsympathetic intelligence floating through the remote corners of the universe, absorbing entire civilizations unimpeded for centuries, is exactly the kind of heady stuff that characterized the franchise at its best. Of course, making them look like Hellraiser gone cyberpunk didn't hurt either — nor did briefly assimilating Captain Jean-Luc Picard as "Locutus of Borg," literally turning him into his own worst enemy.