2) Skeksis (The Dark Crystal)
The Dark Crystal is what is: Dark. The story, atmosphere, and overall design all exude a sense of unease, of which is encapsulated within the movie's main villains, the Skeksis. Meant to be embodiments of the seven deadly sins, the Skeksis hissed, shrieked, and cackled their way straight into our nightmares—and gave us an irrational fear of flightless birds for a few years (story for another time, kiddies). All things considered, it's only fair that we give these revolting avian monsters some credit.