When people think of the greatest villains in science fiction, most go for obvious answers like Darth Vader or the Xenomorphs. Villains within the popular genre tend to be frightening, manipulative, or just plain scary with their nefarious methods. However, people should not rule out the antagonists found in sci-fi stories on the small screen.
Source：https://www.cbr.com/10-best-villians-scifi-tv/
