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The Scariest Monsters On 'The X-Files,' Ranked

List Rules
Vote up the baddies on 'The X-Files' that freak you out the most.

Throughout its run, The X-Files lured in viewers with conspiracy theories and scary monsters. Every week, FBI agents Dana Scully and Fox Mulder pursued their mysterious targets with a combination of science, open-mindedness, and perfect timing. While some fans dig deep into the underlying story that evolves over the course of the show, others prefer the stand-alone monster-of-the-week episodes that delve into the paranormal with humor, horror, and foreboding.

While some of the supernatural villains on this list were stopped in their evil pursuits, others were not so easy to sabotage, making them the most memorable scary monsters on The X-Files. Which of the creatures below kept you up at night when you first encountered them? Who would you be the most frightened to meet in a dark alley? Is the scariest monster from The X-Files still out there?

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