There's nothing more frightening than the unknown.
For this list, we're looking at the scariest baddies that just don't get the same attention as icons like Jason or Chucky.
We're basing our choices on a mix of ominous appearances, cunning plans, and the lengths each antagonist goes to for their plans.
Our countdown includes villains from films such as "Behind the Mask: The Rise of Leslie Vernon" (2006), "Maniac Cop" (1988) & "The Collector" (2009).
We have to dive into some spooky details to talk about these baddies, so a SPOILER ALERT is in order.
Which horror movie villain do YOU think is the least well-known?
Let us know in the comments!