Marvel's Crossroad dimensions. Some of those places could be written up to be pretty scary. Some of the extra-dimensional beings were also, or could also be written to be way off of the charts in terms of power.
STO
StoicAvenger
Also if written well, Mr. Hyde has a high creep factor going on. I mean, the guy is a super powered serial killer.
LEO
leonidasMWHAHAHAHA!
joker and arkham when written well.
TD
the DarkoneSenior Member
Ertigan!!
Jokers mind!
Marvels crossroads, it even made the Hulk scared 😬