Dr. Fright is an enemy of Spider-Man in the 1970's Electric Company series. Dr. Fright (Skip Hinnant) is a monster who has a face so frighteningly ugly that he conceals it beneath an oversized stovepipe hat. He uses this to terrify victims, robbing them when they become frozen in fright. He plans to freeze Spidey but Spidey instead freezes Dr. Fright by holding up a mirror.
Although primarily a comedic villain it could be assumed Dr. Fright is a mutant considering his inhuman appearance and uncanny powers, though this has never been officially confirmed.