“Roadkill” (Season 2, Episode 16): This episode was terrifying mostly because of the twist that the stranded woman Dean and Sam have been helping all episode is actually a ghost herself, trapped in a cycle of terror.
“Asylum” (Season 1, Episode 9): This episode truly felt like a mini-horror movie come to life.
The backdoor pilot for Supernatural’s spin-off, Wayward Sisters, was great for a few reasons, but one of our favorite parts was that it actually gave us a good scare.
This episode had a very nice haunted house thing going on, but it also made us forever wary of “imaginary friends.”