Fluttershy goes into the forest and meets Slender Mane, the creature told in legend, known to foalnap foals, and terrorize anypony he meets, horror stories told foals to keep them from going out at night. At first she is terrified, but then she finds out that just because somepony looks like a horrifying monster doesn't make them one. That doesn't mean everypony is going to accept somepony without a face though either.