I absolutely loved this episode... and I'll echo Dave: first episode where I was actually scared! Terrified! They were incredibly creepy creatures. Mt heart was in my mouth a few times. <g>

The episode is based on a short story by Steven Moffat, like Marcus said, and the story is up on the BBC website if you're interested. smile Here. It was originally printed in the 2006 Annual.

Julie smile

Mulder: Imagine if you could come back and take out five people who had caused you to suffer. Who would they be?
Scully: I only get five?
Mulder: I remembered your birthday this year, didn't I, Scully?

(The X-Files)