Wow. I remember the first I watched this episode (I was around 12 back then), I thought X Files was just a show about a guy trying to prove the existence of extraterrestrial life. I was so not ready or prepare for this. After watching it, I just couldn't sleep alone for 3 days. This is such a great episode. So scary and really violent. I still can't believe they aired that on national television. Back then, it was revolutionary (especially in France where french TVseries are just crap). This is the first episode written by Glen Morgan and James Wong, my favorite writers on the show. We see for the first time that Mulder is not appreciate by his colleagues. Ther are some nice moments too between Mulder and Scully; and the end is really really disturbing, especially if you are a 12 years old. One of the best episode ever. A must see.