What an amazing episode. Samantha Mulder is back but, is she for real?
I always hated the fact that Mulder was such a believer that he actually believed (duh) everything he heard, was told, or read and others took advantage of that. However in this episode, they messed with his emotions.
Mulder was very vulnerable in this episode (unfortunately, it was not going to be the first time). He always felt responsible for his sister's abduction and to have her back was really important that his mind was not clear.
What a shocker for his mother. Not so much for his father. Who knows if he was involved in this.
Scully was in danger again and was doing almost all the job. The end scene is priceless, she realizing it may not be Mulder in the door.