This episode (and its sequel) can be enjoyed by any sci-fi fan. As I'm plowing through the X-Files seasons on DVD, I'm guessing I had seen about 10% of the episodes, and I remember this one like it was yesterday.
Dreamland is top notch for TV. It's tense, it's funny, and it will keep you guessing. Michael McKean guest stars as a loser employee of Area 51. He stops Mulder and Scully on a highway to keep them out of the area when a low-flying something-or-other emits some sort of pulse-a-ma-jigger that swaps the souls of Mulder and McKean's character, Fletcher. Fletcher loves the swap. Mulder, of course, is less than enthusiastic.