fear is a killer at times.

i cant say for sure what doppelgangers origins are. could very well be aliens.

i once had a dream that i was in a classroom in college (the one i was in while i was in college at that time) and all the students were grey aliens. i was not. they were trying to "get me". i ran like crazy.

that would be a very sneaky way for them to integrate into our planet.