Don't know what they are, they look human enough. They appear every 3 years, and often all they seem to do is check up on me; that's why I call them watchers. It's always someone different but they share a few physical characteristics. It's not just me that finds them weird; I heard from other people who were with me at the time that there was something strange about them. Ah, it's just me being very paranoid I guess.