Can Weird People in Strangerville Travel to Other Worlds?

Yesterday the guy from StangerVille with the cowboy hat randomly came into my apartment in SanMyshuno without any invitation. He walked into the bathroom while my sim was sleeping and drank a glass of water from the sink. I quickly locked the bedroom door, because i was afraid of him. ??? I think he has the infected trait, I mean that's why he was Posessed. But I have no idea why that happenned, because he never met my sim, and my sim never visited StrangerVille. And it was a completely new game I just started.