Aliens tend to be very scary. Whether they’re sucking blood from some unsuspecting, love struck plant store employee or leaving crop circles out behind Mel Gibson’s barn, unleashing slugs who share group consciousness or luring us into a fearsome carnival to learn the true meaning of “scary clown,” aliens are tough to trust. Just like Mulder says, and indeed, it was the fresh new look at The X-Files that inspired this week’s count down: the scariest alien movies.