How Would Satan Interact With Aliens?

Let's say there are aliens who decide to visit Earth for whatever reason and Satan and his demons take notice. How would they interact with these visitors from space? Good and bad?

And if there was some kind of galactic superpower, what would be their reputation among it? (Let's say Ol' Scratch and his mooks also occasionally visited planets with advanced alien civilizations on them)

He would be like the ultimate evil who seeks to conquer not only the Earth, but the entire universe as well. A malevolent trickster with vast cosmic power, gleefully torments humans for his own amusement and commands legions of demons.