Aliens are green little bastards and just as annoying as you expect them to be from bad science fiction movies. Their greatest fun is abducting other players' minions and returning them to their hands - not as mean as destroying them, placing them on their owner's discard pile, but very annoying. And Zombies hate it, they really do. When abduction is not enough, they also have the nasty ability to exchange bases and they are the only faction with a card ability that simply gives them a victory point. In a game that ends at 15 points, that's pretty good. Go Invaders!