While the queen mother alien in 'Alien' is definitely the ultimate in bad (and we've got some feelings about Ash, too), there's something to be said for all of the aliens in the 'Alien' series -- those shiny black creatures with no eyes and strangely human-like teeth, dripping their acidic saliva all over the place. And then there's the facehuggers, who implant human hosts with chest-bursting alien spawn. In space, everything is a bad guy.