Didn't the first movie say that their whole civilization moved from planet to planet. So you're saying a completely different race of aliens wants to kill us now? Man, where the fuck are the good aliens, they always gots to be trying to kill us, well maybe that could be the second movie, bad aliens try to kill us and then some other race of good aliens save us, then in the third they try to kill us because they are really evil. Man I could do this for a living, hehe.