Re: Similarity between "Alien" and "Signs"

> > Apparently that race (like the large guy they find in the piolet
> > chair) conquers planets by going from one to the next and depositing
> > the Aliens on the planet where they run wild killing everything in
> > sight and once they are finished they let out a gas that then kills
> > off the aliens and they can come in and claim the planet.

Why bother with the "alien" element though?  I mean, if you've got a killer
gas that you hit an entire planet with, why go to the trouble of unleashing
the aliens first?  Just use the gas outright...