Harrison in “Unfinished Business”

We've been painting a pretty negative picture about our battle with the aliens, but there is a bright side: they can be killed and we're getting pretty efficient at it. One particular incident comes to mind. The aliens had broken into a secure army facility in search of war machines and weapons left over from their earlier invasion. Our intelligence discovered this plan and we wiped them out. What they turn into after they die is the only real indication we have that these were once human beings who are now possessed by aliens. But we can be fooled. As a result of an exothermic reaction, their cells become a horrible broiling mass of decomposing alien and human tissue. They are vulnerable, and so are we. We have already lost a member of our team. We have lost many soldiers in combat, and, of course, all the innocent people. The aliens are deadly and they promise – as their numbers increase and they become more sophisticated – they promise to become even deadlier.