Well-Manicured Man:
The virus is extraterrestrial. We know very little about it, except that it was the original inhabitant of this planet.
Mulder:
A virus.
WMM:
What is a virus but a colonizing force that cannot be defeated, living in a cave, underground, until it mutates and attacks.
Mulder:
This is what you've been conspiring to conceal, a disease?
WMM:
No, for God's sake, you've got it all backwards. AIDS, the Ebola virus -- on an evolutionary scale, they are newborns. This virus walked the planet long before dinosaurs.
Mulder:
What do you mean "walked"?
WMM:
Aliens, Mulder, little green men, arrived here millions of years ago. Those that didn't leave have been lying dormant underground since the last Ice Age, in the form of an evolved pathogen, waiting to be reconstituted by the alien race when it comes to colonize the planet, using us as hosts. Against this we have no defense -- nothing but a weak vaccine. Do you see why it was kept secret? Why even the best men, men like your father, could not let the truth be known? Until Dallas, we believed the virus would simply control us, that mass infection would make us a slave race. Imagine our surprise when they began to gestate.
