The X Files1998

Special Agent Fox Mulder:
[looking at a vile of serum with a syringe] What's this?

Well-Manicured Man:
A weak vaccine against the virus Agent Scully has been infected with. It must be administrated within 96 hours after first contact or she will be beyond saving.

Special Agent Fox Mulder:
A virus?

Well-Manicured Man:
What is a virus, Mr. Mulder? A rare certain strain of Purity that has been lying dormant in a cave in Texas since the end of the last great Ice Age waiting to be unleashed upon this world?

Special Agent Fox Mulder:
Is this what you and your consortium have been covering up all this time? A virus? A disease?

Well-Manicured Man:
No, no, no, you've got it all backwards! AIDS, the Ebola virus, the common cold... on an evolutionary scale they are newborns. This virus walked the Earth long before the first dinosaurs appeared.

Special Agent Fox Mulder:
What do you mean "walked"?

Well-Manicured Man:
Your aliens, Agent Mulder, your little green men arrived here millions of years ago.