Enterprise2001

[Phlox has discovered something odd during Travis' autopsy]

Archer:
Did you find something?

Dr. Phlox:
As a matter of fact, I did. This is not Ensign Mayweather.

Archer:
What?

Dr. Phlox:
It's a nearly perfect replica. I've never seen a lifeform duplicated in such extraordinary detail, from its epidermis down to its cellular proteins. This is remarkable work.

Archer:
If it's so perfect, how do you know it's not him?

Dr. Phlox:
You recall what happened to Crewman Fisher last month after our visit to Tessik Prime?

Archer:
He came down with Rigelian fever.

Dr. Phlox:
I inoculated the entire crew to prevent an outbreak. Would you mind rolling up your sleeve?

[Phlox puts a cuff over Archer's wrist and shows his bloodstream on the monitor]

Dr. Phlox:
The vaccine contained millions of genetically altered microbes. Most of them are still in your bloodstream. They typically survive for, oh, at least several weeks.

[Phlox places a cuff on the corpse]

Dr. Phlox:
Every one of the alien microbes in this body is dead.

Archer:
Couldn't they have been killed by the isolytic shock?

Dr. Phlox:
These microbes thrive on isolytic energy. If anything, they would have multiplied. I believe that someone, or something, has abducted Ensign Mayweather and left this facsimile in his place.

Archer:
Apparently bulkheads aren't the only thing this station can replicate.