MULDER: It's, uh... it's an unsolved case.

DALES: No. it's a case that's been designated unsolved.

COHN: We are fighting a powerful enemy in a war of ideology. In any war there are secrets--truths that must be kept from the public in order to serve the greater good.

BAHNSEN: I recognize one of these names. It's in an X-file.

DALES: An "X-file"?

BAHNSEN: Yes, unsolved cases. I file them under "X."

DALES: Why don't you file them under "u" for "unsolved"?

BAHNSEN: That's what I did until I ran out of room. Plenty of room in the "X"s.

DALES: Who decides when a case gets an "X"?

BAHNSEN: The director's office. It's, uh... it's kind of a dead end. No one's supposed to see them, but it makes for interesting reading.

DALES: It's called xenotransplantation. It's, uh, the grafting of another species into the human body. It's a procedure that nazi doctors experimented with during the war...

HOOVER: If we are to defeat the enemy, we must use their tools. We must go further. We must do those things which even our enemies would be ashamed to do. It is only through strength that we can make our enemies fear us, and thereby ensure our own survival.