Dana Scully: Platyhelminthis are often hermaphroditic. Mulder, this is amazing. It's vestigial features appear to be parasitic, but it has primate physiology. Where the hell did it come from?
Fox Mulder: I don't know, but it looks like I'm going to have to tell Skinner that his suspect is a giant, blood-sucking worm after all.
Dana Scully: Flatworms are what are known as obligate endoparasites. They live inside of the host, entering the body through the ingestion of larvae or eggs. They are not creatures that go around attacking people.
Fox Mulder: Well, that's good. I didn't want to have to tell Skinner that his murder suspect was a giant, blood-sucking worm.
Scully: Somebody shoved this under my door. I guess you really do have a friend in the FBI. And, Mulder, when you see Skinner to hand in field report, I know that it is your decision but, I hope that you know that I'd consider it more than a professional loss if you decided to leave.
Fox Mulder: You know, sometimes, it just gets hard to smile through it when they ask you to bend down and grab your ankles. You know?
Dana Scully: It's not exactly as if you've ever tried to fit into the program.
Walter Skinner: The Justice Department has asked the suspect be transferred to an institution for a full psychiatric evaluation.
Fox Mulder: This is not a man, it's a monster! You can't put it in an institution.
Walter Skinner: What do you do with it, Agent Mulder? Put it in a zoo? It killed two people.
Mr. X: I think you should know, you have a friend at the F.B.I.
[at a sewage treatment plant]
Fox Mulder: And all the sewage comes through this plant?
Ray: Five hundred and sixty thousand people a day call my office on a porcelain telephone.
Fox Mulder: Have you ever seen one of these?
[holds up a specimen jar]
Ray: Looks like a big ol' worm.
Fox Mulder: It's called a fluke. It came from the body they pulled out of the sewer.
Ray: Wouldn't surprise me. No telling what's been breeding down there in the last hundred years.