Writer: Howard Gordon
Director: David Nutter
Original Broadcast: AU: 26.04.1995 US: 18.11.1994
Episode Availability: DVD: AU CA UK US
Special Agent Dana Scully · Gillian Anderson
Special Agent Fox Mulder · David Duchovny
Peter Tanaka · Hiro Kanagawa
Eric Parker · David Kaye
Vosberg · David Lewis
Dr Adam Pierce · Tuck Milligan
Jason Ludwig · Leland Orser
Technician · Torben Rolfsen
Jesse O'Neil · Shawnee Smith
Dr Daniel Trepkos · Bradley Whitford
A malfunction in a robot designed for volcanic exploration yields evidence of a lifeform living in the caves. When this lifeform seemingly causes the death of a member of the research team, Mulder and Scully are flown out to the site to investigate before anyone else dies.
Mulder: "You think he's responsible for what happened?"
Dr Pierce: "Whatever there is between, me and Trepkos, I pray that he isn't. We've got $20 million tax dollars in this project. If word of it were to get out, it could destroy years of work. I'm afraid to go through proper channels."
Mulder: "We're not exactly proper channels."
Mulder: "Scully, I don't think it's a good idea for you to go."
Scully: "Mulder, I appreciate your concern, but I'm ready; I want to work.
Mulder: "Well, maybe you should take some time off."
Scully: "I've already lost too much time."
Jason Ludwig: "This isn't what it looks like."
Mulder: "Just about took my head off."
Jason Ludwig: "I told you I made a mistake, okay? I'm sorry, alright?"
Mulder: "Well, who the hell are you?"
Jason Ludwig: "I'm Ludwig. Jason Ludwig. I'm the robotics engineer for the descent team."
Mulder: "Do you always greet people this way?"
Jason Ludwig: "I heard a noise, okay? I thought it was him. I was just trying to protect myself. You know, self-preservation."
Mulder: "Well, who did you think I was that you had to protect yourself?"
Jason Ludwig: "Trepkos."
Jesse O'Neil: "...but with his medication he was just fine." [Trepkos]
Jason Ludwig: "Yeah, well I think Ericson's wife might disagree with that."
Mulder: "What do you make of Mr Trepkos' neighbourhood?
Scully: "What do you mean?
Mulder: "Don't you think their behaviour's a little bizarre? Almost paranoid?
Scully: "Well, considering what they've been through, not especially.
Mulder: "They were practically climbing the walls in there.
Scully: "Well, they've been living in the middle of nowhere for almost a year. One of their team members is dead, probably at the hands of another. You have to expect some heightened level of emotional distress.
Mulder: "No, but it's more than that. There's something they're not telling us.
Scully: "Based on what?
Mulder: "Based on when Ludwig tried to play T-Ball with my head. He knew I wasn't Trepkos.
Scully: "Now, Mulder, you're sounding paranoid.
[Mulder is playing a tape of Dr Trepkos' notes]
Dr Trepkos: "Samples 7, 12 and 22 also contain trace evidence of the organism. The possibility of this new, or perhaps unfathomably old, life form has left me sleepless. Wondering if I haven't lost all perspective. If my intense desire to find the truth hasn't finally eclipsed the truth itself. Our meddling intellect misshapes the beauteous forms of things. We murder to dissect. My mind is a tangled knot I can no longer untie. Daily I fight the urge to sever it completely to stop this dissent."
[Mulder on shortwave]
Search and Rescue: "What's the nature of the contagion? Agent Mulder?"
Mulder: "Tell them it's a biological agent... of unknown origin."
Mulder: "I'm going to go find Trepkos."
Scully: "What if he's already dead?"
Mulder: "He'll have a tough time answering my questions. I've got to find out what he knows. What he's found could change everything understand about the origin and evolution of life."
Scully: "He's dangerous. Mulder. he's already killed two men."
Mulder: "Then I'll have to find out why."
Scully: "Will you at least let me go with you?"
Scully: "Look, I know what you're thinking, but you have to get past that, we both do. I'm back, and I'm not going anywhere."
Mulder: "You have to finish the autopsy on Tanaka. Hopefully, that'll give us a better idea of what we're dealing with, whatever it is. I'm counting on you to keep us all from ending up on that slab."
Mulder: "Why are you doing this, Trepkos? He's already dead. How many times do you have to kill him?"
Dr Trepkos: "It's not him I'm trying to kill."
Scully: "Based on this preliminary data, I have come to the following hypothesis. That unless the spores are ingested or inhaled by the host organism immediately upon their release they become harmless. Effectively dead."
Dr Trepkos: "I say the Earth holds some truths best left buried."
Mulder: "Like the spore?"
Dr Trepkos: "Who are you?"
Mulder: "I'm Special Agent Mulder. I'm with the FBI."
Dr Trepkos: "You don't look like a policeman."
Mulder: "I came down here to investigate Ericson's death."
Dr Trepkos: "That's not why you're here. You still believe you can petition heaven to get some penetrating answer. If you found that answer, what would you do with it?"
Dr Trepkos: "In a single moment, everything that science held sacred suddenly turned on its head."
Mulder: "And of the events that occurred at Mount Avalon between the 11th and 13th of November 1994, mine stands as the only record."