Mulder: I don't think this is just ordinary diesel oil, Scully. I think it's a medium. A medium being used by some kind of alien creature that uses it to body jump.
Scully: So you're saying that this stuff has intelligence?
Mulder: I think that it came off of whatever they pulled off the bottom of the Pacific Ocean. It's been waiting down there for 50 years for another host, another body, to bring it up to the surface.
Scully: Waiting to jump into the diver and then into the diver's wife?
Mulder: And then into Krycek.
Mulder: I think that Mrs Gauthier went to Hong Kong under the control of this thing to find Krycek. I know... I know how it sounds.
Scully: Is anybody NOT looking for Krycek?
Mulder: No. But I think the $64,000 question is, what is this thing looking for. You know, now that it's in Krycek, what does it want.