he's nba superstar chris andersen. but there's a third person manipulating them with just a few key strokes. tonight, the "20/20" investigation that takes us into the frozen, remote wilderness. >> i have water, my coffee. here we go. >> looking for the pulling their strings online. catfishing them without them knowing it. >> the catfish wanted to see how far they could take it. >> this far, threatening her. >> he said he was going to send somebody down there, and i was going to be murdered. >> almost ruining the basketball star's career. >> why chris? >> police are searching his computer. why can't you grasp that you almost took this man's life? >> tonight, we're catching the catfish. you won't believe who is the mastermi mastermind, operating from this tiny house in the middle of nowhere. >> it just got crazy from that point on. >> good evening. i'm elizabeth vargas. >> and i'm david muir. you can call it a catfish or sometimes even a con artist. either way, it's pretty much the same way. someone faking their identity

that's news to andersen. >> she booked through a travel agent of chris'. a birth that matched 21. how did she come through the airport and everything else with security with that date of birth? >> reporter: she threatens to ruin andersen's life and career unless he pays thousands of dollars. >> a full extortion. >> reporter: so she's threatening to ruin chris' career. >> oh, yeah. >> yeah, "you're going to get sued. and he's going to go to prison." and you know, all these threats. >> reporter: the nba player with a mild manner and a big heart now finds his career in jeopardy, a career he worked hard to build. >> the guy had made his way. he pounded his way out of the dirt, and then this? i respond back, "you're talking to his attorney. there's nothing that's happened here that's criminal. you're engaged in extortion. go away." >> reporter: and even if paris is only 17, andersen's relations with her are legal in colorado. but those nude photos are another matter, that amounts to child pornography. >> chris didn't do anything wrong. but it's embarrassing, thi

but stars david duchovney and jillian andersen both on board to reprise their roles as mulder and scully and creator/executive producer chrisl. >> right. whole gang. last year's limited revive sal, catapulting it to number three show behind empire and big bang theory. the numbers might be a little skewed. >> because one of the episodes came after the super bowl. >> lead-in audience this big. still, so many people excited. >> yes, should have like prefaced this skinny here, nerd alert city. >> right. i raise my hand. >> yeah. >> anyway. >> we move on. >> yeah, yes, it is. it is. >> you could argue another nerd alert. hbo releasing. awe all 15 first look photos. don't tell me what happens. >> i know. >> you mean, back dressed in some sort of foxy outfit? >> these photos showing everything from cecre on the iron throne with jamie at her side. >> no. >> they're telling us everything. >> to, i that. let her do it. let it go. and they make landfall, sorry, i am not watching, but i guess i am going to have to start. >> deneres, she is great. loving it. and if assumptions about the photo are correct, after life in exile, deneres ha