David Fincher's harrowing Netflix drama Mindhunter has returned for season two, and its subject matter is just as creepy as ever. While the crime drama digs into the lives and crimes of numerous serial killers interviewed by FBI agents Holden Ford (Jonathan Groff) and Bill Tench (Holt McCallany) as usual, it continues tugging on the thread of the Btk killer, who's subtly introduced through brief scenes scattered throughout season one. But in the new episodes, Mindhunter makes it clear who he is from the get-go, and spotlights some particularly harrowing details of his murders and his victims.
The Btk Killer - aka Dennis Rader, who's portrayed in the show by actor Sonny Valicenti - murdered 10 people in Kansas between the years of 1974 and 1991. Mindhunter's first season takes place in 1977, when the Btk Killer had already killed five people,