Mindhunter's Season 2 just set up its ultimate villain for a third season. 1 / 8
The final scene shows the BTK killer resuming his sadistic duties. 2 / 8
Throughout the series, we've been teased about the BTK killer's training. 3 / 8
He's embraced his identity and the show could jump from the '70s to 2005. 4 / 8
There, he got caught due to arrogant letters written on a floppy disk. 5 / 8
The show already gave fans Charles Manson this season... 6 / 8
... And the likes of Ed Kemper the season before... 7 / 8
... Thus, a showdown with the BTK killer would bring the story full-circle. 8 / 8