While Criminal Minds viewers are still raging over the firing of A.J. Cook, we have actual storyline news to deliver for next season.

Following a fifth season finale that featured Tim Curry as a creepy serial killer, the CBS drama will pick back up on this character and this plot as soon as it premieres in the fall.

"He's really the most prolific killer we've ever seen. He's done this his entire life," co-executive producer Erica Messer told TV Guide of Curry's Billy Flynn. "The premiere will have to revisit and say, 'We know it's all about the dark, but why? Where did he start?'"

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.