Between Criminal Minds and the revival Criminal Minds: Evolution season 3 confirmed, the serial killer series is going into its 18th season. Over the years, many characters have come and gone, including Elle Greenaway, Aaron Hotchner, Spencer Reid, Derek Morgan, Matt Simmons, Alex Blake, Kate Callahan, and more. Since these characters weren’t killed off like Jason Gideon and Stephen Walker, there’s a chance they could return in Criminal Minds: Evolution season 3. Based on the conspiracy theory themes in Criminal Minds: Evolution, I believe Elle would be the most interesting returning character. She left in Criminal Minds season 2 and has been barely mentioned since, and I think her return would be shocking and thrilling, whether she comes back to work with the FBI, becomes a vigilante killer, or both.