"Criminal Minds" Season 12 may go through more changes following the recent firing of Thomas Gibson as Hotch from the CBS drama. A recent interview with the showrunner reveals that fans and viewers should brace themselves for major changes ahead, which will involve the return of a fan-favorite character.

This article contains spoilers. Continue reading if you wish to learn more about the story.

"Criminal Minds" Season 12 spoilers reveal that the CBS series will be undergoing a few major changes, as the show will be featuring a major arc ahead. In an interview with showrunner Erica Messer, she told TVLine that a character will be returning to the show to help with an upcoming big arc ahead.

"This big arc that we're doing has reenergized everybody, like, 'We can do [a serialized saga],'" she said.

Messer teased that in "Criminal Minds" Season 12, the rest of the episodes will feature changes for all of its characters. There have been speculations that this change may involve Matthew Gray Gubler's character, Reid, especially since one of the upcoming episodes is named after him.

Messer also shared that another character will be returning to the show, which will reveal more about the past of a certain character. "Criminal Minds" Season 12 spoilers from Entertainment Weekly hint that this revelation is bound to surprise a lot of viewers.

The showrunner refused to reveal details about the upcoming episode, which will change the course of things for certain characters in the show. However, Messer explained that the rest of the episodes will be "heavily serialized" and will involve one of the show's heroes.

Many fans are already expressing their worries over Gubler's character in "Criminal Minds" Season 12. As most fans can recall, the current season of the show experienced a major change, as Thomas Gibson has been fired from the CBS drama over an alleged altercation with one of the show's writers.

Do you agree with "Criminal Minds" Season 12 turning into a serialized drama? Let us know your thoughts in the comments section below!