Fans have begun to count down to the premiere of season 11 of Criminal Minds. Here's all the essential information a true fan must have before the CBS procedural returns.

Could Ella Greenaway Return For Season 11?  

The latest spoiler has to do with Matthew Gray Gubler's character Dr. Reid. Speaking to Entertainment Weekly, Criminal Minds executive producer, Erica Messer, revealed that Dr. Reid is going to have a very dramatic moment in the season 11 premiere.

Reid is going to be responsible for a crucial takedown in the episode, and it is going to be a rather disturbing scene. "He gets to do a take down Reid style, which is just using his brain with a physical thing that's really disturbing - you have to turn away," Messer said. "It's not a standoff with a gun, it's a Reid version of a takedown."

Showrunner 'Absolutely Wants' Jane Lynch Back In Season 11  

Another big spoiler was dropped by Gubler in a recent interview in which he revealed that another member of the BAU will be exiting in the next chapter. In fact Gubler will be directing the episode in which the regular member makes his departure, the actor didn't give away any hint as to who this might be, though.

This season we will also get to see an exciting addition to the BAU. Actress Aisha Tyler will play the part of Dr. Tara Lewis, a forensic psychologist who specializes in criminal cases.

Another guest star, who has great experience working on procedurals, is joining the show. Marisol Nichols ofNCIS fame, will be joining the BAU for a a few episodes as a recurring character, portraying Agent Colburn, "a top agent at a Los Angeles outpost of the FBI."

In an interview with Digital Spy at the Monte Carlo TV Festival, Gubler revealed that he hoped that the next chapter would delve more into Reid's personal life.

"I'd love to delve more into his home life and his social life and to see his mother return and just to, kind of, like figure out what he does on the weekends," Gubler said.

Showrunner Erica Messer and some cast members have also been talking in various interviews about what fans can expect from the next chapter.

Joe Mantegna, who plays David Rossi in the CBS procedural answered some fan queries in a AMA Reddit Q&A. The actor revealed a few exciting things about season 11. Mantegna strongly hinted at Paget Brewster's (Emily Prentiss) return.

"Well, there's been talk of - there's a chance Paget may make an appearance now and again," he said. "Eric our producer mentioned it in an interview that there's a possibility that Paget may return from time to time.

Previously a behind-the-scenes still from filming of season 11 of Criminal Minds might have revealed the first villain from the next chapter.

In the image -- posted via the Set_Report Twitter page of the show -- a ghoulish looking figure with his face painted white and black is seen. The indistinguishable actor playing the part is seen smiling while pulling a thumbs-up gesture. The picture, which was posted on the "CM_SetReport" Twitter account for the show, also drops a cryptic question:

"What's black and white and red all over?"

Season 11 will premiere on Sept. 30.

The finale of Criminal Minds aired on May 6.

Watch a teaser for season 11: