'Criminal Minds' season 11 episode 15 spoilers: Marisol Nichols back as Agent Colfax; UnSub invited into victims' homes

(Twitter/CrimMinds_CBS)FBI Special Agents Jennifer Jareau (AJ Cook), Natalie Colfax (Marisol Nichols) and David Rossi (Joe Mantegna) in a scene from Criminal Minds season 11.

After a one-week break, "Criminal Minds" season 11 is back with a case that touches on how much trust we automatically give people with a badge.

The FBI's Behavioural Analysis Unit (BAU) is handed another compelling case involving a killer who has to be invited in by his victims. According to a synopsis for episode 15, "A Badge and a Gun," Aaron Hotchner (Thomas Gibson) and the rest of the BAU will be combing Los Angeles for a serial killer who wants to be invited first into the homes of his victims.

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While it's unlikely that anyone would willingly invite a killer into one's sanctuary, the UnSub has a particularly nefarious scheme, as the trailer for the upcoming episode shows. The short clip begins with a man nonchalantly entering someone's property. JJ (AJ Cook) is then shown explaining that the UnSub needs his victims to "allow him into their homes" while Reid (Matthew Gray Gubler) is seen checking a house. The agent has his gun drawn and soon discovers a victim on the floor. Meanwhile, Hotch is watching the video surveillance and notices the UnSub first showed his victim some credentials.

The UnSub's scheme becomes clearer as he's shown knocking on the door and introducing himself as from the FBI before flashing his badge. He's then seen ripping down the shower curtain, probably to wrap his victim in. The trailer ends with JJ showing her own badge, as her voice is heard asking "What if he's one of us?"

"CSI: New York" alum Carmine Giovinazzo guest stars in this episode as Andrew Meeks, a former janitor. But he's not the only familiar face that fans will see, as another popular TV star is also guesting - Marisol Nichols.

According to reports, the "Teen Wolf" star is back as FBI Agent Natalie Colfax. "Criminal Minds" fans were first introduced to the Los Angeles based agent in episode 2, "The Witness." Now she's back to lend a hand as the team searches for a killer who's either connected to law enforcement or wants to be part of one.

Episode 15 of "Criminal Minds" season 11 will be aired on Feb. 24 on CBS.

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