Wednesday's all-new episode of "Criminal Minds" will be intense as the BAU investigates a suspect with a sick and homicidal sex fantasy.

In the next episode, "Breath Play," the BAU will go on the hunt for a serial killer on the loose in Wisconsin. A preview video also reveals that the killer's "fantasy is 50 shades of pain."

During their probe, the BAU will have to find a tie among the casualties in order to profile and identify the unsub.

CarterMatt also reports the upcoming episode may also focus on Jennifer Love Hewitt's real-life pregnancy since the synopsis hints her character, Kate, will bump heads with her niece, Meg.

According to the official synopsis, "The BAU is called to Wisconsin in search of a serial killer, and the team looks for a connection among the victims for clues to the UnSub. Also, Kate has trouble dealing with her niece, Meg, when she begins acting out."

In other news, fans of CBS' "Criminal Minds" have a lot to look forward in the rest of Season 10, including the return of "CSI" star Marc Vann, reports TVLine. Vann, who played Sheriff Conrad Ecklie on "CSI," will guest star on Episode 18 of Season 10, titled "Rock Creek Park." He will play an FBI agent in the Organized Crime Division who will offer aid during a special investigation.

The first time Vann appeared on "Criminal Minds" was in Season 3's "Penelope."

In addition, TVLine reports that "Rock Creek Park" will precede the show's planned spinoff series, which will revolve around a "globetrotting BAU team that tends to Americans in crisis abroad."

Season 10, Episode 15 of "Criminal Minds," "Breath Play" will air on Wednesday, March 11, at 9 p.m. EST on CBS.

Watch a promo video below.