Wednesday's all-new episode of "Criminal Minds" will be extremely intense as the BAU go on the hunt for a madman in Los Angeles.

A promo video for the next episode, which is entitled "Protection," reveals that the UnSub will capture hostages and open fire at the BAU crew. "The Mentalist" star Joe Adler will also make a guest appearance in this installment.

According to CarterMatt, the synopsis for the episode reads as follows:

"When shooting victims are found in the Los Angeles area with possible links to criminal activity, the BAU searches for a vigilante UnSub, on CRIMINAL MINDS, Wednesday, April 29 (9:00-10:00 p.m., ET/PT) on the CBS Television Network. Joe Adler ('The Mentalist') guest stars as Danny Lee Watson."

Executive producer Erica Messer also dropped spoilers about the upcoming episode, revealing that the storyline about the suspect who has been kidnapping and auctioning people off online will come to a head. The story will end with unfortunate consequences for Kate, who will be put in a difficult position as she tries to save Meg and her friend.

"By the end of episode 22, we do a mini cliffhanger in that we know that Meg and her best friend are being kidnapped by the guy we saw in the premiere ... [The finale] is our team fighting for one of our own to get her loved one back," Messer told Entertainment Weekly.

In addition, the showrunner teased that although Reid asked Agent Dorian Loker, who was played by guest star Emily Churchill, on a date last month, he will not find love anytime soon.

"She will not be in the rest of this season," the EP told TVGuide.com, adding that the function of the date was to show that Reid has finally moved on from Maeve's death. "It's been two years. Maeve is something that will never go away in his heart. We want him to smile again and we think everybody else does too. The fact that this quirky agent who speaks Russian is somebody he'd like to have coffee with -- good on him. That's a great thing."

Season 10, Episode 22 of "Criminal Minds," "Protection," will air on Wednesday, April 28, at 9 p.m. EST on CBS.

Watch a preview video below.