The Doyles start trailing a potentially cheating husband to find he deeply loves his wife but is in deep trouble with some menacing criminals and smugglers; as Nikki moves forward with her new beau, Jake and Leslie take it to the next level.
Grylls is in a post-disaster urban city scenario and he must survive. His thirst to live and survival techniques modified for a city environment keep him alive in a concrete wasteland in Gdynia, Poland.
The BAU follows the mental decline of a con artist whose schemes have become so complicated that he begins to eliminate the people involved in them.
Claire feels slightly inadequate when her old friend, Valerie, visits and is nothing like Claire remembered. Meanwhile Jay has an unsettling locker room moment when he and Cameron go play racquetball, and Mitchell tries to help Gloria with some legal problems
Shin Young battles workplace politics with Min Jae's help, while Boo Ki confronts the wife of the man she's dating.
A hot tennis instructor gets between Ellie and Jules, while Laurie turns to Travis for advice, and Andy and Grayson try to cheer up Bobby after a fresh heartbreak over Jules.
Wilhemina is livid when she lays eyes on drag queen impersonator - Wilhediva Hater. Betty and Daniel go through a rough patch as she wins an award for her blog. Daniel has the press hot on his heels. While Marc is pleased with himself when a famous director does a photo shoot with him.
Deputy Chief Steven Seagal and his team rush to the scene of a man killed in a drive-by. Minutes later they race to another shooting: a man found dead in his car. Two homicides in less than an hour puts the unit on high alert and when they catch four young men out late, Steven has some stern words. But he gets down right harsh, the next night, when he finds two of them carrying drugs. Steven has to get back to Hollywood, it's time to make his next movie.
Jack, Sawyer, Kate, Miles and Hurley, struggling to save Sayid, face an ancient secret. Meanwhile, a fake Locke exits the chamber to everyone's awe.
Alex's lack of commitment to the team gets him demoted to special teams. Meanwhile, Craig suspects Denise is having an affair and Sammy leads a mob of angry cheerleaders looking for revenge on all the college guys who have wronged them.
Mike creates some concrete counter-tops and fire pits in Moss Landing, California and then reminisces about the scariest job he's ever done.
A crime scene poses a national security risk when the LA team discovers the location was used to create a deadly toxin which is now missing.
When the farmer gets sick, the team must help fill Umi City's milk order.
The team finds themselves in a race against time when a terrorist group threatens to detonate a "dirty bomb" in the D.C. area.
When June's granddaughter suffers renal trauma, Neal stumbles upon a cruel scheme to harvest human organs and brings the case to Peter.
Marilyn Bowman begins her first day as Mayor, only to discover her husband was cheating on her with Heather Weather. The Prosecutor "Big City" arrives in town and proceeds to insult everyone he encounters.
Tensions are high as Peter's appeal begins while Alicia has to defend a wealthy client who doesn't seem that innocent, even after he's found not guilty of murdering his wife. Meanwhile, Diane takes precautions when a prisoner she put in jail is to be released from prison.
Two outcomes of the detonation of the hydrogen bomb are presented. Flight 815 lands safely at LAX, where Kate escapes from the marshal and Jack learns that his father's body was lost in transit.
The owner of "The Stag's Head", a restaurant and bar undergoing renovations, calls CPD in when paranormal activity starts to scare away employees and brings construction to a halt. Ron and the team quickly learn that the stories have merit and spend the night chasing footsteps and disembodied voices throughout the location. Homicide, construction and intelligent interaction make The Stag's Head one restaurant sure to benefit from the Chicago Paranormal Detectives.