After a man flashes customers at an electronics store, it is discovered that someone who matches his description has recently raped three young girls. Captain Donald Cragen orchestrates a movement to catch the rapist, and a rookie cop makes an arrest. Detectives Olivia Benson and Eliot Stabler confirm that they've found their man, but after ADA Jo Marlowe expresses some doubts, it is soon discovered that the so-called rookie may have some secrets of his own.
Despite Grayson's warning, a curious Jules reads the speech without permission and is left crushed when she finds she's not been acknowledged. Meanwhile, Ellie uncharacteristically does something nice for Laurie, and Bobby tries to restrain himself from embarrassing Travis on his big day.
Garcia plays a crucial role in a case when she travels to Alaska with the BAU team to investigate the murders of several members of a small town.
Frankie points out to Mike that his social ineptness has been passed on to Brick, leading Mike to decide that both he and Brick need to be more social, and the Heck family BBQ is the perfect time to try. Meanwhile, Axl volunteers to clean the family pool in an attempt to get girls to stop by and swim and Sue tries to raise money for a local parish because her new friend, Reverend TimTom might be leaving in order to keep costs down
Jay could not be more excited to do nothing but indulge and relax in this tropical paradise, but then an unexpected reality check dampens his plans. Meanwhile, Phil is determined to make this trip romantic for Claire, Mitchell and Cameron have opposing views on whether to sightsee or not to sightsee, and the kids get into a little bit of mischief when left to their own devices.
Jacob and the Man in Black are revealed to be twin brothers. They are raised by a mysterious woman who is charged with protecting the island. As revenge for the murder of their adoptive mother (who killed their real mother), Jacob throws his brother into the source of electromagnetism after being made the island's guardian, which transforms the Man in Black into the smoke monster.
Murdoch is called upon to investigate an exceedingly strange murder. The deceased was found inside a room locked from within with no other entrance. But there's more to the case than that – the victim appears to have exploded and burned, yet there is no trace of an explosion or fire. Before Murdoch can proceed with his investigation, the case takes a bizarre turn when old friend and world-renowned inventor Nikola Tesla appears, announcing cryptically that he is "too late."
Raylan has a few drinks and gets himself beaten up, after being suspended as a Marshall. He pulls himself together and decides to jeopardise his career further by going after the thugs who have been harassing his ex-wife's new husband.
A gunman begins murdering uniformed police officers, prompting the detective to taunt the killer on TV in the hope of inspiring him to turn his anger on him and come out into the open. To his horror, Luther also learns that Alice Morgan has been investigating his past - and is threatening to tell Zoe what she has discovered.
While the firm takes on a case involving a divorce settlement for the wife of a musician who is in a coma, Alicia reluctantly considers a bold move to make sure that Lockhart and Gardner choose her over Cary.
The legendary Ford Sierra Cosworth looks like a family car but goes like a racecar with a motorsport-tuned turbo engine. To find one of these desirable classics at less than £5000 is difficult… but Mike has some clever ideas where to find a car.
After a violent attack on someone very close to Anna, she delivers a message that the Vs don't feel safe and will be leaving, while she also gives a list of possible Fifth Column members to Chad hoping he'll investigate to help in finding them. Meanwhile, Erica and the team try to track down a scientist who may have created a weapon that the Visitors are afraid of.
Adrianna's new romance with pop star Javier continues to blossom, while Navid continues to work up enough courage to tell her how he feels. Jen has taken control of Naomi's finances and puts her on a tight budget, resulting in an instant meltdown by Naomi. Without her credit cards, Naomi is too distracted to realize Liam is in need of support to deal with the departure of his father, so he turns to Annie for comfort. Despite Spence's suggestion, Teddy refuses to end his relationship with Silver, and the two decide to spend the night together. Ivy invites Dixon to spend the summer in Australia with her and Laurel, but the idea doesn't go over well with his parents. Harry and Debbie's problems escalate when she finds out that Harry has been hiding Dixon's gambling issues from her. Meanwhile, Jasper returns to resolve things with Annie.
Harry loses his cool with 3 swimmers that he's forced to rescue just seconds after warning them not to swim in a dangerous area. However, calling them "imbeciles" and "idiots" puts him in hot water.
The NCIS team is on the hunt for a terrorist who escaped Army custody during a secretive transfer in Los Angeles.
Kristin urges Audrina to commit to Ryan, then moves in to get closer to Brody and Spencer causes as scene when he gets angry with Holly at Enzo's party....
Zeek makes his presence known while crashing with Adam and Kristina. Elsewhere, Camille focuses on her art instead of focusing on her husband. Trying to get her father out of debt, Julia enlists the help of her old college flame much to Joel's chagrin. Meanwhile, Amber feels guilty about betraying Haddie and Crosby thinks about settling down with Jasmine and Jabbar.
The team tries to track down a serial killer, while Abby heads south of the border to give a speech with McGee in tow.