With Lucas back within MI5 he reveals that the Russians interrogated him about Operation Sugar Horse, the most secret ongoing spy operation MI5 ever had. If the Russians know about it, then MI5 has a very high level mole. Harry seeks out his mentor, The Spycatcher, to help him find the mole. Ben is undercover with an Al-Qaeda cell; they are planning to bomb London and what looks like a dry run unexpectedly turns live.
Gibbs and his team are searching for a cyber serial killer who takes videos of his victims. The team quickly finds out that the videos of the dead victims are false.
After an encounter with a zombie, Riq meets lone armed survivor Alex. The pair team up and escape the zombies by hiding in an abandoned country house.
Casey faces a hard decision when she learns that Max is planning to go to Cal Tech for grad school and she is offered an internship. She turns to Lauren Conrad (who appears in a dream sequence) for advice. Also, the pledges are put through Hell Week and Rusty is driven to face the challenge no matter what he is forced to do.
DeShawn is determined to make a big splash on the Atlanta social scene with her "Night of a Thousand Stars" gala event, and invites hundreds of people into her private estate for the lavish event. Kim and Shereé bond during a private spa day and enjoy an intimate dinner with their kids, which puts NeNe's friendship with Kim in jeopardy. Lisa's "Wu Girl" jewelry line is taking off and her trunk show is a hit. She inks a distribution deal with jewelry mogul, Steven Zale, and models her jewelry in a glamorous photo shoot for her new brand.
While Eli takes on a lead paint manufacturing case that may take him to the Supreme Court, Jordan is forced to defend his sanity in court. Meanwhile, Eli discovers his father's diary that contains a disturbing revelation.
Ferrari expert and master car restorer Wayne Carini gets a lead on a 1972 Ferrari Daytona Spyder for sale in Denver. Abandoned in a shed in the early '80s, the car has been painted an awful lime green and hasn't been driven for 27 years. It seems like a disaster, but Wayne has a hunch that he knows who the original owner is. With just 48 hours to put together a deal, Wayne and a friend hop aboard a private Gulfstream 450 in the middle of a blizzard and fly to Denver with the hopes of buying this rare Ferrari.
When a girl is found covered in blood and holding the murder weapon that killed her best friend, she becomes an obvious suspect, though she can't remember anything. But Jane, believing she's innocent, engineers a risky maneuver in which she must relive the terrifying events in order to spark her memory.
The team must shift their attention from a case they are working on and hand it over to Martin, after a child is reported to have been kidnapped at a mall.
Vic closes in on Shane, Mara and their sick young son; Claudette dismantles the Strike Team; Pezuela offers Acevada "assistance" for his mayoral campaign; Rita Denton (Frances Fisher) comes on to Dutch; and Billings' ex-wife and daughter are fearful when a registered sex offender moves into their neighborhood.
An ailing man suffers from blackouts and sleepwalks, leading the team to wonder if his sleepwalking is a symptom, or how the man is becoming exposed to something else. When the man's daughter grows ill as well, the team must provide a diagnosis before both die. Meanwhile, Cuddy adopts a newborn but when the birth mother displays a rash, she has to make a decision between putting the mother or daughter at risk.
Casey is in panic mode after the diary that details her unsettling romantic dreams about Truman goes missing. Believing that Derek and Edwin took it, Lizzie and Marti attempt to get the diary back by making their stepbrothers' lives miserable.
Mike teams up with the boys from Bartos Bait & Fish to catch leeches that will later be sold for fish bait. Then it's off to the Green Tripe factory in Hollister, CA where Mike helps make BARF (Biologically Appropriate Raw Food) for dogs.
Alien pods are discovered in an abandoned garage; a retirement-home resident has a deadly gift; a patient wishes to be reattached to his formerly conjoined twin; a power-company employee confronts a scientist who is stealing power to create the ultimate weapon.
Clyde threatens Sarah but they manage to talk him out of it, which leads Sarah Jane to believe that Trueman's control on people can be repressed by persuading them to do something that they do not normally want to do. Meanwhile, using in his broadcast to the world, Martin Trueman takes over each star sign one by one, starting with Gemini - including Rani's mother. The world is in confusion as people are accepting the 'Ancient Lights'.
Desperate to regain her memory, Sam opts to join a clinical trial and starts taking pills for her memory. Sam's memories start coming back, but she doesn't like what she learns about her former self. Elsewhere, someone confuses Dena and Andrea as being a gay couple, which frustrates Andrea and sends her on the hunt to find someone hotter than Dena.
David and Geneva bought their fixer-upper in search of more room for their growing family. But four years later, the renovations are still not completed and Geneva is fed up. David, on the other hand, thinks all the house needs is a little more work and it could be the perfect home for their now family of four. But one of the main problems with the house starts at the front door... if you can even find it. The home's address is on one street, but their "front entrance" is on another street. On top of that, much of the home is cold, and there's a lack of privacy--the kids' room is attached to the master bedroom. Fed up with the dysfunctional layout that lacks a proper front entrance, David and Geneva call upon experts Jillian and Todd for some much needed solutions. Jillian and her design team will transform their house into an open concept oasis, while Todd will convince the family it's time for a new home. In the end, will they love it or list it?
Audrina wants to make things work with Corey, but finds herself torn when Justin drops by Epic. Meanwhile, Stephanie starts having doubts about her new boyfriend when he fails to defend her in front of Brody.
Harry vows revenge by taking down the head of Russia's intelligence service in Britain with the help of Lucas North. Lucas's loyalties, however, are secretly no longer with MI5 and he exploits Harry's trust to help a Russian submarine destroy Britain's communications system, causing financial and social chaos.