Mary and Countess Marburg keep up appearances while continuing their covert battle for Salem.
Countess Marburg arrives in Salem and threatens Mary's stronghold on the city.
John reveals himself to Cotton as Mary tries to stop the Countess from reaching Salem. Dollie decides to save Isaac as Anne continues to resist Hathorne's advances.
Anne explores her supernatural side, while Mary receives a chilling warning.
Mary hopes to appoint one of her own for the position of Magistrate but Hathorne and John Alden have plans of their own. Mercy forces Dollie to help in her revenge-quest against Mary Sibley as Cotton and Anne find their return to Salem blocked.moreless
Mary takes swift and drastic action against Mercy and the other rebellious witches. While Dr. Wainwright believes Isaac to be both the source of the plague and the key to its defeat, some of his other directives to combat the plague raise some concerns among the Selectmen. John Alden continues to put his plan to wipe out the witches in motion as Mary prepares for the comet's arrival. Anne Hale's unforeseen journey leads to an encounter with the Countess; a meeting which proves most informative for both of them.moreless
As a result of the witches' Grand Rite, a mysterious plague descends upon Salem. Dr. Wainwright, a man of science, arrives in Salem to study the plague and believes the best hope of ending it is by discovering its origins. Mary enjoys a limited reunion with her long lost son and comes to learn the fate of her former lover, John Alden, or so she thinks. Meanwhile in Boston, a witch from an ancient order becomes intrigued with Salem's plight.moreless
Gerald Crane claims another victim and Jim and Harvey try to track him down. Meanwhile, Bruce insists on going on his yearly hike alone, Fish wakes up in a strange place, and Falcone negotiates with Maroni to keep Oswald alive.moreless
Brick abducts three city alderman and demands that the mayor remove the police from the Glades. With Oliver gone, Arsenal and Diggle are all that stands between the crime lord and control of the district. However, Laurel insists on helping them, carrying on her sister's legacy as Black Canary. In the past, Maseo reveals to Oliver that he will do anything to save his family.moreless
Henry brings in a doctor to monitor Katrina's condition after her sudden illness. She manages to escape and Ichabod finds her, and they realize that Moloch has a new plan to manifest on Earth. To stop him, Ichabod reaches out to Henry to use his powers to save his mother.moreless
As Slade unleashes his wave of Mirakuru-enhanced soldiers on Starling City, Oliver and his team prepare to take them on. Meanwhile, Malcolm returns to town to meet his biological daughter.
The town of Willoughby has been turned into a reeducation facility, and Doyle makes things difficult for Tom.
A villain nicknamed the Clock King stalks Starling City, committing precision crimes. Meanwhile, Laurel hosts a dinner party for her family but things go badly, and on the island Sara befriends a dying pilot.moreless
Stephen and his fellow ULTRA trainees are given a test by Jedikiah to determine their worthiness as Agents but not everyone is happy to work as a team.
Cara is faced with a visitor from her past and John works with a new breakout while Russell is sent on a dangerous recon mission that could force a clash between different groups of Tomorrow People
After Stephen breaks ULTRA protocol during a training exercise, Jedikiah's mysterious boss insists on meeting him. After learning Jedikiah is unable to help him Stephen turns to John who is only interested for selfish reasons.
Elsewhere Cara and John disagree on a dangerous plan when some of The Tomorrow People become desperate to attend a party in the outside world. And when Stephen again bails on plans with Astrid she decides to find out what he is really up to.
Oliver goes after China White and her new partner, Bronze Tiger, when they interdict shipments of medicine intended for a hospital in the Glades. Meanwhile, Officer Lance captures Roy and Thea gives her boyfriend an ultimatum, while Laurel continues her hunt for the Arrow.moreless
Annie insinuates herself into the FBI's investigation of Seth's death. When FBI Agent Vincent Rossabi tells her that traces of skin were found under Seth's nails, Annie has only a small amount of time to cover her tracks. Henry offers Annie the opportunity of a lifetime.moreless
Alex, broken by Amanda’s programming, her inability to save everyone, and her role in tragic events at Division, reverts to her old behavior and lashes out violently. With most members of Division dead or scattered, Nikita and Michael try to sift through the remains of Division to determine who and what can be salvaged. To make matters worse, they must act quickly, before the President realizes what has happened. Memories of Division’s glory days haunt Nikita and Michael, and Birkhoff struggles with his own personal losses.moreless
Miles needs to stop a mad bomber while Rachel starts her quest to turn the power back on for the rest of the planet.
A new vigilante, The Savior, stalks The Glades, killing those that he believes have wronged the residents and broadcasting their deaths online. When The Savior explains that he was inspired by The Hood, Oliver sets out to stop him. Meanwhile, Quentin comes to accept that Dinah is telling the truth and Sarah is still alive, but Laurel isn't so sure.moreless
Oliver and Diggle are at odds when Diggle's former commanding officer is next on the list. Meanwhile, Thea notices when Moira and Malcolm spend time together, while Tommy and Laurel have dinner with Tommy's father.moreless
Sam asks a friend, hunter Martin Creaser, to track Benny just to be on the safe side. However, when Martin gets word of a vampire kill in Benny's neighborhood, he takes things into his own hands, forcing Dean to make a tough choice.moreless
Owen is freed from a Russian prison by Anne, a rogue Division agent working for Amanda. He manages to escape Anne's clutches and gets a message to Nikita to let her know that he's free. Once Nikita finds Owen, he is surprised to hear that Nikita is once again with Division but returns to Division headquarters with her. Though Michael and Ryan aren't certain Owen can be trusted, Nikita stands by her friend.moreless
The team races to stop Stanton's plan to activate the mini-stims across the continent. Meanwhile, a wounded Rosen seeks revenge for his daughter by going after the Alpha personally.
While Rosen interrogates an Alpha prisoner, Gary and Bill try to rescue Skylar from Parish.
Kat returns to the team as they set out to find Stanton's secret weapon... and protect him. Meanwhile, Senator Burton challenges Rosen's methods of fighting rogue Alphas.