Abbie and Jenny investigate strange suicides at Tarrytown that may be connected to their mother Lori. Meanwhile, Katrina realizes the nature of the baby and prepares to banish it back to Purgatory.
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
Corbin's son Joe returns from overseas after receiving an honorable discharge after his platoon is wiped out in a bizarre attack. Ichabod and Abbie soon realize that something is wrong with him. Meanwhile, Henry tells Irving that there is a way for him to free his soul, but it has a cost that Irving may not want to pay.moreless
A ghostly spirit, the Weeping Lady, kills Ichabod's friend Caroline. After it attacks Abbie, Ichabod realizes that the ghost is going after his loved ones... and Katrina is her next intended victim.
When a child in Sleepy Hollow goes missing, Ichabod and Abbie realize that a Pied Piper-like creature that serves Moloch is responsible.
Ichabod and Abbie discover that Henry is trying to spread a curse of violence, unleashing the darkness in individuals so that they kill. Meanwhile, Jenny discovers who was responsible for her mother's imprisonment at Terrytown, and Frank learns the truth about his lawyer.moreless
To defeat the Horseman, Ichabod and Abbie seek out a patchwork man that Franklin and the Sisterhood built to oppose Moloch's servants. Meanwhile, the new sheriff arrests Jenny and Frank explains that demons killed his supposed murder victims.moreless
With Ichabod buried alive and Abbie trapped in Purgatory, Ichabod's son, the Horseman of War, has free reign over Sleepy Hollow... and soon, the world.
While Captain Irving faces the ultimate test of his loyalty, Ichabod and Abbie find a secret passage within Washington's Bible that reveals the truth about the First President's death.
Abbie and Ichabod must find a way to save Abbie's sister, Jenny, who has been possessed by an evil spirit.
While attempting to communicate with Katrina in Purgatory, Ichabod and Henry Parrish unwittingly unleash a new evil.
A Colonial house from Ichabod's era may hold they key to finding a missing person... and a secret from Ichabod's past.
Jenny returns to Sleepy Hollow to help Ichabod, Abbie, and Captain Irving against the Horseman, only to realize his true motive wasn't what they believed.
As Ichabod and Abbie deal with the Horseman as it seeks its skull, Abbie gets an unexpected visit from Andy Brooks.
Ichabod disappears and Katrina contacts Abbie in her dreams to warn her that the Headless Horseman is returning, and that she should seek out a reclusive man, John Parrish. Meanwhile, Ichabod encounters a figure from his past.moreless
Ichabod and Abbie are called in to investigate the case of an unidentified boy who has turned up in town. As they investigate his background, they discover a surprising mystery.
Jenny Mills escapes from the institution and Ichabod and Abbie set out to find her before their enemy does. In the process, they learn more about the demon they are facing.
The Sandman, another member of the army of evil, tortures the people of Sleepy Hollow by infiltrating their dreams and turning them into nightmares. When the Sandman targets Abbie, she must seek out her institutionalized sister, Jenny, and face her past.moreless
While still adjusting to his 21st century reality, Ichabod and Abbie continue on their quest to clear up Sleepy Hollow's mysteries. After a vision from Katrina, the two set out to look for a witch from the 1700s. The witch has been awakened and is intent on destroying Sleepy Hollow. Despite what happened to him, Andy Brooks is back and pursuing his own agenda.moreless
As SCIU threatens the nascent Abnormal "Homeland" (with a deadly weapon partly designed by Nikola Tesla), both Magnus and Caleb come under "friendly" fire. Cornered and determined, Magnus responds with a daring move no one - on either side - sees coming.moreless
Magnus is asked to help broker a peace agreement between Caleb, a Hollow Earth insurgent leader, and the world's governments - an agreement whereby Abnormals would be permitted to settle on the surface. Preparing to take military action against the Abnormal forces, Addison "drafts" Will back into the federal government, further dividing Team Sanctuary.moreless
Seeking to outrace the SCIU (who are attempting to capture a rare, legendary Abnormal), Magnus and Will are captured, injured and trapped in a Bolivian cave-in. Alone, the two friends struggle to survive - as they confront who they are and who they've become.moreless
Kate returns from Hollow Earth with word that insurgents are about to strike an above-ground target - and may have inside help from a trusted member of Team Sanctuary.
Just when Magnus thought Adam Worth was gone forever, she and Tesla become trapped in a virtual Sanctuary, where they are attacked by an avatar of Worth - who is determined to enter the "real" world.moreless
When a previously unknown Abnormal attacks Abby, Magnus and Will attempt to communicate with the creature using music - while Henry and Gavin retrace Abby's steps to find out what happened.
Team Sanctuary investigates a mystery on the high seas when the shipwrecked crew of a Bering Sea icebreaker murders the Abnormals on board and then turns on each other.
While Magnus deals with two ne'er-do-well flying Abnormals who entangle her in a wild scheme, Will takes a road trip to Monrovia - where he is unsettled by personal revelations and temporarily blinded during a riot.moreless
Magnus and Henry attempt to infiltrate a secret Abnormal testing facility run by Homeland Security and encounter an old friend whose loyalties are once again in question - Nikola Tesla.