Ichabod finds himself buried alive in a coffin; Abbie is trapped in purgatory; Ichabod's wife, Katrina, has been kidnapped by the Headless Horseman; Capt. Frank Irving is behind bars for a murder he did not commit; and Abbie's sister, Jenny, is among the wreckage of a horrific car crash. Now, with Henry's emergence as the Horseman of War, alongside the Headless Horseman, Sleepy Hollow has never been so close to destruction.

Ichabod Crane and Lt. Abbie Mills concoct a daring plan to try to rescue Ichabod's wife, Katrina, from the Headless Horseman by resurrecting a Frankenstein-like monster created by Benjamin Franklin. Meanwhile, Frank Irving faces new trouble after revealing the true details of his encounter with a demon, and Jenny Mills finds herself at odds with the new sheriff in town.

After a bank robbery turns violent, Abbie and Ichabod embark on a hunt for a mysterious silver coin that has more power than meets the eye. Meanwhile, Captain Frank Irving is put in a position where he must choose between his family and the greater good and the Mills' sisterly bond is put to the utmost test.

Abbie and Crane's search for a missing Sleepy Hollow child reveals a creature akin to the Pied Piper, whose legacy with the child's family extends back to a centuries-old curse.

A woman from Ichabod Crane's past comes to Sleepy Hollow in the form of an un-dead Weeping Lady, aiming to harm anyone in her path. Katrina and Crane learn unsettling things about each other's pasts. Abbie has some unexpected flirtatious encounters.

Sheriff Corbin's son returns from war, but his strange behavior leads Abbie and Ichabod to question his intentions.

Abbie and Ichabod learn that Katrina is in imminent danger and race against the clock to help her.

Crane and Abbie set out to take down a succubus whom Henry has sent out to drain the life forces out of its victims.

A series of mysterious deaths at Tarrytown Psych leads Abbie and Ichabod to discover that an especially surprising spirit is involved.

Ichabod and Abbie set out to find the Sword of Methuselah, the only weapon capable of killing Moloch and ending the coming apocalypse.

Unforeseen sacrifices must be made and loyalties are put to the ultimate test in the fight against evil.

Six weeks following Moloch’s defeat, Ichabod and Abbie encounter an angel, Orion, that they believe can help them. At first pleased by his arrival, the pair discovers Orion – and his true motivations – may not be as benevolent as first assumed. Meanwhile, Katrina searches for the humanity in Abraham.

After the mysterious death of an art restorer at the Sleepy Hollow Historical Society Soiree, Ichabod and Katrina are reminded of a dear friend from their past - Abigail Adams. Meanwhile, Abbie is shocked by someone's visit to the police precinct.

With the help of Ichabod, Abbie and Jenny, Nick Hawley faces off against his evil childhood caretaker, and Captain Frank Irving adjusts to his new... life(?)

While preparing for an auction of mementos and artifacts once belonging to Queen Elizabeth I, the discovery of “The Grand Grimoire” – a rare journal containing spells of forbidden black magic which once belonged to the Royal Court’s “sorcerer supreme” – attracts the attention of Solomon Kent, a powerful warlock who, despite his own magical nature, was responsible for triggering the Salem Witch Trials. Having escaped Purgatory in the wake of Moloch’s death, Kent has come to claim the powerful tome for his own malevolent purposes. Following the mysterious deaths of two auction house employees, Crane and Mills are called in to investigate and, after learning of the mystical book’s recent reappearance, elicit Katrina’s help in their mission. Katrina learns that despite the book’s power, Kent will not be able to avail himself of the spells within until he locates several of the book’s missing pages, and Ichabod and Abbie race to secure them before their foe can... but they may already be too late. Meanwhile, Frank Irving tells Abbie that his soul is “clean” in the hopes it will allay her concerns about his being under demonic control, but she remains understandably suspicious. And Henry, unsure of his new place in the world, struggles to find his identity, while Katrina learns something new – and unsettling – about herself and her powers.

Ichabod and Abbie face demonic creatures that guard a secret crypt and encounter Thomas Jefferson (guest star Steven Weber) in their quest to fight evil. Meanwhile, Jenny learns a shocking secret about Frank Irving.

Ichabod and Abbie fight against those who want to re-awaken a powerful witch coven and Jenny learns a disturbing truth about Frank Irving.

Familiar faces will perish and a key relationship will implode beyond repair.