“Sleepy Hollow” revolves around the life of Ichabod Crane, a soldier and spy in the Colonial Army on a mission for General George Washington, the first president of the United States.
He was the one who killed the Headless Horseman who also killed him eventually. Ichabod rises from his grave more than 230 years later after the Headless Horseman is summoned back from his watery grave by an anonymous entity.
The resurrection of one caused the other to also come back to life as a result of their blood mixing together after Ichabod decapitated the Headless Horseman on the field of battle.
Meanwhile, Abbie Mills, a police lieutenant, started investigating the handiwork of the Headless Horseman after he beheads Sheriff August Corbin, Mills’ mentor, and partner.
She later on discovered that there are two occult groups in Sleepy Hollow – one is good while the other is evil, but both are concerned with the Four Horsemen associated with the apocalypse, which the Headless Horsemen is said to be a part of.
It is because of the killing spree of the Headless Horseman in Sleepy Hollow that forced Ichabod to team up with Abbie, especially when they both learned that they are destined to be the two witnesses and the only ones who can protect the world from the forces of hell.