Ichabod and Abbie learn how to reactivate Pandora's Box, which may be their only weapon against the Hidden One as he prepares to bring about the end of humanity.
While Ichabod and Abbie travel to the Catacombs to find a way to stop the Hidden One, the rest of the team stages a desperate holding action to keep the Hidden One from obtaining supreme power.
The key to a current mystery lies in Ichabod's history with Betsy Ross. Meanwhile, Abbie must choose between Daniel and her career as a Witness, and Jenny tries to form a relationship with her father.
To save Ichabod, who is trapped in the archive with the Hidden One, Abbie must make a deal with the devil. Meanwhile, Jenny hesitates when it becomes clear Joe may have to give up his life to save Ichabod.
A monster attacks Abbie and Sophie during a FBI wilderness training exercise, threatening to reveal the truth about the supernatural to Daniel. Meanwhile, Ichabod finds out more about Abbie's symbol, and Joe and Jenny obtain a fragment of Pandora's Box.
The Jersey Devil commits several grisly murders, but Ichabod and Abbie soon discover that the creature's plan involves the Hidden One regaining his power. Meanwhile, Joe and Jenny hit a hitch in their relationship, and Abbie has to choose between Ichabod and the symbol that kept her alive in the Catacombs.moreless
Jenny meets with Ezra, who wants to help Abbie with her current emotional problems. Meanwhile, Atticus Nevins reenters the team's lives when he demands safe passage out of the country in return for his information on the creature that is stalking Sleepy Hollow.
The Kindred returns to Sleepy Hollow, leaving a trail of death in its path. However, Abbie and Ichabod soon discover that they can't simply exterminate it. Meanwhile, Daniel asks Abbie to return to the FBI, and Ichabod deals with his tattered relationship with Zoe.
A living Gargoyle kills a man at a restored bell tower. However, Ichabod searching for Abbie on the astral plane, so Sophie teams up with Joe and Jenny to deal with the creature. Meanwhile, Pandora offers Abbie a way back to Earth... in return for the Eye of Providence.
While Ichabod continues his search for Abbie, he inadvertently releases a vengeance demon that feeds on desperation. Meanwhile, Sophie continues the FBI investigation into Abbie's disappearance, and Jenny and Joe try to obtain a map that may lead them to Abbie.
The secrets of the Shard emerge, threatening the Witnesses, Joe, Jenny, and Abbie's FBI career.
Abbie is put in charge when Daniel heads to DC, and gets into more trouble when Joe and Jenny's actions against Atticus threaten her career.
Ichabod and Abbie pursue a new monster that can induce extreme paranoid--and death--in its victims. Meanwhile, Abbie orders Jenny to stay away from Atticus, but Joe isn't interested.
Pandora resurrects a foe from Ichabod's past to unleash fear in Sleepy Hollow. To find their opponent's weakness, Abbie and Ichabod turn to their new friends Booth and Brennan for help. Meanwhile, Joe and Jenny discover that the man who is behind the theft of the Shard is an old friend of Joe's father.moreless
Pandora unleashes the demonic creature that was the basis for the Tooth Fairy on the children of Sleepy Hollow. Meanwhile, Abbie tells Jenny about finding their father, and Ichabod continues his quest for American citizenship.
Pandora's newest threat is a killer from Ichabod's schoolboy past. Meanwhile, Joe and Jenny find a new player when they go looking to recover the Shard of Anubis.
Pandora unleashes a creature that seeks to kill those discovering secrets. Meanwhile, Abbie's new boss arrives in Sleepy Hollow, and Joe goes to Jenny seeking answers.
Nine months after the deaths of Henry and Katrina, Ichabod is arrested returning to the U.S. Abbie--now an FBI agent--gets him out and they discover that a new evil has been unleashed upon the world.