When Pandora uses her powers to unleash a new form of evil, Abbie and Crane are forced to face their pasts in unexpected ways.

Fear is rampant in Sleepy Hollow when Pandora releases an ancient artifact from her box that can transform an ordinary human into a terrifying figure from the past.

More powerful than ever, Pandora unleashes her most evil force yet. Meanwhile, Abbie and Jenny work together when the latest monster targets the children of Sleepy Hollow.

With Booth and Brennan in tow, Abbie and Crane set out to prove that supernatural forces are at play when a mysterious death plagues the FBI. As Pandora unleashes a force to awaken the dangerous Red Coast General Howe, both teams must find a way to save the town from the British Army of the Undead. Can the power of Booth and Brennan combined with Abbie and Crane be enough to stop Pandora’s evil forces?

The crossover starts on Bones S11E05 The Resurrection in the Remains (I).

When Pandora unleashes an iconic monster to haunt the residents of Sleepy Hollow as they sleep, Abbie and Jenny are tempted to confront a painful part of their past. Meanwhile, Abbie makes a crucial decision for her career and Crane does his best to guide her with wisdom from his own experiences. Will Ichabod lead Abbie to the right decision?

When Reynolds heads to D.C. to discuss developments in the Nevins case, Abbie is left in command. Jenny and Joe deal with unexpected consequences as a result of stealing the shard, which leaves both the lives of the heroes and Abbie's career in great peril. Meanwhile, a new, more dangerous evil force is revealed.

In the aftermath of Jenny and Joe's run-in with Sophie, Abbie is in deep water with Reynolds. Meanwhile, the Witnesses deal with lasting implications of the shard and find themselves in grave danger as they come face-to-face with a greater evil than they could have imagined.

Following Abbie's huge sacrifice, Crane and Jennie find themselves at a loss. In an effort to save Abbie, Crane forms and unlikely partnership and Jenny confronts a former foe.

In the quest to save Abbie, Crane and Sophie are forced to battle a supernatural force targeting the citizens of Sleepy Hollow, while Pandora and The Hidden One only grow stronger. Meanwhile, in an effort to find out what truly happened to her sister, Jenny faces an old foe: her father. Can our heroes solve their most personal case yet?

The Kindred, the Frankenstein-esque creature Abby & Crane used against the Headless Horseman, returns and wreaks bloody havoc on Sleepy Hollow.

When Jenny makes the decision to confront her father, family turmoil from the past rises to the surface. Meanwhile, Atticus Nevins returns to town, bringing more danger than the FBI could have imagined.

Ichabod discovers that the creature that inspired the stories of the Jersey Devil. Meanwhile, Joe and Jenny reach a possible hurdle in their relationship.

On an FBI team-building day, Abbie and Sophie come face to face with a monster that may finally blow their cover with Reynolds. Meanwhile, Jenny and Joe find themselves in possession of something precious and Crane discovers that the symbol from the Catacombs may be more important than he realized.

After a supernatural event takes the Witnesses by surprise, both Crane and Abbie are forced to work alongside their most hated foes yet. Meanwhile, Jenny and Joe struggle to salvage their relationship, as they continue to battle their own internal demons.

As The Hidden One grows stronger, Crane must examine his past with Betsy Ross to find the key to stopping him. Meanwhile, Jenny wonders if she can ever have a relationship with her father, and Abbie faces a hard decision as things with Reynolds become more strained.

With a single day left before The Hidden One regains omniscience, Abbie and Crane must do the unthinkable in a last-ditch effort to save the world. Meanwhile, Jenny, Joe and Sophie devise a plan to stall as the Witnesses work.

After a startling discovery, Abbie and Crane realize what they must do in order to make Pandora’s box complete again. Meanwhile, the team works tirelessly to stop The Hidden One, before he destroys all of humanity. Can the Witnesses succeed with the fate of the world in their hands once again.