[3] Pandora reanimates General Howe and his soldiers as revenants, sending them to march on Sleepy Hollow during Halloween.

Aided by Abbie's FBI contacts, Special Agent Seeley Booth (David Boreanaz) and Doctor Temperance "Bones" Brennan (Emily Deschanel), they trace the bones to an underground tomb beneath the Capitol, which was supposedly built for Washington and contains a prototype version of Greek fire, which Brennan mistakes for napalm.

Although aware of Pandora's role in Howe's resurrection, Ichabod and Abbie are unaware that another flower has bloomed on her tree.

On July 15, 2015, it was announced that Nikki Reed had joined the cast in a series regular role as Betsy Ross, an old flame of Ichabod.

[26] Also joining the cast is Shannyn Sossamon who is set to play Pandora, a mysterious new presence in Sleepy Hollow who seeks the assistance of Ichabod and Abbie.