When Ichabod's old nemesis returns from the dead, Ichabod and Abbie turn to Temperance Brennan and Seeley Booth to unlock 18th century secrets using 21st century science.
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.
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.