Get a First Look at the Bones and Sleepy Hollow Spooky Discovery (VIDEO)

Rob Moynihan
David Boreanaz Emily Deschanel Bones Sleepy Hollow Exclusive
Kevin Estrada/FOX

Fox is serving up Halloween tricks and treats this Thursday when its long-running procedural Bones and supernatural thriller Sleepy Hollow join forces for a two-hour crossover event.

RELATED: Go Behind the Scenes of the Bones and Sleepy Hollow Crossover

So how exactly do these unlikely worlds meet? We get an inkling in the exclusive clip below, when Dr. Temperance Brennan (Emily Deschanel) and the Jeffersonian team have been called to investigate a decaying corpse found in an old church. Upon arrival, they also discover an ancient mortsafe—a coffin designed to prevent grave robbing—engraved with mysterious symbols. But what's inside might actually interest Sleepy Hollow's FBI agent Abbie Mills (Nicole Beharie) and her quirky counterpart Ichabod Crane (Tom Mison): a headless skeleton dating back to the eighteenth century.

The crossover event airs Thursday, October 29 with Bones at 8/7c and Sleepy Hollow at 9/8c on Fox.