Fans of crime dramas, are you sitting down? This Halloween is shaping up to be pretty special because, in the run-up to the annual spooky celebration, the cast of 'Bones' and of 'Sleepy Hollow' will briefly collide in a one-off crossover episode that will see these detectives collaborate on an unusual case.

Emily Deschanel and David Boreanaz in BonesIs Bones and Sleepy Hollow a match made in heaven?

If you don't know either of these series, here's a brief overview. 'Bones' is set in Washington, D.C. and follows the professional relationship between a forensic anthropologist called Dr. Temperance Brennan (Emily Deschanel), who's remarkably gifted in the study of human remains and works at the Jeffersonian Institute Medico-Legal Lab, and FBI Special Agent Seeley Booth (David Boreanaz). Together, the pair team together to solve various murder cases. 

'Sleepy Hollow', meanwhile, follows on from events in the original Washington Irving story. An 18th century spy named Ichabod Crane (Tom Mison) has risen from the grave centuries after being killed by the Headless Horseman, and stuck in modern day New York he is forced to join forces with a police officer named Abbie Mills (Nicole Beharie) to stop the also escaped Horseman who's now on a killing spree.

This crossover episode sees Crane being enlisted to check out some 18th century human remains at the Jeffersonian Institute, an apparently beheaded skeleton, while at the same time baffling the employees with his wholly anachronistic dress sense and manner of speaking. It's an interesting clash of personalities, especially when the sceptical Booth first meets Crane. 

'[Booth and Crane] don't like each other instantly', Mison told Entertainment Weekly. '[Booth] gets to throw in all of these subtle insults at Ichabod, who is trying to maintain his manners and respond in front of these two ladies. It makes for quite a nice dynamic.'

More: Here's how Tom Mison celebrated Halloween last year

The two-part episode will air on Fox tonight (October 29th 2015).

Tom Mison in Sleepy HollowTom Mison has a new mystery to solve