Fox gets into the spirit of Halloween with a haunting crossover featuring 'Bones' and 'Sleepy Hollow.' The showrunners from both series gave reporters the scoop on the two-hour stunt.

Nothing says Halloween like Sleepy Hollow + Bones + a headless corpse. Or as Agent Booth teases, “It’s Halloween. All bets are off.”

Fox is airing a special two-hour crossover stunt this Thursday, Oct. 29, beginning on Bones at 8 p.m. and continuing on Sleepy Hollow at 9 p.m., as Brennan (Emily Deschanel) and Booth (David Boreanaz) team-up with Ichabod Crane (Tom Mison) and Abbie Mills (Nicole Beharie) for a case.

What brings the two sets of sleuths together? A pile of bones, of course. The discovery of human remains – a 200-year-old headless corpse, to be exact – by the Jeffersonian crew has a connection to Sleepy Hollow. In an un-deadly twist, the skeleton turns out to be an old nemesis of Ichabod Crane – Red Coat Gen. Howe.

Bones Sleepy Hollow Crossover Photo

TJ Thyne, guest star Tom Mison, Emily Deschanel and Michaela Conlin in the special "The Resurrection in the Remains" BONES/SLEEPY HOLLOW crossover episode of BONES airing Thursday, Oct. 29 (8:00-9:00 PM ET/PT) on FOX. ©2015 Fox Broadcasting Co. (Photo: Patrick McElhenney/FOX)

When Pandora (Shannyn Sossamon) unleashes an evil force that resurrects Gen. Howe, the gang is soon fighting off a whole British Army of Walking Dead. That’s a new one for Brennan and Booth, to say the least. But what’s really fun is watching Ichabod and Brennan working together – we’re not sure who’s quirkier!

During a conference call with reporters, showrunners Jonathan Collier (Bones) and Clifton Campbell (Sleepy Hollow) discussed the daunting challenge of mashing up the two Fox favorites:

Can you discuss the challenges you faced when this idea came about? The genres are quite different.

Collier: “It’s intrinsically harder to put Sleepy Hollow in Bones because we don’t acknowledge that the supernatural exists. For our characters, it is not a reality, and for Sleepy Hollow’s, both science and the supernatural exist. So we had to have a story where both elements can co-exist.”

Campbell: “That was a tightrope act they had to pull off and we were able to put our heads together and come up with a terrestrial crime that, on second look, had a supernatural bent that we were then able to take off on in our hour [Sleepy Hollow] and solve on our side of it. It was challenging for those guys to deal with the realities of our show inside of their own.”

Bones Sleepy Hollow Crossover Photo

Nicole Beharie and Tom Mison in the special “Dead Men Tell No Tales" SLEEPY HOLLOW / BONES crossover episode of SLEEPY HOLLOW airing Thursday, Oct. 29 (9:00-10:00PM ET/PT) on FOX. ©2015 Fox Broadcasting Co. (Photo: Tina Rowden/FOX)

What can you tell us about the pairings of Brennan and Crane, and Booth and Mills?

Collier: “It was incredibly fun for us to get Crane onto our show. He’s an educated man but from another century he probably would be more like Brennan than not, if he would’ve been born in our time.”

Campbell: “In regards to Abbie and Booth…They’re both FBI agents. The interesting part for our side was that Booth is a veteran agent…and Abbie is brand-new to the Bureau and has heard of Booth’s name. It was sort of a natural organic handoff from one show to the other using the Bureau connection and the FBI investigation. It really gave us some stuff to play with seeing the veteran sort of help out and support the person new to the job.”

Collier: “And beyond the characters, it worked so well with the actors. You can see it on the screen.”

What was the dynamic like between the co-mingled casts?

Campbell: “It’s always nice to shake things up creatively…these are very clearly defined franchises and when you get an opportunity to mix it up as we did, you can really feel the excitement... the take away at the end is, “Boy, you know I would really like to see them do this again.” And there’s a little bit of wink to the audience that something like that is certainly possible.”

Bones Sleepy Hollow Crossover Photo

Tom Mison and Emily Deschanel in the special "The Resurrection in the Remains" BONES/SLEEPY HOLLOW crossover episode of BONES airing Thursday, Oct. 29 (8:00-9:00 PM ET/PT) on FOX. ©2015 Fox Broadcasting Co. (Photo: Patrick McElhenney/FOX)

Does that mean you would do it again?

Collier: “We’d love it. The whole experience was challenging but extremely rewarding.”

Campbell: “As daunting as the idea was initially, working through it with the Bones team was a great deal of fun, from a writer’s perspective. I would love to do another one.”

The Bones-Sleepy Hollow crossover event airs Thursday, Oct. 29, beginning at 8/7c on FOX.