Bones exclusive clip: The victim is meant to be you

Class is in session — and it's terrifying.

In this trailer from the Bones season finale, the team finds a skeleton in an abandoned building, arranged in what Booth (David Boreanaz) calls a "classroom from hell." All signs point toward the serial killer known as the Puppeteer, though Cam (Tamara Taylor) would rather call him something cuter.

"New rule: Serial killers don't get cool or frightening nicknames," Booth agrees.

But this killer doesn't need a nickname to inspire fear; the skeleton does that for him. When Brennan (Emily Deschanel) examines the body, she notices something eerily familiar about the clothes — they're hers. Check out the trailer below.

The season finale of Bones airs Thursday at 8 p.m. ET on Fox.