In this first look at Castle Season 4, Episode 22: "Undead Again," Castle, Beckett, and Perlmutter get the shock of their lives when their "dead" murder suspect (Kyle Jennings) pops straight up on the examination table and proceeds to hightail it out of the morgue.
And the best part? He's dressed in head-to-toe zombie garb.
Naturally, Castle's loving every second of it, and even asks the cranky medical examiner if there's any way to prove that Kyle is, in fact, a zombie.
Watch the clip below!
As entertaining as it all is, we can't forget there's a murder to solve. Kyle's teeth match the bite marks and the blood on his clothes came from the victim. According to Perlmutter, he's definitely their guy.
But the question remains: Was Kyle simply involved in a "Thriller" flashmob gone wrong, or have Castle's wildest dreams come true?
Tune in on Monday, April 30, 2012 at 10 p.m. ET on ABC to find out!
Lindsay Dreyer is an editor at Wetpaint Entertainment. Follow her on Twitter @LindsayNYC.