Undead Again Castle : Season 4 Episode 22
TV-14 ABC 43m int(0)
Aired: April 30th, 2012 @ 9:00 PM EST on ABC
When Castle and Beckett investigate the murder of a man with human bite marks on his body, Castle's wild theories start flying. But none are as wild as what their only witness insists happened - a Zombie attack. As the evidence pointing towards an undead assailant piles up, the team plunges into New York's Zombie subculture to find the killer and bring him in -- dead, undead or alive