Nathan Fillion Vs. Zombies in 'CASTLE'

Nathan Fillion against zombies? I'm sorry I missed it.

I don't watch Castle, the ABC series starring Nathan Fillion as a mystery novelist who helps Detective Kate Beckett (Stana Katic), but several friends messaged me last night to tell me that zombies -- and zombie walks -- played a pivotal part in last night's episode.

Here's the official episode description:

"Undead Again" -- 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.

Looks like last night's episode of Castle is yet another example of how zombies have crossed over into the mainstream.