05/01/2012 06:14 am ET Updated May 01, 2012

'Castle' Zombie Episode: Killer Walker On The Loose (VIDEO)

On what some critics are calling one of the best "Castle" (Mon., 10 p.m. ET on ABC) episodes ever, Castle (Nathan Fillion) and Beckett (Stana Katic) investigated a killer zombie on the loose Monday night.

No, not a "Walking Dead" killer zombie, but rather a drugged and costumed aficionado of zombie walking games. (Who knew they were so popular?)

To get the suspect to confess, Castle dressed up as the killer zombie. Cue lots of hilarious lurching and groaning from Fillion.

Check out HuffPost TV's interview with "Castle" boss Andrew Marlowe, in which he explains how the zombies helped bring Castle and Beckett closer together.

Watch more "Castle" adventures on Mondays at 10 p.m. ET on ABC.

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