Season 4 Episode 21 episode 21

'Castle' Season 4 Episode 21 “Headhunters” 3 More Sneak Peeks

'Castle' Season 4 Episode 21 “Headhunters” 3 More Sneak Peeks

ABC has released three more sneak peeks for this Monday's highly anticipated Firefly reunion on Castle,“Headhunters”. I want to know what your most excited about, so hit the comments!!