Aired: September 27, 2011 | Season: 4 | Episode: 2

Overview
Runtime: 44m
Directed by: Jeff Bleckner
Written by: Andrew W. Marlowe, David Amann
Guest stars: Eric Tiede, Hank Harris, Jamie McShane, Kenneth Mitchell, Maura Soden, Michelle Van Der Water, Valerie Azlynn
Description
When an ex-con is mysteriously slain in an alley, Castle and Beckett believe a vigilante is behind the murder. But efforts to identify their suspect are thwarted when they discover that he roams the city in a Superhero costume -- and may indeed be a Superhero. Can they capture and unmask the killer before he strikes again?