Castle to Host Firefly Reunion With Nathan Fillion and Adam Baldwin
As first reported by TV Guide Magazine, Baldwin will guest-star in a spring episode of Castle as a “rough-and-tumble” detective named Ethan Slaughter. (John Casey would approve, no?)
Slaughter is said to show Castle a dirtier side of law enforcement, one that gives him a new, dangerous perspective on future cases that will ultimately put the mystery writer in harm’s way by season’s end.
Baldwin and Fillion also starred together in Firefly‘s 2005 big-screen foray, Serenity.