It's already been spoiled that the Castle season 4 finale, "Headhunters" will feature Adam Baldwin as a new cop Rick teams up with, which puts him into the line of fire like never before. Now I'm happy to tease that another Battlestar Galactica alum, Tahmoh Penikett, has landed a potentially recurring roll. Penikett's TV credits include Dollhouse, The Killing and Haven. His character, Cold Maddox, is set to start his run in the emotional May 7th finale, "Always". The details of the role is being kept under wraps, but no worries, I have a couple of spoilery nuggets to wet your whistle. Maddox is described as cold and calculating with a military background. So, tell me what you think the emotional season 4 finale of Castle will bring?