'Castle' adds 'Battlestar Galactica' alum Tahmoh Penikett

The "Castle" Season 4 finale is adding a familiar face - "Battlestar Galactica" and "Dollhouse" alum Tahmoh Penikett, reports TV Line. The role is being kept tightly under wraps for now, but his name is Cold Maddox, he has a military background and he's apparently cold and calculating.

The season finale is titled "Headhunters" and has already announced it will feature Adam Baldwin ("Chuck") as a new cop Castle teams up with, which puts him into the line of fire like never before. Since Castle is teaming up with someone new, perhaps Maddox is there to recruit Beckett for something, since a "headhunter" sometimes means a person trying to poach someone to a new job.

And the role may not be relegated to the season finale, as it is "potentially recurring." Either way, we're excited to see Penikett back on screen - Helo forever! What do you think, "Castle" fans? Are you excited?