On an upcoming episode of “Castle” this season, we are going to see a long-awaited reunion of two people that we already know rather well courtesy of their time together on “Firefly” many years ago: Nathan Fillion and Adam Baldwin.

So how is this really going to go? Speaking to Entertainment Weekly, Fillion had this to say about geting the opportunity to work with Adam’s character, whose last name just so happens to be Slaughter:

“I’m really excited about it. [Slaughter is] very tough — very rough and tumble. He’s working on a case that Castle wants to be a part of, but he’s not an easy man.”

“Firefly” alumni often visit each other’s new shows on some occasions, as Summer Glau guest-starred once on an episode of “Chuck” as a Buy More Employee. [SOURCE]