'Castle' casting scoop: Nathan Fillion reunites with fellow 'Firefly' alum Gina Torres

Browncoats unite ... again!

Nathan Fillion will be joined by another one of his "Firefly" co-stars on "Castle": Gina Torres is guesting in this season's 14th episode, reports TVLine.

Torres, who now plays the icy, shrewd managing partner of a high-powered law firm on "Suits," will square off against Castle and Beckett (Stana Katic) as a devious fashion mogul. Her character, Samantha Foster, also happens to star on a "Real Housewives"-type reality show. (Fingers crossed for more "Swan Song"/"Spinal Tap" on-camera hilarity!)

Last season, "Firefly" alum Adam Baldwin also paid a visit to "Castle." His episode was packed full of Browncoat Easter eggs, so expect more winks when Captain Tightpants reunites with his second-in-command.

What other "Firefly" actors would you like to see on "Castle"?