April 16th, 2012
01:33 PM ET
When Adam Baldwin showed up to film his guest appearance for Monday night's episode of "Castle," he felt like he was going back home.
"It was like putting on an old comfortable brown coat or worn boots," Baldwin told CNN.
That "brown coat" reference is purposeful. Not only are fans of Baldwin's – and "Castle" star Nathan Fillion's – much beloved, short-lived show "Firefly" called "browncoats," there is also a scene where Baldwin's roguish character, detective Ethan Slaughter, makes off with Castle's brown coat.
"We tried to work in some Easter eggs for the 'Firefly' fanbase," Baldwin said.
While working with Fillion for the first time in eight years, Baldwin said the two instantly slipped into old habits.
"We'd yell 'Summer!'" he said, referring to "Firefly" co-star Summer Glau ("Terminator: The Sarah Connor Chronicles"). "She was our scapegoat - if we flubbed a line she would be to blame," and so they continued that tradition on "Castle."
So, who is Ethan Slaughter?
"[He] uses unorthodox methodology to get the information he needs," Baldwin said. "He runs across Castle as they're investigating the same crime, and for selfish reasons on both their parts, they join forces to solve this particular case. It was nice to turn the tables on Nathan. Slaughter is the grizzled veteran [whereas Baldwin's Jayne answered to Captain Mal on 'Firefly']. It was sweet revenge for Adam Baldwin!"
The "Chuck" actor said that Fillion is just as much of a leader on the "Castle" set as he was on "Firefly" and the subsequent movie, "Serenity."
"That goes to his character. We need more guys like that in Hollywood."
As to any chance we might see Slaughter return in "Castle's" fifth season?
"I don't think I burned any bridges on this guest spot. How's that?"
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