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When Jennifer Beals comes to Castle as part of a February sweeps two-parter, she will be more than just one of Rick Castle’s old flames.

When Castle (Nathan Fillion) and Beckett (Stana Katic) discover a murder victim who was apparently murdered by a rogue CIA agent, they quickly find themselves in the middle of a much larger investigation, led by Beals’ Sophia Conrad.

“She is a CIA agent and, as we know, in Richard Castle’s first series of books, a female CIA agent figured prominently,” creator and executive producer Andrew W. Marlowe tells TVGuide.com. “So, of course, it would lead us to ask: Is Beckett Castle’s first muse?”

Naturally, Beckett learning that she isn’t Castle’s first will leave Beckett with lots of questions about the will-they-won’t-they couple’s future. “Beckett has to wrestle with where she thought she stood in Castle’s life and where she might really stand in Castle’s life,” Marlowe says. “I think it’s natural in a situation like that to feel threatened to some extent, and to measure yourself up.”

“What [Sophia] meant to Castle at the time … and whether or not it makes Beckett feel any less important in Castle’s life, are all things we’re dealing with,” he continues. “Those are questions that Beckett is trying to have answered without exposing her feelings too much.”

For Katic’s part, she believes her character will also be a little disturbed by Castle’s repeat behavior. “When you find out that the guy has had other muses before you, it’s not like, ‘Oh, geez, am I muse enough?’” Katic says. “It’s more like, ‘Some guys have foot fetishes – is this your thing? You just follow women around and tell them they’re your muse so that you can get in their pants?’ I think that’s the confusion there. ”

So, could this bombshell set off other explosions in Castle and Beckett’s relationship? After all, both of them are already keeping big secrets from one another.

“I think it serves as a bit of a touchstone for them,” Marlowe says. “It certainly brings up stuff in both of our characters about how they’re handling the relationship and getting a sense of what they want, what they’re afraid of, and what they hope might happen.”

Castle airs Mondays at 10/9c on ABC. The two-parter begins on Feb. 13.

View original Exclusive: Castle Boss and Stana Katic Dish on Castle’s First Muse at TVGuide.com

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Any more scoop on Castle‘s two-parter? — Christine

ADAM: As with the show’s previous two-part episodes, there will be crazy stunts and big action set pieces. “We filmed a stunt, and we had to be fitted for wetsuits,” Nathan Fillion tells us. But as much fun as it is to imagine Fillion and Stana Katic frolicking in the surf, stripping off their scuba gear, we hear the suits figure into a scene of a much more treacherous aquatic variety.

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Castle
Episode 4.17 is called “Once upon a Crime”

Guest staring in the episode is Charlotte, a survivor of a serial killer. A shocking connection to the other victims will come to light!
Look out for many victims in an episode full of deaths…

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Daddy Issues Galore! |Bones and Castle have more in common than just crime-solving and angsty romances. They also have fathers that are about to come into play. Bones exec producer Stephen Nathan tells me that after the show resumes its season in the spring, Ryan O’Neal will return as Brennan’s dad, Max. Might he, as some speculated, solve the parents-to-be’s child care sitch? “He could help out…,” Nathan hinted. Meanwhile on Castle, series creator Andrew W. Marlowe confirms there still is a plan to shed light on Rick’s father “sometime in February.” Over on ABC’s Revenge, William Devane is due to show up as family patriarch Edward Grayson, and suffice it to say, that father-son dynamic isn’t hearts and flowers. As Henry Czerny (Conrad) puts it, “For a character to show up on Revenge and not have a complex, slightly discomforting relationship with people would be impossible.” What brings about Edward’s visit? “There is only one real answer to that question: You’ll have to watch the show,” Czerny says. “It’s so secretive, I’d have to kill you first and then tell you.”

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I hear there’s going to be a kiss in Castle‘s 1940s film noir episode. Is that true? — Erin

ADAM: After chatting with Stana Katic, my money is on a kiss… and much, much more. “What fans will see is probably the fulfillment of what most any fan would like to see happen with the Castle and Beckett relationship,” Katic says of the episode, in which Castle daydreams about a detective who falls in love with a gangster’s moll (played in Castle’s fantasy by Beckett, of course). “Fans will be seeing the ultimate expression of love for those two characters.” Ultimate expression of love? Is that what the kids are calling it these days?

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A new challenge will unleash new emotions between Castle and Beckett in the second half of ABC’s faultlessly fun crime drama, but it’s probably less romantic than you might think it is. (Or is it?)

While chatting about what Castle fans can expect from the next batch of new episodes, executive producer Andrew Marlowe said the show’s reality TV-themed episode, which will feature a guest spot from White Collar and One Tree Hill alum Hilarie Burton, will find the partners in a situation they’ve never experienced before: sharing custody of a four-legged friend. “There’s some fun to be had with the Castle-Beckett relationship [because] our victim is a celebrity dog-show host and famous dog trainer. And in the aftermath of his death, his beloved golden retriever is left family-less. So Castle and Beckett get to enjoy sharing custody of the dog and I think it brings out stuff in their relationship that’s a lot of fun,” Marlowe said.

The swoon-power of attractive men interacting with adorable dogs can not be understated, and Beckett will be no exception, says Marlowe, especially since Castle’s conduct will reveal a lot about the type of man he is — and the kind family man he could be. “Don’t you think a lot of women do that? Don’t you think Kate would be paying attention? I would think so,” he hinted.

But before that episode, airing later this month, Marlowe dished on tonight’s episode, which will center around the wedding of Seamus Dever’s character, Ryan, and his girlfriend, Jenny (played by real-life wife Juliana). “It’s a fun episode because we get to check in on where all the relationships are,” said Marlowe. “It helps that we get to see these relationships through the lens of our victim. He’s a lothario, a womanizer. And so his relationship – going out and picking up woman – is subject for conversation. Also, along the way, we learn a secret about Jenny that threatens to derail the wedding.”

So is heartbreak in store for Ryan? You’ll have to watch tonight to find out for sure, but in the meantime, Marlowe offers a bit of assurance. “I think we keep it relatively poppy and enjoyable, and we do have some really fun moments between Castle and Beckett in it.”

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‘CASTLE’: THREE TEASES FROM EP ANDREW MARLOWE!
One of my favorite things about Spoiler Room is that I get a chance to preview for you a lot of the fun things to come here on InsideTV, and here’s yet another: Yesterday, I hopped on the phone with Castle EP Andrew Marlowe, who talked about the second half of the season. And while you can expect a full report on our chat over the next few days (good stuff!), here are three bits I’ve pulled to entice you for the time being!

+ Another kiss coming?
As one of you pointed out in an e-mail to me, last January, fans were treated to a kiss between Castle and Beckett. So, I posed the factoid to the ever-coy Marlowe, while shamelessly fishing to see if there was something coming up to be equally excited about. “I think we can be treated to something, if not at that level, close to that level — in terms of movement and complication,” he teases.

+ Another high-stakes two-parter!
One of my favorite episodes of Castle last season was the two-part dirty bomb episode that guest-starred Heroes alum Adrian Pasdar. This season, Jennifer Beals will guest in another two-parter as a CIA agent (with ties to Castle!) who will allow the writers to “do storytelling on a grand scale.” “We have some folks here who spent some time in features and we want to try to bring that movie mentality to TV as best we can,” he says. “I think it will be as explosive as last season. Certainly, I’ll say, we were dealing with a dirty bomb so explosive is a good word for last season. This one will be equally high stakes.”

+ Finale planning in progress
Last season’s Castle finale was, for yours truly, the best episode of the series. So how does one top that? Simple: You don’t. “You try to do something different,” clarifies Marlowe. “If you’re doing the same thing, only better, it still gets a little bit familiar. We always like to keep the audience a little bit on their toes, so we’re conceiving the last couple of episodes — what can we do that’s really compelling in a way we haven’t explored on the show yet?”

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Castle | Throughout the intensity of “Kill Shot” and the flirty fun of “Cuffed,” one can’t be blamed for forgetting that there are still a pair of potent secrets being kept — that Rick purposely waved Beckett off the unsolved mystery of her mother’s murder, and Kate remembers Rick’s season finale “I love you.” Castle’s secret “will resurface” by season’s end, series boss Andrew W. Marlowe tells me. And at the worst possible time, might we assume? “Well, we wouldn’t be dramatists if it came at the best time,” he answers with a wink. “And I will tell you that it will have an impact on their relationship.” Want a scooch more angst, Caskett ‘shippers? Well here it is: “Beckett’s secret might resurface even earlier,” Marlowe teases.

Source: here