The 100th episode of "Castle" may be airing on Monday, April 1 (10 p.m. ET on ABC), but it's no April Fools joke -- in fact, the consequences of the "Rear Window"-esque case could hit surprisingly close to home for our heroes.
At the cake-cutting ceremony for the milestone episode, The Huffington Post caught up with Nathan Fillion, creator Andrew Marlowe and other members of the show's cast to preview what to expect from the Hitchcock-inspired hour, which Marlowe described as "a champagne glass of an episode," designed with the series' most loyal fans in mind -- especially those who love Castle (Fillion) and Beckett (Stana Katic). Read on for what we learned.Andrew Marlowe (Creator):
- On coming up with the 100th episode: "One of things with the 100th episode is, we wanted to put the lens squarely on the Castle/Beckett dynamic, we wanted to do something that was fun, something that was basically a champagne glass of an episode -- it has a lot of sparkle, a lot of wit. So when [co-writer] Terri Edda Miller and I were conceiving it, we were looking for a story that would allow us to put the lens on our principle cast, instead of having a big thing that drew them all away. So putting Castle in the middle of this is kind of "the boy who cried murder." It's like Michigan J. Frog. When he's looking, he sees stuff, and when Beckett comes over, she doesn't. It allows us to recapture some of the great chemistry we had in the first season. We wanted to do the quintessential episode that could've played in any season. We're really pleased with how it turned out."
- On how the revelations about Castle's father (James Brolin) will impact the rest of the season: "It all ties together. Castle and Beckett got together at the end of last season; when you're in a relationship and you've been in it for a while -- they're coming up on a year -- you start asking questions. I think Castle has to wrestle with who he is, given what he learned from his father. Beckett's wrestling with where she is in the universe, and her choice of becoming a cop now that some of the issues around her mother's death have been resolved. So I think that moves us into an emotional spring for part of our season, where the two of them are feeling their way through what comes next and [asking], 'Who are we?' and, 'What does it mean to be a couple?' and, 'Where are we going?' So I think some big questions are raised and it leads to a very emotional conclusion at the end of the season."
- On the future of the Castle/Beckett relationship: "What we've been doing for the past four years is slowly peeling back who Beckett is for Castle, and now we're trying to peel back who Castle is. He's a guy who doesn't reveal a lot of depth about himself, but you know it's there and you see it in certain scenes. And now, Beckett is gonna be probing as to 'who is this guy under the surface?' We're gonna see some more of that coming up."
- On the plot of the 100th episode: "Castle is a witness to something heinous, but he's having trouble convincing his friends that there's something going down. There's something that stirs within you [in that situation] -- first of all, you have a bit of a 'really, you don't have my back?' moment, and then there's the moment of, 'Then I'll do it on my own, regardless of how I'm injured!' Those are real-life moments. Those are things that we can all relate to. We're not all cops investigating murders, but we all do have moments where you say to your friends, 'I can't believe you're not backing me up on this!' It's reality-based in that way."
- On the Castle/Beckett dynamic: One of the things that Castle loves about Beckett is that she challenges him, constantly, so here they are, butting heads. Castle will not be told what he saw was not what he saw.
- On his involvement in the 100th episode: "We have a really interesting episode. It's "Rear Window." The writing is very Hitchcock-esque, which is very cool, so it's a little different from what we usually do. Nathan's character becomes very helpless and isolated and he's separated from the team and he wants to help the team, but ultimately, he witnesses his own thing and he desperately needs the team, but the team's not there. I can say that my character, along with a couple of other characters, are instrumental in the end of the episode with bringing him out of what he's spiraling into. It's pretty crazy. It's gonna be a fun reveal."
- On what's ahead for Lanie: "Lanie is back to secretly seeing Esposito. She is possibly going to be doing some more scenes with Alexis [Molly C. Quinn] coming down to the morgue. We need to revisit that -- [that's] one of the things everybody wants to see. I want to see it too! It's time. There's so much going on and such little time because the season's coming to an end, but Andrew and the writers are working their butts off to make everything happen."
- On what's unique about the 100th episode: "I think that the 100th episode is going to be a surprise, in that we're gonna see Mr. Fillion in his element ... If you could be a fly on the wall, just you and Nathan, I think this'll be the experience you'll wanna have."
Tune in to the 100th episode of "Castle," "The Lives of Others," on Monday, April 1 at 10 p.m. ET on ABC.