ABC's hit show Castle will be returning tonight with an all-new episode, titled Need To Know, which will feature Beckett (Stana Katic) and her mentor, McCord (Lisa Edelstein) making the trek to the 12th precinct when the slaying of an 80s TV standout require the feds to get involved.

While fans will surely be happy to see Castle's (Nathan Fillion) fiance permanently back on familiar turf, her trip back to The Big Apple may not go as greatly as she had hoped, according to Wet Paint.

Penny Johnson, who dons the role of Captain Gates, recently chimed in to The Hollywood Reporter on Oct. 3, hinting that Beckett's relationship may get in the line of duty in some way, shape or form.

"If she doesn't [return to the precinct], let's just say there will be some long-term relationship that's going on and somehow the precinct has to get involved with whatever is going on in Washington," she said.

"If she does, [come back] we have to contend with what level does she return to? Will Castle return with her?" Johnson added.

Meanwhile, an FBI agent will reportedly get the competitive juices flowing in the upcoming episode amongst Ryan (Seamus Dever), Esposito (Jon Huertas), and Castle.

ABC's Castle will be airing Need To Know on Monday, Oct. 7 at 10 p.m. EDT. Be sure to keep checking back for more of the latest details on the popular TV series. The trailer for the upcoming episode can be viewed below.

Castle & Beckett's Engagement To Change Overall DNA Of The Show?

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Castle, ABC, Television