ABC's hit crime drama Castle continues to bolster up its already solid cast with guest stars, as they'll be bringing in two more in actors Billy Miller and Alicia Lagano.

The two actors will be used in episode 4, which will revolve around a crisis with hostages, according to TVLine. The respective installment will be titled Number One Fan.

Miller is best known for his work on the soap, The Young and the Restless, will play a hot-tempered Wall Street banker by the name of Mickey Gerhardt, stated Soaps In Depth.

Fans will be most familiar with Lagano for her time on The Client List. She will don the role of a character named Emma Briggs, a fugitive who's on the run from the law. Lagano's character will be taking a group of people hostage. However, Emma is a wanted woman by law enforcement even before she commits the act. Interesting enough, Emma wants Castle (Nathan Fillion) as the negotiator for the serious situation.

Executive producer Andrew Marlowe briefly touched on the storyline to GiveMeMy Remote.

"Castle is enlisted in a hostage crisis as a negotiator because the woman doesn't trust police, and she's kind of his number one fan," he said.

More on recent Castle castings

ABC's Castle will be returning on Monday, September 23. Keep checking back for more of the latest details on the ABC series. A fan-made video for season 6 can be viewed below.

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Castle, Television, ABC