ABC's Castle is about to feature a special guest star from One Tree Hill, who has signed on to play an intriguing character in the seventh episode of Season 7.

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Tyler Hilton, who played Chris Keller on One Tree Hill, will play Tobias, "a fun-loving resort guest privy to a scandalous secret," according to a Monday report by TVLine. He will guest star in the seventh episode of the season, titled Once Upon A Time In the West.

Hilton recently posted a photo on Instagram of himself (seen above) in his underwear and wearing a cowboy hat. He wrote the humorous caption: "Dear mom and dad, Hollywood is everything I hoped it would be. #Castle."

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The episode finds Castle (Nathan Fillion) and Beckett (Stana Katic) investigating an Old West-themed resort, according to the report, where Tobias is a guest.

Hilton recently guest starred in the CBS event series Extant, where he played Charlie in a recurring role.

In other Castle news, ABC has released a plot synopsis for the fourth episode of the season, titled Child's Play.

In Child's Play, after "an ice cream vender is shot, evidence leads Beckett and Castle to believe that an unknown second-grader may have vital information about the case. Castle goes undercover at an elementary school to try and identify the second-grader but nothing goes as planned."

Undercover episodes of Castle are almost always a big hit with the show's fans, so it is sure to be interesting, and highly entertaining, to see Castle going undercover in an elementary school. This episode airs Monday, Oct. 20.

Castle airs Mondays at 10 p.m. ET/PT on ABC.

Watch the promo for Monday night's episode of Castle below:

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Castle, Television, ABC