One of the stars of Teen Wolf is about to make a guest appearance in Castle season 6.

Beckett To Be 'Killed' in Dangerous Undercover Operation?

Teen Wolf actress Arden Cho, who plays Kira on the MTV series, tweeted that she was working on the set of Castle this week.

"Great time shooting CASTLE this week! Happy to be wrapped early! It's a beautiful day out," she tweeted.

Castle-Beckett Happening in Season 6?

In response, star Nathan Fillion (who plays Castle), tweeted, "You are a joy to work with. Much thanks."

There is no word on what type of character Cho will play, nor is there any indication of which episode she will be featured in.

In other Castle news, two new sneak peeks for the next episode of season 6 were released online Friday. The sneak peeks are from the episode Smells Like Teen Spirit, which is set to air Monday, Feb. 17.

The first clip features Castle and Beckett (Stana Katic) arguing about what their special song is; Beckett thinks its a Frank Sinatra classic while Castle thinks its a Bruce Springsteen hit.

The other clip features the partners back at Castle's old high school investigating their case of the week. Castle mentions that he is having "detention flashbacks" while sitting outside the high school principal's office.

Castle assumes that the principal has since retired, but he is startled to see that he is still in principal after all these years.

Watch the two clips here and here.

Castle season 6 airs Mondays at 10 p.m. on ABC.

Watch a promo for the next episode of Castle here:

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Castle, Television, ABC