The 12th Precinct is being invaded by the Russians on the next episode of Castle, when Castle (Nathan Fillion) and crew get paired with a Russian security officer (guest star Nick E. Tarabay) after the son of a diplomat is murdered.

Mega Buzz: Will Castle really continue without Castle and Beckett?

In this exclusive clip, Castle and Beckett (Stana Katic) have to inform their biggest Russian fan that they no longer work together. The look on the poor guy's face when he finds out that his favorite crime-fighting duo is no longer a working partnership is priceless. "Beckett without Castle is like Boris without Natasha," he laments.

We feel you, bro. Perhaps having someone so enthusiastic about Castle and Beckett being together will remind the duo what they're missing?

Castle airs Monday at 10/9c on ABC.