The Final Frontier

One of the fans of a cult science fiction television show is murdered at a fan convention, leaving Beckett and Castle caught between avid fans and celebrity egos. Suspicion turns on the cast of the original show when they learn that the victim was resisting plans to revive the series for modern audiences. This episode contains multiple references to Nathan Fillion's leading role in Firefly (referred to as "that Joss Whedon show"), a short-lived science fiction television show that actually has reached cult status.