'Castle' Season 6 spoilers: 'Chuck' star Joshua Gomez cast
Oddly, he's claiming to be a time traveler in that episode.
According to EW.com, Gomez will play a murder suspect who claims to have traveled into the past in order to stop some terrible event from occurring. The police, however, think that he is just a murderer.
Is the man crazy? Or did -- as Castle ( Nathan Fillion) will undoubtedly think -- actually travel through time?
This isn't the first time that an actor from "Chuck" has shown up on "Castle." Adam Baldwin, who played John Casey on "Chuck," reunited with his "Firefly" co-star Fillion on a 2012 episode of the police procedural. Bonita Friedericy, General Beckman on the spy comedy, also guest-starred on "Castle," playing a nun.
"Castle" Season 6 will premiere Monday, Sept. 23 at 10pm on ABC.