castle deep cover abc main james brolin 'Castle' photos: James Brolin returns as Jackson Hunt in 'Deep Cover'

When “Castle” said goodbye to its title character’s long-lost spy of a father Jackson Hunt in Season 5, it could have been forever. But James Brolin will soon return to play Hunt in the upcoming episode, “Deep Cover.” Will the CIA operative get in trouble for murder this time?

Castle and Beckett cross paths with Hunt after a young video-store clerk is murdered. It turns out that the man is also a high-level hacker — one who may have had ties to the world of espionage.

Do the detectives have any clue of who they’re about to meet when they go to this office?

castle deep cover abc 1 stana katic nathan fillion 'Castle' photos: James Brolin returns as Jackson Hunt in 'Deep Cover'Based on this greeting, it’s likely that Beckett at least doesn’t know.

castle deep cover abc 2 james brolin nathan fillion stana katic 'Castle' photos: James Brolin returns as Jackson Hunt in 'Deep Cover'Castle is having way too much fun with this.

castle deep cover abc 3 stana katic nathan fillion james brolin 'Castle' photos: James Brolin returns as Jackson Hunt in 'Deep Cover'Is Hunt going to give them any information?

castle deep cover abc 4 james brolin 'Castle' photos: James Brolin returns as Jackson Hunt in 'Deep Cover'Although Castle may be enjoying this encounter …

castle deep cover abc 5 nathan fillion 'Castle' photos: James Brolin returns as Jackson Hunt in 'Deep Cover'Will Beckett feel the same when she finds out who this person of interest is?

castle deep cover abc 6 stana katic 'Castle' photos: James Brolin returns as Jackson Hunt in 'Deep Cover'“Deep Cover” airs Monday, Jan. 13 on ABC.