Castle 5x16 “Hunt“ - In the powerful conclusion of a two-episode story arc, when the FBI fails to get his daughter back, Castle takes matters into his own hands, reaching out to a shadowy fixer to help him recover Alexis. But Castle soon learns that his daughter’s kidnapping may be part of an even more sinister agenda, on ’Castle,’ Monday, February 25th. Emmy and Golden Globe-winner James Brolin (The West Wing, Marcus Welby, M.D.) guest stars in the episode as Castle’s dad. Subscribe to televisionpromos on