Castle frequently makes references to star Nathan Fillion's previous TV series, and has often featured people who were in it. These are actors, episodes or elements with clear links to Joss Whedon's short-lived 2002 "space cowboy" series "Firefly".
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Ethan Slaughter -
The Final Frontier -
Headhunters -
Boom! -
Home Is Where the Heart Stops -
Close Encounters of the Murderous Kind -
Nathan Fillion -
Adam Baldwin
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