Firefly's Nathan Fillion and Summer Glau Will Reunite on Castle

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Firefly actors Nathan Fillion and Sumer Glau will reunite when Glau guest stars on Fillion's Castle for an episode in Season 8.

TV Line reports that Glau will play a "smart, sexy and strong private detective" who go up against Fillion's Richard Castle on a case. Glau will appear in the 14th episode of Castle Season 8.

Glau will be the third member of the Serenity's crew to visit Castle recently, with Adam Baldwin and Gina Torres appearing earlier this season. Glau also reunited with Fillion and fellow Firefly alum Alan Tudyk as part of the web series Con Man.

Castle's new season will return on Feb 1.