Nathan Fillion (/ˈfɪliən/; born March 27, 1971)[1][2] is a Canadian-American actor, best known for the leading roles of Captain Malcolm "Mal" Reynolds on Firefly and its film continuation Serenity, Richard Castle on Castle, and is currently starring as John Nolan on The Rookie.

Fillon provides the voice for Dok'maqux.

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