Nathan Fillion
Nathan Fillion (/ˈfɪljən/; born March 27, 1971) is a Canadian actor best known for his role as Richard Castle on the ABC series Castle as well as his earlier portrayal of the lead role of Captain Malcolm Reynolds in the television series Firefly and its feature film continuation, Serenity. He has acted in traditionally distributed films like Slither and Trucker, Internet-distributed films like Dr. Horrible's Sing-Along Blog, television soap operas and sitcoms, and theater. Fillion has also voiced several video games, including the Bungie titles Halo 3, Halo 3: ODST, Halo: Reach and Destiny.