Nathan Christopher Fillion (; born March 27, 1971) is a Canadian-American actor. He was born in Edmonton, Alberta. Fillion is best known for the lead role of Captain Malcolm Reynolds in the television series "Firefly" and its movie continuation, "Serenity", as well as his role as Richard Castle on the ABC series "Castle". Fillion will play Guy Gardner / Green Lantern in the 2025 movie "Superman".