Nathan Fillion (born March 27, 1971) is a Canadian actor, currently starring as Richard Castle on the ABC series Castle. He is also known for his portrayal of the lead role of Captain Malcolm Reynolds in the television series Firefly and its film continuation Serenity.
Fillion has been involved in TV soap operas like One Life to Live, traditionally distributed films like Slither and Trucker, Internet-distributed films like Dr. Horrible's Sing-Along Blog, voice-over work like the video games Halo 3: ODST and Halo: Reach, and the theatre. He has also been recognized for his looks in People and Entertainment Weekly.
Fillion's public service work includes the co-founding of Kids Need to Read, an organization dedicated to getting more books into underfunded libraries.
Nathan Fillion as Richard Edgar "Rick" Castle ? Castle is a best-selling mystery writer. Born Richard Alexander Rodgers, he adopted the middle name Edgar in honor of Edgar Allan Poe. Castle was plagued with writer's block after killing off his popular lead character, Derrick Storm, whom he no longer found inspiring. He then found himself involved in the case of a copy-cat killer recreating murder scenes from his novels, investigated by NYPD Detective Kate Beckett. Castle discovers a new source of inspiration in her and soon begins shadowing her investigations, affording him the opportunity to use his knowledge and skills to help solve murders.