Nathan Fillion

Nathan Fillion (born March 27, 1971) is a Canadian actor who is best known for his roles as Malcolm Reynolds on the Fox space western drama series Firefly in 2002 and its 2005 continuation film Serenity and currently stars as Richard Castle on the ABC crime drama series Castle since 2009.

He also voices Johnny J. Worthington, III in the 2013 Disney/Pixar film Monsters University.