Nathan Fillion (born March 27, 1971) is a Canadian and American actor. He played the leading roles of Captain Malcolm "Mal" Reynolds on Firefly and its film continuation Serenity, and Richard Castle on Castle. As of 2018, he stars as Officer John Nolan on The Rookie and is an executive producer on the show, as well as its spin-off series, The Rookie: Feds during its run, as well as being a producer on an upcoming spin-off, The Rookie: North. Fillion has acted in traditionally distributed films such as Slither and Trucker, Internet-distributed films including Dr. Horrible's Sing-Along Blog and James Gunn's PG Porn, television soap operas, sitcoms, and theatre. His voice is featured in animation and video games, such as the Bungie games Halo 3, Halo 3: ODST, Halo: Reach, Destiny, and Destiny 2, along with the 343 Industries game Halo 5: Guardians, the television series M.O.D.O.K. (2021), and in the DC Universe Animated Original Movies as Hal Jordan / Green Lantern. Fillion first gained recognition for his work on One Life to Live in the contract role of Joey Buchanan, for which he was nominated for the Daytime Emmy Award for Outstanding Younger Actor in a Drama Series, as well as for his supporting role as Johnny Donnelly in the sitcom Two Guys and a Girl. Fillion received an honorary doctor of laws degree on May 30, 2025, from Concordia University of Edmonton. (Via Wikipedia)