About
Nathan Fillion is a Canadian and American actor known for his leading roles in popular television series. He gained a dedicated following as Captain Malcolm "Mal" Reynolds in the sci-fi series *Firefly* and its film continuation *Serenity*. Fillion also starred as Richard Castle in the crime drama *Castle*. He currently stars as Officer John Nolan on *The Rookie*, where he also serves as an executive producer.
Career Timeline
Firefly's Captain Reynolds
Stars as Captain Malcolm Reynolds in *Firefly*.
Castle's Lead Role
Cast as Richard Castle in the TV series *Castle*.
Castle success continues
*Castle* becomes a major success, solidifying his career.
The Rookie's Lead Actor
Stars as Officer John Nolan in *The Rookie*.
Executive Producer and Star
Continues to star in *The Rookie*, also serving as an executive producer.
Related Celebrities
Last updated: February 24, 2026