Nathan Fillion is a Canadian actor best known for his lead role as Captain Malcolm 'Mal' Reynolds in the television sci-fi series Firefly and its spin-off movie Serenity (2005).
After working in several theatre, television and film productions, including Theatresports with Rapid Fire Theatre and the improvised soap opera Die-Nasty, Fillion moved to New York City in 1994 where he acted in the soap opera One Life to Live as Joey Buchanan, for which he was nominated in 1996 for a Daytime Emmy Award in the "Outstanding Younger Actor" category.
In 1997, he left the series to pursue other projects.
After moving to Los Angeles, he played a supporting role in the sitcom Two Guys, a Girl, and a Pizza Place. He was also cast as "the Minnesota Ryan" in Steven Spielberg's Saving Private Ryan.
In 2002, Fillion starred as Captain Malcolm Reynolds in the Joss Whedon science fiction television series Firefly, for which he won the "Cinescape Genre Face of the Future - Male" award by the Academy of Science Fiction, Fantasy & Horror Films, USA.
Fillion also won the SyFy Genre Awards in 2006 for Best Actor/Television and was runner-up for Best Actor/Movie.
Fillion reprised his role as Reynolds in Whedon's movie Serenity (2005).
He also had a recurring role as Caleb in the final season of Whedon's series Buffy the Vampire Slayer.
He has lent his voice to the animated series King of the Hill in 2001, the video game Jade Empire (as the voice of Gao the Lesser), and the animated series Justice League Unlimited (as Vigilante in the episodes "Hunter's Moon" and "Patriot Act") in 2005 and 2006.
Fillion starred in James Gunn's 2006 horror film Slither. For his starring role as Bill Pardy, he garnered a 2006 Fangoria Chainsaw Awards nomination in the category of Dude You Don't Wanna Mess With.
However, Slither was a box office bomb, earning a disappointing $3,880,270 in its opening weekend, and grossing a worldwide box office total of $12.2 million, substantially less than its total budget of $29.5 million (when marketing costs are included).
Fillion starred in the romantic comedy film Waitress, written and directed by Adrienne Shelly, which premiered at the Sundance Film Festival January 21, 2007. He also starred in White Noise 2: The Light.
He had a recurring role in the third season of the television show Lost, as Kevin, Kate's ex-husband.
In October of 2006 Fillion signed a talent holding contract with the Fox Broadcasting Company. He was cast in the lead role of Alex Tully in the series Drive, which debuted on FOX in Spring 2007.
Drive was created by Fillion's longtime friend and former Angel and Firefly writer Tim Minear. Ivan Sergei played Alex Tully in the original pilot episode of Drive.
From 2009-2016 he played the eponymous lead role in the television drama series Castle, playing a mystery writer who begins helping the NYPD after a copycat killer starts acting out the crimes in his books.