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Acting
Nathan Fillion (born March 27, 1971) is a Canadian-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 John Nolan on The Rookie and is an executive producer on the show as well as its spin-off series, The Rookie: Feds. Fillion has acted in traditionally distributed films like Slither and Trucker, Internet-distributed films like Dr. Horrible's Sing-Along Blog, television soap operas, sitcoms, and theatre. His voice is featured in animation and video games, such as the Bungiegames Halo 3, Halo 3: ODST, Halo: Reach, Destiny, and Destiny 2, along with the 343 Industries game Halo 5: Guardians and the television series M.O.D.O.K. (2021). 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. Description above from the Wikipedia article Nathan Fillion, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Man of Tomorrow
as Guy Gardner

The Mighty Nein
as The Gentleman (voice)

Superman
as Guy Gardner

DC Studios Showcase: The Official Podcast
as Self

Skincare
as Brett Wright

Deadpool & Wolverine
as Headpool (voice)

Grave Conversations
as Self

Krapopolis
as Zan (voice)

Bupkis
as Ace Spade

Guardians of the Galaxy Vol. 3
as Master Karja

The Recruit
as CIA Director Alton West

The Rookie: Feds
as John Nolan

The Jennifer Hudson Show
as Self

Everything I Ever Wanted to Tell My Daughter About Men
as Duke

Peacemaker
as Guy Gardner

Adrienne
as Self

Family Law
as Bud Nielsen

The Suicide Squad
as T.D.K.

Monsters at Work
as Johnny (voice)

Marvel's M.O.D.O.K.
as Simon Williams / Wonder Man (voice)

Resident Alien
as Octopus (voice)

The Disney Family Singalong - Volume II
as Self

The Death and Return of Superman
as Hal Jordan / Green Lantern (voice)

The Kelly Clarkson Show
as Self

Night Hunter
as Quinn

The Death of Superman
as Hal Jordan / Green Lantern (voice)

Reign of the Supermen
as Green Lantern / Hal Jordan (voice)

Henchmen
as Captain Superior (voice)

The Rookie
as John Nolan

Big Mouth
as Nathan Fillion (voice)

Here's How It Was: The Making of 'Firefly'
as Self

Yamasong: March of the Hollows
as Shojun (voice)

Cars 3
as Sterling (voice)

Santa Clarita Diet
as Gary West

A Series of Unfortunate Events
as Jacques Snicket

American Housewife
as Nathan Fillion

Geeking Out
as Self

HarmonQuest
as Tetter Spice

Gravity Falls: Between the Pines
as Preston (Voice)

Nightmare Time
as Himself

CelebriD&D
as Jolene Glaplok

Robot Chicken DC Comics Special III: Magical Friendship
as Green Lantern (voice)

Con Man
as Jack Moore

Being Canadian
as Self

The Thrilling Adventure Hour Live
as Cactoid Jim

Justice League: Throne of Atlantis
as Green Lantern / Hal Jordan (voice)

Assassin Banana
as Chick del Monte / Assassin Banana (voice)

Guardians of the Galaxy
as Monstrous Inmate

The Real History of Science Fiction
as Self

Robot Chicken DC Comics Special II: Villains in Paradise
as Green Lantern / Black Adam (voice)

Highway of Tears
as Narrator

Party Central
as Johnny (voice)

Rick and Morty
as Cornvelious Daniel (voice)

Brooklyn Nine-Nine
as Mark Devereaux

Percy Jackson: Sea of Monsters
as Hermes

Justice League: The Flashpoint Paradox
as Green Lantern / Hal Jordan (voice)

Drunk History
as Wernher von Braun

Monsters University
as Johnny (voice)

Much Ado About Nothing
as Dogberry

Neil's Puppet Dreams
as Dr. Mayfair