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Mark Gatiss (/ˈɡeɪtɪs/; born 17 October 1966) is an English actor, comedian, screenwriter, director, producer and novelist. He is best known for his work on television, acting in and co-creating shows with Steven Moffat. Gatiss has received several awards, including a BAFTA TV Award, a Primetime Emmy Award, a Peabody Award, and two Laurence Olivier Awards. Gatiss co-created, co-wrote and acted in the BBC comedy series The League of Gentlemen (1999–2002). He co-created and portrayed Mycroft Holmes in the BBC series Sherlock (2010–2017) and Frank Renfield in the BBC / Netflix miniseries Dracula (2020). He also wrote several episodes of Doctor Who during Moffat's tenure as showrunner and two episodes during Russell T Davies' earlier tenure. His other TV roles include Tycho Nestoris in Game of Thrones (2014–2017), Stephen Gardiner in Wolf Hall (2015), and Peter Mandelson in Coalition (2015). He has acted in films such as Victor Frankenstein (2015), Denial (2016), Christopher Robin (2018), The Favourite (2018), The Father (2020), Operation Mincemeat (2021), and Mission: Impossible – Dead Reckoning Part One (2023). On stage, Gatiss played Menenius in the revival of William Shakespeare's Coriolanus (2013), for which he earned a Laurence Olivier Award for Best Actor in a Supporting Role nomination. He took on the role of King George III in a revival of the Alan Bennett play The Madness of George III (2018). He portrayed Sir John Gielgud in the Jack Thorne play The Motive and the Cue (2023), for which he earned the Laurence Olivier Award for Best Actor. His other theatre roles include The Recruiting Officer (2012), The Vote (2015), and A Christmas Carol: A Ghost Story (2021). Description above from the Wikipedia article Mark Gatiss, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Being Stanley Baxter
as Self

The Fantastic 4: First Steps
as Ted Gilbert

Bookish
as Gabriel Book

Marvel Studios' The Fantastic Four: First Steps - World Premiere
as Ted Gilbert (archive footage) (uncredited)

Mission: Impossible - The Final Reckoning
as Angstrom

Inside No. 9: The Party's Over
as Self

Moonflower Murders
as Frank Parris / Oscar Berlin

Time Bandits
as Earl of Sandwich

National Theatre Live: The Motive and the Cue
as Sir John Gielgud

3 Body Problem
as Isaac Newton

The Hound of the Baskervilles
as Sherlock Holmes

Hammer A.D. 2023
as Self

Juice
as George

Mission: Impossible - Dead Reckoning Part One
as NSA

Nolly
as Larry Grayson

A Christmas Carol: A Ghost Story
as Jacob Marley

Peter Davison: Uncut!
as Self

Inside Classical
as Sherlock Holmes

The Road Dance
as Doctor MacLean

Operation Mincemeat
as Ivor Montazac

The Amazing Mr. Blunden
as Mr. Wickens
Memento Mori
as Henry Huxley

The Sparks Brothers
as Self

A Silent Imprisonment
as Mr Murphy

Locked Down
as Donald

The Father
as The Man

Cold War Steve Meets the Outside World
as Self

Tales of the Uncanny
as Self

Scandal & Beauty: Mark Gatiss on Aubrey Beardsley
as Self

In Search of Dracula
as Himself - Presenter

Dracula
as Frank Renfield

Doctor Who and the Third Man
as Himself

Good Omens
as Mr. Harmony

Brexit: The Uncivil War
as Peter Mandelson (voice)

The Dead Room
as Radio Announcer (voice)

The Favourite
as Lord Marlborough

National Theatre Live: The Madness of George III
as George III

Sally4Ever
as Doctor

Mark Gatiss on John Minton: The Lost Man of British Art
as Himself - Presenter

Christopher Robin
as Giles Winslow

The Mercy
as Ronald Hall

Doctor Who: Twice Upon a Time
as The Captain

Gunpowder
as Sir Robert Cecil

Mars: a Traveller's Guide
as Narrator

Against the Law
as Dr. Landers

Taboo
as Prince Regent

Denial
as Professor Robert Jan van Pelt

Absolutely Fabulous: The Movie
as Joel

Our Kind of Traitor
as Billy Matlock

Dad's Army
as Colonel Theakes

Mark Gatiss: A Study in Sherlock
as Himself

Sherlock: The Abominable Bride
as Mycroft Holmes

Victor Frankenstein
as Dettweiler

London Spy
as Rich

Premium Bond with Mark Gatiss and Matthew Sweet
as Himself

Doctor Who: The Fan Show

The Vote
as Steven Crosswell
Release the Hound!
as Self

Thunderbirds Are Go!
as Dr. Quentin Questa (voice)

Coalition
as Peter Mandelson