Mark Gatiss

Mark Gatiss (born 17th October 1966, in Sedgefield, Durham, England, UK) has been a major creative force in the production of Doctor Who fiction since the 1990s. Given his accomplishments as a Doctor Who author, screenwriter, audio writer, audio actor, screen actor, documentary narrator, and documentary subject, no other individual truly comes close to Gatiss in terms of the breadth of his contributions to the Doctor Who franchise.

Televised Doctor Who
Just in terms of televised Doctor Who, he has contributed three scripts to the BBC Wales version of Doctor Who, made two guest appearance, and been the sometimes-narrator, sometimes-subject of Doctor Who Confidential. Although other writers had previously enjoyed small roles in the 1963 version of Doctor Who, he was the first to have had a large speaking role — much less a part the size of Professor Richard Lazarus, who was the titular villain of The Lazarus Experiment. He also made a brief appearance in Victory of the Daleks as a spitfire pilot, which made him the only person to have written and starred in the same episode of Doctor Who. He claimed that the small role also made him "the first and only person so far to write for the series and be in it twice".

Doctor Who work in other media
Outside the programme proper, he has written various officially licensed novels, televised spoofs and audio plays, and has sometimes lent his voice to Big Finish Productions. Counting BBC-made spoofs and these audios, he is alone with Sir Derek Jacobi in having played both the Doctor and the Master.

Work with Doctor Who personnel outside of the programme
Gatiss also has significant relationships with Doctor Who luminaries that extend beyond the programme itself.

For instance, he is a sometimes-partner of Steven Moffat, with whom he created and produced Sherlock, a TV series that was in production at BBC Wales at the same time as Moffat's first series as head writer of Doctor Who. He also played Robert Louis Stevenson in Moffat's Jekyll.

He has had some form of professional or semi-professional contact with every actor to have played the Doctor except William Hartnell and Patrick Troughton. David Tennant is his most common acting partner amongst people who've played the Doctor. They've been on screen together on several occasions — most prominently in The Quatermass Experiment and the episode "Drop Dead" of Randall & Hopkirk (Deceased), which also featured Jessica Hynes. He's also been alongside Tennant in Bright Young Things, which also co-starred Fenella Woolgar, Stephen Fry, Bill Paterson, Richard E. Grant, and Jim Broadbent; and the English-language cast of the Norwegian animated adventure Free Jimmy, with Simon Pegg, Jim Broadbent and Steve Pemberton. He and Tom Baker have occasionally crossed paths, through their mutual connection to Matt Lucas. Gatiss script edited several episodes of Little Britain, on which Baker was the regular narrator, and fellow Doctor Who Confidential narrator, Anthony Head, played a leading role. Later, Baker and he both appeared as actors in Lucas' The Wind in the Willows. Christopher Eccleston once appeared on an episode of Gatiss' show, The League of Gentlemen. Peter Davison and he were in several BBV productions at the start of Gatiss' career, but they have not, as of 2010, acted together in a fully professional production, except on Big Finish Productions audio. By virtue of his participation in The Zero Imperative, he's acted on-screen alongisde Caroline John, Jon Pertwee, Sylvester McCoy, Colin Baker, Louise Jameson, and Sophie Aldred.