John Mitchell is a fictional vampire in the comedy-drama TV series Being Human, portrayed by Guy Flanagan in the pilot and afterwards by Aidan Turner.

The male lead for the duration of the show's first three series appeared in 23 episodes of the drama, as well as in three Being Human novels.

[2] In the Pilot's narrative Mitchell is a vampire who works with his werewolf friend George in a hospital, where they both have a menial job.

As soon as Mitchell and George move into the room they figure out that a ghost of a young woman named Annie is already living in the house.

[4] While his friend George doesn't like Annie, Mitchell instantly feels a connection towards her and wants her to stay in the house.

When Mitchell tries to find Herrick he stumbles upon a cellar in which humans are held in a horrible condition as food sources for the vampires.

[10] Unknowing to Mitchell Lucy Jaggat works along with priest Kemp in an organization, called CenSSA which tries to heal werewolves by destroying the evil gene.

They set up an explosion in the bar where Mitchell's Blood Addicts society takes place.

[15] Mitchell and his vampire friend Daisy kill twenty people in a train massacre.

Too late they figure out that Kemp can't keep what he has promised and that a lot of werewolves are killed during his experiments.

However, their luck is overshadowed by Mitchell's guilt of his deeds as a vampire, most importantly his recent kills at the train massacre.

This way also the dynamic of the main characters would change, which made the production crew rethink their previous casting choices.

Creator Toby Whithouse later said that the pilot vampires were a “bit too Anne Rice” for his liking.

Russell Tovey said in an interview that the George that he played alongside Guy Flanagan (Mitchell - Pilot) and Andrea Riseborough (Annie - Pilot) was different from the George that he played alongside Lenora Crichlow and Aidan Turner, because each actor would respond differently to the character.

So creator Toby Whithouse knew before that at some point Aidan Turner would leave the series.

To prepare for this Whithouse wrote a sequence in series two where Aidan's character Mitchell would kill many innocent people in a train.

[19] In 2016 at the MCM London Comic Con Turner said that he is up for another one-off special of Being Human with his former co-stars Russell Tovey and Lenora Crichlow.

[20] Originally the BBC asked Whithouse to write a story about three college graduates buying a house together.

[30] Even though Guy Flanagan got replaced by Aidan Turner after the Pilot, both actors were praised for their portrayal.

Vanessa Randolph from Fruitless Pursuits enjoyed Guy Flanagan's performance as Mitchell.

According to her Guy “brought an otherworldly quality to Mitchell” that she “couldn’t see being replicated, an ‘oldness’ and romance associated with vampires.” When she heard that Flanagan would leave the show, she was devastated.

He describes Guy Flanagan’s Mitchell as a “laconic, icy vampire who is eaten up with blood-curdling guilt” when he kills humans, drinking their blood.

She loved Flanagan's “more sardonic, constantly-bemused performance and his chemistry with the co-stars” and was sad that he was replaced with Aidan Turner.

[34] Daniel Martin from The Guardian thinks that Guy Flanagan's Mitchell was too stylised and too vampiric.

[37] Mark Oakley from Den of Geek said that by playing Mitchell Aidan Turner shows what an awesome actor he is “adding dramatic weight, a credible romantic interest and a smattering of leading man about him when necessary.

"[38] Brent Hartinger from Logo TV feels that Aidan Turner as Mitchell is "very easy on the eyes".

[39] According to Robert Moore from PopMatters Mitchell is the most compelling character of the show and should be ranked within the "shortest of short lists of great TV vampires".

Robert Moore thinks Mitchell is a fascinating character in the same league as Joss Whedon's Spike or Angel.

[40] In 2011 and 2012 Aidan Turner was nominated as best actor and sexiest male for playing John Mitchell by the SFX magazine.