Adam Sutler is the version of Adam James Susan in the film (a portmanteau of "Susan" and "Hitler"), and is portrayed by John Hurt. His title is "High Chancellor".
Sutler was "a young and upcoming politician" and "a deeply religious man and a member of the Conservative party". After the founding of Norsefire, he is mentioned briefly as Under-Secretary for Defence during the "Saint Mary's crisis", thus implying a coalition government between Norsefire and a stronger party. Sutler is elected Prime Minister by promising to restore order to the country after terrorists supposedly killed 80,000 people with a self-ignited bioweapon that created a viral epidemic (it is later revealed that Norsefire had actually launched the attack). He then uses the supposed terrorist threat as a pretext for genocide, along with an ongoing propaganda campaign in the state-run media, to cow the public into silence and appoint himself High Chancellor, turning the country into a single-party state with himself as an autocrat.
For most of the film he is only seen on television, until the end when he finally appears in person moments before his death.
When Sutler discovers he is being lampooned in a farce on a talk show, he is enraged and orders the show's host, Gordon Dietrich, arrested in the dead of night and executed (the official story is that Dietrich was killed only after a Qur'an was discovered among his belongings).
Sutler blames Peter Creedy for the failure to stop V and threatens to fire him. In order to secure his own power, Creedy subsequently promises to V to assassinate Sutler. Creedy and his men kidnap Sutler from his bunker and bring him to V in the London Underground, where Creedy personally executes Sutler, shooting his hated boss in the head at point-blank range.
Sutler, portrayed by John Hurt, is also given visual similarities with Oswald Mosley and Adolf Hitler, having a similar hairstyle, figure, moustache and style of military dress Mosley wore (the "blackshirt"). However, Sutler is described as having broken away from the Conservative Party, while in real life, Oswald Mosley's New Party, which developed into the British Union of Fascists, was a breakaway from Labour. Adam Susan in comparison, however, is extremely different and shares more similarities with Benito Mussolini.