Dormammu (dɔrˈmɑːmuː) is a character appearing in American comic books published by Marvel Comics. Created by Stan Lee and Steve Ditko, the character first appeared in Strange Tales #126 (November 1964). He is the brother of supervilainess Umar and the uncle of superheroine Clea who rules over the Dark Dimension. Dormammu is a recurring antagonist of the superhero Doctor Strange. The character has also appeared in associated Marvel merchandise including films, animated television series, toys, trading cards, and video games. Dormammu made his live-action debut in the 2016 Marvel Cinematic Universe film Doctor Strange, performed through motion capture by Benedict Cumberbatch and voiced by a mixture of Cumberbatch and an unidentified British actor. Dormammu first appeared in Strange Tales #126–127 (Nov.–Dec. 1964), but had been mentioned previously in dialog, along with his realm the "Dark Dimension". Writer Mike Conroy said: To Lee and Steve Ditko, the Lord of the Realm of Darkness and the associated invocations were just another piece of business, another way of adding depth to the nature of Strange's adventures. However, the readers were intrigued. They wanted to know more. "It seems there was something about that nutty name, Dormammu, that was keeping Doc's devoted disciples awake at nights trying to figure out who Dormammu was," Lee explained. "I knew I was in big trouble. I had made up the name—now I had to dream up a character to go with the name. But who? How? Ditko visualized the answer. "He gave the demoniac DD...a visage totally different from any villain I had ever seen in comics before," proclaimed Lee. After being established as the ruler of an alternate dimension (later described as the god-tyrant of its denizens), Dormammu became a perennial foe of Sorcerer Supreme Doctor Strange, who until this time had dealt almost exclusively with off-beat "one-off" mystical threats in Strange Tales #110–125 (July 1963–Oct. 1964).