Unable to play video. The Sorcerer Supreme is set to play a major role in Avengers: Infinity War, as evidenced by the trailers and the fact that he is the keeper of the Time Stone. But that hasn't stopped fans from wondering about a sequel to Doctor Strange. At a recent screening for the 2016 Marvel Studios movie, screenwriter C. Robert Cargill revealed his plans for the antagonist of a potential Doctor Strange 2, saying simply that "Nightmare will be the villain.