So while we won’t see Jessica Chastain as a female version of Mastermind casting illusions, some of the tactics she employs in Dark Phoenix will be reminiscent of what Mastermind used in the comics.
During this time in the organization in The Dark Phoenix Saga, he used his illusions and a mind-tap device created by Emma Frost to convince Jean Grey that she was living a life as a Victorian aristocrat who was married to Mastermind and serving on the Hellfire Club as the Black Queen, thus turning her against the other X-Men.
For those unfamiliar with Mastermind, real name Jason Wyngarde, he started out in the comics as a member of Magneto’s Brotherhood of Evil Mutants, but later on he became a member of the Hellfire Club.
Unfortunately for Mastermind and the rest of the Club, Jean, who by now had turned into Phoenix, eventually broke free from Mastermind’s control and made him experience godhood for a brief moment in his mind, which left him catatonic.