The British actress would join Benedict Cumberbatch in the film produced by Marvel Studios.

Swinton would play the Ancient One, a Tibetan mystic who acts as a mentor to Doctor Strange in the film that's being directed by Scott Derrickson, according to The Hollywood Reporter.

Doctor Strange tells the story of a surgeon who loses the use of his hands and discovers supernatural powers as he attempts to heal himself.

Swinton's character is in charge of training the next sorcerer supreme in the story.