Doctor Strange has fought many magical foes over the years, and he has been aided at times by a small army of allies, and ...

He'll eventually become the Sorcerer Supreme himself, Doctor Strange, who will protect the Earth from outside magical forces. An image of Strange in his costumed suit was teased in the end shots ...

That would be The Ancient One ... her character is sharply drawn, powerful and thought-provoking; and her arc might be more satisfying than any other character's in Doctor Strange.