Exactly how he gets involved with Morgan Le Fey and all of the mystic arts stuff isn’t clear from the trailer.
Of course, it’s difficult to see the forward thinking aspects of Doctor Strange behind the heavy layer of 1970s that sits over the whole thing.
In this version, Stephen Strange is a psychiatrist rather than a surgeon, who apparently has a relationship with his own patient, which seems about nine kinds on unethical.
He ends up at the home of the movie’s version of the Ancient One in order to get help for his patient, only to discover he’s been chosen as the next sorcerer supreme.