We don't exactly know when it's going to happen, but Doctor Strange 2 certainly feels inevitable. To date, The Incredible Hulk is the only Marvel Studios film not to get a sequel, and the Doctor Strange was the company's most successful solo character launch since 2008's Iron Man. The good news on this front is that director Scott Derrickson already has some good ideas stored up in his mind for a follow-up, imagined but not executed during the making of the first movie. The only problem may be that Marvel doesn't really work that way when it comes to developing approach.