The Doctor Strange sequel that Scott Derrickson was working on before he had to leave the project.
Now, while talking to fans on Twitter, Derrickson may have unconsciously dropped a valuable hint about the terrifying inspiration behind the Doctor Strange sequel.
This would bear out with what Derrickson had said in the past when he was still attached to the project, about Doctor Strange being Marvel’s first horror movie.
Could it be Derrickson had Doctor Strange in mind when he mentioned The Mountains of Madness in his tweet?