The original writer of Doctor Strange has shared some exciting details about what he and director Scott Derrickson originally had planned for a sequel, as well ideas that were dropped during development on the first movie. C. Robert Cargill has been a frequent Derrickson collaborator, having written the screenplays for Sinister, Doctor Strange, The Black Phone, The Gorge, and the upcoming Black Phone 2. When Derrickson departed Marvel Studios, it appears he took with him an interesting pitch for what the Strange sequel might have been.
Original Villain for 'Doctor Strange in the Multiverse of Madness' Revealed

14