While Marvel Studios may have only recently announced the start of Doctor Strange's production, set photos taken in Nepal confirmed that the Phase 3 movie has actually been shooting for weeks. Now, as more details come out, Sinsiter writer C. Robert Cargill has taken to Twitter to confirm that he's spent the past year working on the screenplay for director Scott Derrickson. Expanding on the Tweet below, he also took to Facebook to say: "It’s not a secret anymore. For those of you who don’t know what I’ve been doing for the past year, I’ve been writing DOCTOR STRANGE for Marvel Studios. And I couldn’t be happier or prouder. Our cast and crew are amazing and I’m having the best time." These guys have a fair bit of history together, as does the Doctor Strange script. After intially being penned by Thomas Donnelly and Joshua Oppenheimer (Conan the Barbarian), Jon Spaihts (Prometheus) took a crack at it before Cargill performed the final rewrite.