Pre-production on Doctor Strange in the Multiverse of Madness has been both strange and filled with madness so far, so A+ for accuracy. The hullabaloo began when Scott Derrickson exited the director's chair over "creative differences" with Marvel, which was a bummer because Derrickson is a seriously talented filmmaker, brought Stephen Strange (Benedict Cumberbatch) into the MCU back in 2016, and was hinting at a more horror-focused sequel. But then Sam Raimi was announced as Derrickson's likely replacement, which was decidedly not a bummer because he's Sam goddamned Raimi. The assumption at the time was …