Also Read: 'Doctor Strange in the Multiverse of Madness': 'Baby-Sitters Club' Star Xochitl Gomez Joins CastUp-and-coming screenwriter Jade Bartlett wrote the latest draft of “Doctor Strange in the Multiverse of Madness” for Marvel Studios.Scott Derrickson will remain an executive producer after he stepped down from directing the sequel earlier this year due to creative differences.