The origin of Marvel Studios Agatha All Along is just as captivating as its on-screen content, and the behind-the-scenes revelations add a whole new layer of appreciation for the Disney+ series. While the show serves as a spin-off to WandaVision, its path to creation is far more unique than a simple continuation of an existing characters arc. In Assembled: The Making of Agatha All Along, Marvels documentary about the production, Jac Schaeffer – WandaVisions creator and Agatha All Alongs showrunner – offered an intriguing explanation of how the series came to life.

https://screenrant.com/agatha-all-along-mcu-show-created-story/