In the show, Hahn would reprise her role as the meddling witch Agatha Harkness, with WandaVision head writer Jac Schaeffer serving as both writer and executive producer on the project. via Technology and News Today https://www.theverge.com/2021/10/7/22714600/kathryn-hahn-wandavision-villain-agatha-harkness-disney-plus-show-spinoff