Agatha Harkness is the main antagonist of the WandaVision.
Agatha went under the alias "Agnes", and acted as Scarlet Witch's neighbor. She was always in the background of the series popping up and checking in on Wanda. When Wanda makes her way to Agatha's basement, she discovers a lair filled with artifacts, books and glowing vines. Agatha comes out of the shadow and reveals herself as a fellow witch to Wanda.
She is portrayed by Kathryn Hahn
Avalon Multiversal Tour[]