Fans of the “WandaVision” character Agatha Harkness can rejoice, because the witch is getting a series all to herself, and best of all, Aubrey Plaza has joined the cast. The talented “White Lotus” actress will pair up with Kathryn Hahn, who memorably played Harkness in “WandaVision” last
year, for the spin-off series
“Agatha: Coven of Chaos.”