Agatha Harkness is a character in the Marvel Cinematic Universe, and the main antagonist of the Marvel Disney+ series, WandaVision. She is a magical witch, living in Westview, and manipulating Wanda Maximoff, but goes under the guise of a housewife named Agnes, a nosy neighbor, who gleefully inserts herself into Wanda and Vision's lives. As each episode passes, she adapts into a new time period. She makes her debut in the first episode and is portrayed by starring cast member, Kathryn Hahn.