Agatha Harkness is a witch from Salem, Massachusetts, who was accused of practicing dark magic by her own coven during the Salem witch trials. Over three hundred years later, she sensed the presence of chaos magic radiating from the Westview Anomaly created by Wanda Maximoff. Unfazed by her thrall over the population of Westview, Harkness became obsessed with harnessing Maximoff's magic. Living under the pretense of the WandaVision sitcom, she stole Ralph Bohner's house and undertook the guise of Agnes, Maximoff's "nosy neighbor," all the while interfering with Maximoff's idyllic paradise to her own benefit. After discovering that Maximoff was Scarlet Witch, Harkness was defeated and stripped of her magical abilities, indefinitely condemned to live out her life as Agnes in Westview.