is an American web television series, based on the Marvel Comics supervillain of the same name. The series is a spin-off of and sequel to WandaVision. It is the twenty-fourth television series in the Marvel Cinematic Universe and the tenth installment of Phase Five. The series is produced by Marvel Television and was released on Disney+.
Agatha Harkness was a witch from Salem, Massachusetts, who was accused of practicing dark magic by her own coven during the Salem witch trials. She later gave birth to her son Nicholas Scratch, who was born sick and frail, and initially lived a quiet life with him, killing witches every once in a while to steal their powers, until he died from his illnesses. Having created the tale of the Witches' Road with Nicholas prior to his death, Harkness was approached by numerous witches who sought the Road and tricked them into joining her in a coven only to later provoke them into attacking her to steal their powers, repeating this for many centuries.
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 Wanda's magic. Living under the pretense of the WandaVision sitcom, she stole Ralph Bohner's house and undertook the guise of Agnes, Wanda's "nosy neighbor," all the while interfering with Wanda's idyllic paradise to her own benefit. Upon discovering that Wanda was the Scarlet Witch, Harkness was defeated and stripped of her magical abilities, indefinitely condemned to live out her life as Agnes O'Connor in Westview.
However, in 2026, two years after the death of the Scarlet Witch, the spell that had enthralled Harkness failed and was broken by a reincarnated Billy Maximoff who sought Harkness. Pursued by the Salem Seven, the vengeful children of the Salemites, Harkness assembled a coven with Billy, intending to trick them too, but was surprised when the door to the Road actually appeared. Harkness walked the Road with her coven in an attempt to regain her lost powers, coming into confrontation with the sins of her past and her former lover Rio Vidal. In reality, Vidal was the embodiment of Death and had joined the coven to claim Billy due to him upsetting the cosmic balance by reincarnating into a dead body. Realizing the error of her ways, she sacrificed herself to save Billy from Death but soon returned as a ghost and joined him in searching for his brother Tommy Maximoff.