Agatha Harkness

Agatha Harkness is a fictional character and anti-heroine appearing in American comic books published by Marvel Comics. The character first appeared in Fantastic Four #94 and was created by Stan Lee and Jack Kirby.

She is a witch who is the mentor of the Scarlet Witch and an ally of the Fantastic Four when she babysat Mr. Fantastic and Invinsible Woman's baby, Franklin Richards. She also has a companion, Ebony, who is her cat familiar.

The character is played by American actress Kathryn Hahn in the Marvel Cinematic Universe (MCU) miniseries WandaVision (2021), and is set to reprise her role in a spin-off series about the character, Agatha: Coven of Chaos.