A hideous, terrifying, green she-cat with surprisingly pretty amber eyes that can turn anyone to stone. She has "hair" on her head composed of snakes.
Medusa and her sisters, Stheno and Euryale, are cat-monsters that roam around Twoleg Place turning cats to stone. They escaped from The Place of Eternal Darkness and are pure evil. Medusa is the only one out of the three who is mortal, but the only way to kill her is to decapitate her while avoiding her gaze.