Simone Lenoir is the main antagonist of the Scooby-Doo franchise's 6th feature film Scooby-Doo on Zombie Island and the overarching antagonist of the 2019 sequel Scooby Doo! Return to Zombie Island.
She is a deadly werecat (disguised as a human) along with her maid Lena Dupree who lives on Moonscar Island and drains the life force of visitors every harvest moon in order to preserve her immortality.