Margaret Anne Kirkpatrick (née Downs; born 29 January 1941) is an Australian stage and screen actress who starred in the cult TV series Prisoner (otherwise known as Prisoner: Cell Block H in the UK and North America), where she was best known both locally and internationally for her portrayal of the character Joan Ferguson, a sinister and cold lesbian prison officer, nicknamed "The Freak". She performed as in an Australian production of the musical Wicked as Madame Morrible In 2019, she released her autobiography The Gloves Are Off: The Inside Story From Prisoner to Wicked