Peggy Gravel (Mink Stole) is a frazzled housewife who has just been released from a mental hospital. Arriving at her suburban Baltimore home in a delicate state, she quickly decides that her husband is trying to kill her...and coerces her rotund maid, Grizelda (Jean Hill), to suffocate him with her ample bottom. In order to escape imprisonment, the unlikely duo seeks refuge in Mortville, a oddball shantytown populated by criminals and social outcasts. To the citizens dismay, however, vicious Queen Carlotta (Edith Massey) rules the kingdom with an iron fist. With assistance from a cranky pre-op transsexual (Susan Lowe) and her sexpot lover (Liz Renay), Peggy and Grizelda attempt to navigate their strange new lives.