Lady Divine is the owner and operator of a show titled The Cavalcade of Perversion, a free exhibit of various perversions and fetish acts and obscenities, such as the "Puke Eater". The show is free, but the various performers must persuade and even physically drag reluctant passers-by to attend.
As a finale to every show, Lady Divine appears and robs the patrons at gunpoint. This arrangement seems successful to Mr. David, Lady Divine's lover, but Lady Divine becomes bored with the routine and decides to murder the patrons rather than merely robbing them. After escaping the murder scene, she comes home to Cookie, her prostitute daughter, and her new boyfriend Steve, a member of the Weather Underground.
Lady Divine receives a call from Edith, proprietor of the local bar, who informs her that Mr. David had been at her bar with another woman (Mary Vivian Pearce). Lady Divine heads there to catch them, but is raped on the way by two glue-sniffers. Meanwhile, Mr. David and his new lover Bonnie—a woman who desperately wants to be part of the troupe—engage in sex acts at the home he shares with Lady Divine, during which Bonnie anally penetrates him with a dildo.
While Lady Divine contemplates her rape, the Infant of Prague appears and leads her to a church. Making her way uncertainly into the church, Lady Divine prays, but is then approached and seduced by a strange young woman named Mink. They have a sexual encounter in the church pew, the woman inserting a rosary into Lady Divine's rectum while describing the Stations of the Cross.
Now lesbian lovers, Lady Divine and Mink go to Edith's bar with the intent to kill Mr. David and his mistress, but they are too late: David and Bonnie, his lover (who have by this time decided that they have to kill Lady Divine to protect themselves) have left.
Mr. David returns to Cookie's house to kill Divine, but finds only Cookie and fellow performer Rick there. An argument ensues, and Bonnie accidentally kills Cookie. They tie up Rick and hide Cookie's corpse just before Divine and Mink return. When Bonnie tries to shoot Lady Divine, Divine attacks and kills her with a knife. She then turns on Mr. David and eviscerates him as well, devouring his internal organs and becoming more frenzied. Rick appears and surprises Mink, who shoots him. In a fit of anger, Divine accuses Mink of betrayal and stabs her. Divine becomes even more crazed upon finding her daughter's body hidden behind the couch.
Exhausted from the ordeal, Lady Divine collapses on a couch and is raped by a giant lobster named Lobstora. In the aftermath (mumbling "You're a maniac now, Divine"), she destroys a car, then wanders Baltimore trying to kill anyone she can.
The film ends with the appearance of the National Guard, which surrounds Lady Divine on the street and shoots her, accompanied by the sound of "America the Beautiful".
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