A comedic send-up of the grim circumstances of the Middle Ages as told through the story of King Arthur and framed by a modern-day murder investigation. When the mythical king of the Britons leads his knights on a quest for the Holy Grail, they face a wide array of horrors, including a persistent Black Knight, a three-headed giant, a cadre of shrubbery-challenged knights, the perilous Castle Anthrax, a killer rabbit, a house of virgins, and a handful of rude Frenchmen.