Arthur Hiller directs this film version of the popular musical starring Peter O'Toole and Sophia Loren. The film begins in a 17th-century dungeon during the Spanish Inquisition, where Miguel de Cervantes (Peter O'Toole) spends the days writing his famed picaresque tale about his errant knight Don Quixote de la Mancha. Cervantes impersonates his creation and Quixote is seen traveling the Spanish countryside with his loyal servant Sancho Panza (James Coco). He comes across the slutty wench Aldonza (Sophia Loren), whom he mistakes for the pure Dulcinea. He vows eternal devotion to her but as Quixote and Sancho Panza sleep, a band of mule drivers gang rape Aldonza. Quixote's niece Antonia (Julie Gregg) arrives and begs him to return home. But Quixote refuses, determined to drive away the harassing muleteers. However, when they appear to be vanquished, a mysterious Black Knight (John Castle) appears to do battle with Quixote.