The adventures of Don Quixote and Sancho Panza, his squire, featuring the crazy knight on his broken-down old plow-horse, in his rusty armor, his helmet mended with bits of green ribbon, and portly Sancho, faithful, grumbling when hungry, cheerful when fed, shrewd and talkative, jogging behind him on Dapple, his sturdy mule, "the light of his eyes."