Hank Morgan, a 19th-century American engineer, is transported back to medieval England after a blow to the head. Using his modern knowledge, he introduces industrial and social reforms, challenging the feudal system and superstitions of the time. Armed with wit and ingenuity, Hank rises to power, becoming a rival to Merlin and earning the title "The Boss." Twain's satirical tale critiques monarchy, religion, and human folly, blending humor with sharp social commentary. As Hank's innovations clash with Arthurian traditions, the story explores themes of progress, freedom, and the complexities of imposing change on an unprepared society.