In Japan, scientifically advanced invaders from the war-destroyed planet Mysteroid cause an entire village to vanish, then send a giant robot out to storm the city by night, after which they request a small patch of land on Earth and the right to marry earthling women, claiming to be pacifists. Mankind must decide whether to capitulate or to resist.

Returning to their lord's castle, samurai warriors Washizu and Miki are waylaid by a spirit who predicts their futures. When the first part of the spirit's prophecy comes true, Washizu's scheming wife, Asaji, presses him to speed up the rest of the spirit's prophecy by murdering his lord and usurping his place. Director Akira Kurosawa's resetting of William Shakespeare's "Macbeth" in feudal Japan is one of his most acclaimed films.