Centuries have passed on Dune itself, and the planet is green with life. Leto II, the son of Dune's savior, is still alive but far from human. He has become a human-sandworm creature, ruling over his angry and frustrated empire with his vast legions of Fish Speaker soldiers, enforcing peace for dozens of generations to teach the universe a lesson, while also waiting for the right time to turn Dune back into a desert planet. The fate of all humanity hangs on Leto's awesome sacrifice.