Kevin J. Anderson no relation Leto Atreides
Leto II Atreides () is a fictional character from the Dune universe created by Frank Herbert.  Born at the end of Dune Messiah (1969), Leto is a central character in Children of Dune (1976) and is the title character of God Emperor of Dune (1981). The character is brought back as a ghola in the Brian Herbert/Kevin J. Anderson sequels which conclude the original series, Hunters of Dune (2006) and Sandworms of Dune (2007). Leto also appears as a child in the prequel The Winds of Dune (2009).
Leto is the son of Paul Atreides and his Fremen concubine Chani, and the twin brother of Ghanima. Leto is named for his paternal grandfather Duke Leto I Atreides, who is killed in the Harkonnen invasion of the desert planet Arrakis (Dune) during the events of Dune (1965).  Leto II is the second child of Paul to bear that name, the first having been killed as an infant by the Emperor's Sardaukar in Dune.
Leto is portrayed by James McAvoy in the 2003 miniseries Frank Herbert's Children of Dune.Sequels
More than 1500 years after his death, Leto II is brought back as a ghola on board the no-ship Ithaca in Brian Herbert and Kevin J. Anderson's continuation of the original series, Hunters of Dune (2006).  Even at a very young age, this Leto shows signs that he may be more than he seems. During an assassination attempt, he appears to transform into a small sandworm and defends himself before reverting to an innocent one-year-old. Genetically, he is noted to be very unusual; as he grows older, he displays an uncanny intelligence, but is very withdrawn. The current Duncan ghola notes that it had been cruel to bring Leto back without his twin sister, who had been so much of the original's life.
In the concluding novel Sandworms of Dune (2007), Leto (like Sheeana) can control the worms. After his memories are returned, he leads the seven sandworms being transported on the Ithaca to wreak havoc in Synchrony, homeworld of the thinking machines. At the conclusion of the battle, all seven worms fuse together into one massive worm; Leto steps inside, and they descend below the planet's surface. While it is stated that Leto had foreseen the conflict with Omnius and the thinking machines, the ultimate fate of the Golden Path, or the worms' status on Synchrony, is left open.
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