Jason Momoa's Duncan Idaho may be returning for Dune: Part Three. Idaho first appeared in Dune (2021), which was directed by Denis Villeneuve, who returned to direct Dune: Part Two. Duncan was a warrior who served Duke Leto of House Atreides and became a close friend and ally to the House's heir, Paul Atreides. After the Emperor turned on Leto and his family, Duncan fought to the death to protect Paul and his mother.