portrays Duncan in the
1984 film. portrays Duncan in the
Dune miniseries (2000).
Dune At the time of Frank Herbert's original novel
Dune (1965), Idaho is a Swordmaster of the Ginaz in the service of House Atreides and one of
Duke Leto's right-hand men (with
Gurney Halleck and
Thufir Hawat). When the Atreides take over the planet
Arrakis at the order of the
Padishah Emperor Shaddam IV, Idaho becomes Leto's ambassador to the
Fremen, the desert people of Dune that Leto hopes will ally with him in the coming war against the Emperor and the
Harkonnens. Idaho goes to live with the Fremen, serving both Leto and Fremen leader
Stilgar. When the Emperor's dreaded
Sardaukar attack Arrakis in the guise of Harkonnen troops, Idaho initially survives the assault and saves Leto's son
Paul Atreides and
concubine Lady Jessica. When they are cornered at a Botanical Testing Station, Paul and Jessica flee while Idaho holds off the enemy, but he is ultimately killed. and made clear in
Children of Dune (1976) that Idaho had killed an unheard-of tally of nineteen Sardaukar before dying. Although a third party work not connected to the main Dune series, but endorsed by Herbert in his lifetime,
The Dune Encyclopedia provides some background on the characteristics, personalities, and often gruesome deaths of 17 additional Duncans from the time before the Duncan that is the focus of
God Emperor of Dune, further noting that there were "well over seventy Duncans".
Heretics of Dune and Chapterhouse: Dune The Bene Gesserit become the consumers of Idaho gholas in
Heretics of Dune (1984) and
Chapterhouse: Dune (1985). However, the gholas are repeatedly assassinated after several years, and the Sisterhood suspect the Tleilaxu. Not knowing exactly what purpose Idaho will serve, the Bene Gesserit believe that the Tleilaxu are using the gholas to control the timing of his release upon the universe, implying some Tleilaxu purpose in addition to their own. The current ghola survives such an attempt and
Miles Teg is able to restore the memories of Duncan Idaho to the ghola, but Duncan can feel that the Tleilaxu planted something else in his mind. When
Murbella, an
Honored Matre, tries to sexually bind Idaho to her, he entraps and enslaves her, revealing the Tleilaxu purpose: to conquer the Honored Matres by using a better version of their own sexual techniques. When Murbella tries to enslave Duncan, the Tleilaxu's plan comes to fruition, and he becomes aware of the memories of all the other Idaho gholas, though he is also imprinted to her. It is later determined that the Tleilaxu had mixed the cells from almost all of the Idaho gholas to make this one. Idaho and Murbella are confined to a
no-ship on
Chapterhouse. There, Idaho trains young men to go out into the universe and enslave Honored Matres. Duncan also inherits an awkward prescient vision, wherein he sees an
old man and woman staring back at him. Duncan retrieves the Miles Teg ghola, and Sheeana Burg who escape in the no-ship, evading the trap set for him by the strange couple.
Hunters of Dune and Sandworms of Dune Brian Herbert and
Kevin J. Anderson continued from the original series with
Hunters of Dune (2006) and
Sandworms of Dune (2007), originally planned to be
Dune 7 by
Frank Herbert. Duncan continues his travels on the no-ship, now named the
Ithaca by its passengers. He is accompanied by Miles Teg,
Sheeana and a group of her Bene Gesserit sisters, the last
Tleilaxu Master Scytale, and many others. Duncan and the other refugees from Chapterhouse are still on the run from the Unknown Enemy that hunts them. They don't learn until near the end that the Enemy is the revived empire of
thinking machines, and the old couple are actually the computer-entity
Omnius and the robot
Erasmus. In the final confrontation with Omnius,
Paul Atreides (brought back as a
ghola and with his power of
prescience just restored), and then
Norma Cenva (the
Oracle of Time to the
Navigators), both reveal that Duncan is the Ultimate
Kwisatz Haderach; not Paul (who is an "imperfect" Kwisatz Haderach) nor any other Atreides, nor their descendants. Overwhelmed by the unexpected revelations, Duncan decides to unite humanity and the thinking machines—after Cenva permanently removes Omnius from existence—rather than bring about the absolute destruction of intelligent technology for the second time in history. Assuming the responsibility of mediator between the two sides, and with Erasmus' willing participation (the robot being left as the leader and controlling-force of the thinking machines), Duncan does something similar to Bene Gesserit Sharing with the robot; possibly along with what seems to be a physical-bonding (similar to what Leto II did with the
sandtrout) into something of a human-machine hybrid. Erasmus then voluntarily "dies", while remaining an
Other Memory speaking to Duncan. In addition to being the Final Kwisatz Haderach of the humans, Duncan becomes the new evermind of the thinking machines, guiding their joint future.
Prelude to Dune According to the
Prelude to Dune prequel trilogy (1999–2001) by Brian Herbert and Kevin J. Anderson, Duncan Idaho is born on the planet
Giedi Prime, under the Harkonnen Regime. His hatred for the Harkonnens is established when, at eight years of age, his parents are murdered in front of him by
Glossu Rabban. Rabban subsequently chooses young Idaho to be the prey for one of his hunts, but Idaho's resourcefulness and the aid of a woman who wants to punish the Harkonnens enables him to escape Giedi Prime for the planet
Caladan. Upon arriving at the Atreides palace, he becomes a stableboy at
Duke Paulus Atreides' request. After Paulus' death, Idaho expresses his desire to become a Ginaz Swordmaster. In the trilogy's second installment
Dune: House Harkonnen, Duncan undergoes the immense rigors needed to become a Swordmaster; he is promoted to the title, alongside a
Grumman friend named Hiih Resser, and helps defeat a mob of insurgent students. At the time of
Dune: House Corrino, Duncan is an instrumental part of the liberation of the planet
Ix from the Sardaukar and
Tleilaxu, and even manages to defeat
Count Hasimir Fenring in single combat. ==In adaptations==