Duncan Idaho
Encyclopedia
Duncan Idaho is a fictional character
Fictional character
A character is the representation of a person in a narrative work of art . Derived from the ancient Greek word kharaktêr , the earliest use in English, in this sense, dates from the Restoration, although it became widely used after its appearance in Tom Jones in 1749. From this, the sense of...

 in the Dune universe
Dune universe
Dune is a science fiction franchise which originated with the 1965 novel Dune by Frank Herbert. Considered by many to be the greatest science fiction novel of all time, Dune is frequently cited as the best-selling science fiction novel in history...

 created by Frank Herbert
Frank Herbert
Franklin Patrick Herbert, Jr. was a critically acclaimed and commercially successful American science fiction author. Although a short story author, he is best known for his novels, most notably Dune and its five sequels...

. Introduced in the first novel of the series, 1965's Dune
Dune (novel)
Dune is a science fiction novel written by Frank Herbert, published in 1965. It won the Hugo Award in 1966, and the inaugural Nebula Award for Best Novel...

, the character became a breakout character
Breakout character
A breakout character is a fictional character in different episodes, books or other media that becomes the most popular, talked about, and imitated. Most often a breakout character in a television series captures the audience's imagination and helps to popularize the show, sometimes inadvertently...

 as the readers liked him and was revived by Herbert in 1969's Dune Messiah
Dune Messiah
Dune Messiah is a science fiction novel by Frank Herbert, the second in a series of six novels. It was originally serialized in Galaxy magazine in 1969. The American and British editions have different prologues summarizing events in the previous novel...

. He is the only character to feature in all six of Herbert's original Dune novels.

Idaho was portrayed by Richard Jordan
Richard Jordan
Richard Jordan was an American stage, screen and film actor. A long-time member of the New York Shakespeare Festival, he performed in many Off Broadway and Broadway plays...

 in David Lynch
David Lynch
David Keith Lynch is an American filmmaker, television director, visual artist, musician and occasional actor. Known for his surrealist films, he has developed his own unique cinematic style, which has been dubbed "Lynchian", and which is characterized by its dream imagery and meticulous sound...

's 1984 film version of Dune
Dune (film)
Dune is a 1984 science fiction film written and directed by David Lynch, based on the 1965 Frank Herbert novel of the same name. The film stars Kyle MacLachlan as Paul Atreides, and includes an ensemble of well-known American and European actors in supporting roles. It was filmed at the Churubusco...

, and by James Watson
James Watson (actor)
James "Jimmy" Watson is a British film and television actor.He trained at the Drama Studio London and at the Focus Theatre Studio, Dublin. Started his acting career playing Dr. John McEwan in the Irish television soap opera Fair City in 1988...

 in the 2000 Sci-Fi Channel miniseries
Frank Herbert's Dune
Frank Herbert's Dune is a 2001 3D video game based on the 2000 Sci Fi Channel miniseries of the same name. The game was not a commercial or critical success, and was the last product by Cryo Interactive, which went bankrupt shortly after the game's failure.As Paul, the son of the Duke Atreides's...

. Edward Atterton
Edward Atterton
Edward Atterton is an English actor.Atterton's first television role was in an episode of ITV's Agatha Christie's Poirot in 1993. The same year, he was cast in the recurring role of Dr. Alex Taylor in the ITV drama series Medics...

 assumed the role in the 2003 miniseries Children of Dune.

Description

In Dune
Dune (novel)
Dune is a science fiction novel written by Frank Herbert, published in 1965. It won the Hugo Award in 1966, and the inaugural Nebula Award for Best Novel...

(1965), Duncan is described as a handsome man with "curling black hair" to whom women are easily attracted. Paul Atreides
Paul Atreides
Paul Atreides is a fictional character in the Dune universe created by Frank Herbert. Paul is a prominent character in the first two novels in the series, Dune and Dune Messiah , and returns in Children of Dune . The character is brought back as two different gholas in the Brian Herbert/Kevin J...

 notes Duncan's "dark round face" and "feline movements, the swiftness of reflex that made him such a difficult weapons teacher to emulate." Lady Jessica calls him "the admirable fighting man whose abilities at guarding and surveillance are so esteemed." Duncan is fiercely loyal to House Atreides
House Atreides
House Atreides is a fictional noble family from the Dune universe created by Frank Herbert. One of the Great Houses of the feudal interstellar empire known as the Imperium, its members play a role in every novel in the series. It is suggested within the series that the root of the Atreides line...

, is a skilled pilot, and as a Swordmaster of the Ginaz is a gifted hand-to-hand fighter. In the fight which ends with his death in Dune, Duncan kills an unheard-of 19 Sardaukar
Sardaukar
The Sardaukar are a fictional fanatical army from Frank Herbert's Dune universe, primarily featured in the 1965 science fiction novel Dune, as well as Brian Herbert and Kevin J...

, the Padishah Emperor
Padishah Emperor
Padishah Emperor is the title given to the hereditary rulers of the Old Empire in the science fiction Dune universe created by Frank Herbert.-Original series:...

's fearsome supersoldier
Supersoldier
Supersoldier is a term often used to describe a soldier that operates beyond normal human limits or abilities. Supersoldiers are common in science fiction literature, films, TV programs, computer, conspiracy theories, and video games, but have also made appearances in other related genres, such as...

s. The Sardaukar sell his body to the Tleilaxu; subsequent gholas of Duncan possess the rebellious streak of the original.

In 1976's Children of Dune
Children of Dune
Children of Dune is a 1976 science fiction novel by Frank Herbert, third in a series of six novels set in his Dune universe. Initially selling over 75,000 copies, it became the first hardcover best-seller ever in the science fiction field...

, the Lady Jessica tells Duncan that he was drawn to her daughter Alia
Alia Atreides
Alia Atreides is a fictional character in the Dune universe created by Frank Herbert. Introduced in the first novel of the series, 1965's Dune, the character was originally killed in Herbert's first version of the manuscript. At the suggestion of Analog magazine editor John Campbell, Herbert kept...

 because "you wanted a girl you saw as a younger version of me." In God Emperor of Dune
God Emperor of Dune
God Emperor of Dune is a science fiction novel by Frank Herbert published in 1981, the fourth in the Dune series. It was ranked as the #11 hardcover fiction best seller of 1981 by Publishers Weekly.-Plot introduction:...

(1981), the latest Duncan ghola discovers that one of his predecessors had fathered a child with a woman named Irti who closely resembles Jessica.

The original Idaho

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
Leto Atreides I
Duke Leto Atreides I is a fictional character in the Dune universe created by Frank Herbert. He features in the novel Dune by Frank Herbert and in the Prelude to Dune prequel trilogy by Brian Herbert and Kevin J. Anderson....

's right-hand men (with Gurney Halleck
Gurney Halleck
Gurney Halleck is a fictional troubadour warrior in the Dune universe created by Frank Herbert. He is a major character in Herbert's Dune and Children of Dune , and appears in some of the prequel and sequel novels by Brian Herbert and Kevin J. Anderson.Gurney is portrayed by Patrick Stewart in the...

 and Thufir Hawat
Thufir Hawat
Thufir Hawat is a fictional character in the Dune universe created by Frank Herbert. He is primarily featured in the 1965 novel Dune, but also appears in the Prelude to Dune prequel trilogy by Brian Herbert and Kevin J. Anderson...

). When the Atreides take over the planet Arrakis
Arrakis
Arrakis  — informally known as Dune and later called Rakis — is a fictional desert planet featured in the Dune series of novels by Frank Herbert. Herbert's first novel in the series, 1965's Dune, is popularly considered one of the greatest science fiction novels of all time, and it is...

 at the order of the Padishah Emperor
Padishah Emperor
Padishah Emperor is the title given to the hereditary rulers of the Old Empire in the science fiction Dune universe created by Frank Herbert.-Original series:...

 Shaddam IV
Shaddam Corrino IV
Shaddam Corrino IV is a fictional character in the Dune universe created by Frank Herbert. He is Padishah Emperor of the known universe in Herbert's 1965 novel Dune. Shaddam's accession to the throne is chronicled in the Prelude to Dune prequel trilogy by Brian Herbert and Kevin J. Anderson.Born...

, Idaho becomes Leto's ambassador to the Fremen
Fremen
The Fremen are a group of people in the fictional Dune universe created by Frank Herbert. First appearing in the 1965 novel Dune, the Fremen inhabit the desert planet Arrakis and are based on the desert-dwelling Bedouin and Kalahari Bushmen. In Herbert's novels, Arrakis is the sole known source...

, the desert people of Dune that Leto hopes will ally with him in the coming war against the Emperor and the Harkonnens
House Harkonnen
House Harkonnen is a powerful noble family in Frank Herbert's fictional Dune universe. The Harkonnens are featured prominently in the original 1965 novel Dune, and are also a major presence in both the Prelude to Dune and Legends of Dune prequel trilogies by Brian Herbert and Kevin J. Anderson...

. Idaho goes to live with the Fremen, serving both Leto and Fremen leader Stilgar
Stilgar
Stilgar is a fictional character in the Dune universe created by Frank Herbert. He appears in the first three novels in the series: Dune , Dune Messiah and Children of Dune . His early life is explored in Brian Herbert and Kevin J...

. When the Emperor's dreaded Sardaukar
Sardaukar
The Sardaukar are a fictional fanatical army from Frank Herbert's Dune universe, primarily featured in the 1965 science fiction novel Dune, as well as Brian Herbert and Kevin J...

 attack Arrakis in the guise of Harkonnen troops, Idaho initially survives the assault and saves Leto's son Paul Atreides
Paul Atreides
Paul Atreides is a fictional character in the Dune universe created by Frank Herbert. Paul is a prominent character in the first two novels in the series, Dune and Dune Messiah , and returns in Children of Dune . The character is brought back as two different gholas in the Brian Herbert/Kevin J...

 and concubine
Concubinage
Concubinage is the state of a woman or man in an ongoing, usually matrimonially oriented, relationship with somebody to whom they cannot be married, often because of a difference in social status or economic condition.-Concubinage:...

 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. It is noted in Dune Messiah
Dune Messiah
Dune Messiah is a science fiction novel by Frank Herbert, the second in a series of six novels. It was originally serialized in Galaxy magazine in 1969. The American and British editions have different prologues summarizing events in the previous novel...

(1969) that a "grievous head wound" had caused Idaho's death, and made clear in Children of Dune
Children of Dune
Children of Dune is a 1976 science fiction novel by Frank Herbert, third in a series of six novels set in his Dune universe. Initially selling over 75,000 copies, it became the first hardcover best-seller ever in the science fiction field...

(1976) that Idaho had killed an unheard-of tally of nineteen Sardaukar before dying.

The first Duncan ghola



Idaho returns in Dune Messiah (1969) as a ghola made by the Tleilaxu
Bene Tleilax
The Bene Tleilax or Tleilaxu are an extremely xenophobic and isolationist society in Frank Herbert's science fiction Dune universe. Genetic manipulators who traffic in biological products such as artificial eyes, gholas, and "twisted" Mentats, the Tleilaxu are a major power in the Imperium...

 and gifted to Paul Atreides, now Emperor. The purpose of the gift is 'psychic poison': the ghola, named Hayt, is supposed to tempt the Kwisatz Haderach
Kwisatz Haderach
In Frank Herbert's fictional Dune universe, Kwisatz Haderach is a term which refers to a prophesied messiah and superbeing. In the series, the Bene Gesserit, a matriarchal secret society, hope to create a male who can survive the deadly ritual spice agony that changes a capable female acolyte into...

 Paul into becoming that which he despises. Trained as a Mentat
Mentat
A Mentat is a profession or discipline in Frank Herbert's fictional Dune universe. Mentats are humans trained to mimic computers: human minds developed to staggering heights of cognitive and analytical ability.- Overview :...

 and a Zensunni
Zensunni
The Religions of Dune are a key aspect of the fictional setting of the Dune universe created by Frank Herbert. Many of the names of religions mentioned in the novels indicate they are blends of current belief systems, some syncretic....

 philosopher, Hayt has no memory of his former life, but constantly feels vague hints and reminders of his previous incarnation that make him hope he can recover those memories.

The seemingly harmless dwarf Bijaz recognizes that Hayt is failing to destroy the Emperor psychologically. As the ghola is of Tleilaxu design, Bijaz employs a specific humming intonation that renders Hayt open to implanted commands. Bijaz programs Hayt to kill Paul when he says the words "She is gone," in the depths of grief over the death of his concubine
Concubinage
Concubinage is the state of a woman or man in an ongoing, usually matrimonially oriented, relationship with somebody to whom they cannot be married, often because of a difference in social status or economic condition.-Concubinage:...

 Chani
Chani
Chani is a fictional character featured in Frank Herbert's novels Dune and Dune Messiah . Known mainly as the Fremen wife and legal concubine of protagonist Paul "Muad'Dib" Atreides, Chani is the daughter of Imperial Planetologist Liet-Kynes and his Fremen wife Faroula, and later the mother of...

. But this is only part of the true plan; the emotional distress of the attempt allows Hayt to recover the buried memories of Duncan Idaho, up to and including his death at the hands of the Imperial Sardaukar
Sardaukar
The Sardaukar are a fictional fanatical army from Frank Herbert's Dune universe, primarily featured in the 1965 science fiction novel Dune, as well as Brian Herbert and Kevin J...

. This is the culmination of the Tleilaxu plot, as masterminded by the Face Dancer Scytale
Scytale (Dune)
Scytale is a fictional character in the Dune universe created by Frank Herbert. In the novel Dune Messiah , Scytale is a Tleilaxu Face Dancer who participates in the conspiracy to topple the rule of Paul Atreides. He later returns as a ghola and Tleilaxu Master in Heretics of Dune and...

  to demonstrate to Paul that the Tleilaxu can create for him an exact duplicate of his dead concubine, and lover, Chani but only if he abdicates his throne and relinquishes his CHOAM
CHOAM
The Combine Honnete Ober Advancer Mercantiles is a fictional universal development corporation in Frank Herbert's Dune universe, first mentioned in the 1965 novel Dune...

 holdings. Paul resists the temptation, killing Scytale himself and having Hayt/Duncan kill Bijaz.

Also in Dune Messiah, hints are dropped of a growing attraction between Idaho and Paul's sister, Alia
Alia Atreides
Alia Atreides is a fictional character in the Dune universe created by Frank Herbert. Introduced in the first novel of the series, 1965's Dune, the character was originally killed in Herbert's first version of the manuscript. At the suggestion of Analog magazine editor John Campbell, Herbert kept...

. In one scene, Duncan even kisses Alia, which infuriates her; he replies that he took no more than what was offered. When a blinded Paul abdicates and wanders into the desert to die (as is the tradition for blind Fremen), Alia asks Idaho for his continued support and affection to help her get through the times ahead.

In 1976's Children of Dune, Idaho is now Alia's husband and Mentat. She has assumed power as Holy Regent in the name of Paul's children, Leto II
Leto Atreides II
Leto Atreides II is a fictional character from the Dune universe created by Frank Herbert. Born at the end of Dune Messiah , Leto is a central character in Children of Dune and is the title character of God Emperor of Dune . The character is brought back as a ghola in the Brian Herbert/Kevin J...

 and Ghanima. Alia becomes possessed by the memory-ego of her ancestor, the Baron Vladimir Harkonnen
Vladimir Harkonnen
The Baron Vladimir Harkonnen is a fictional character from the Dune universe created by Frank Herbert. He is primarily featured in the 1965 novel Dune, in which he is the secondary antagonist, and is also a major character in the Prelude to Dune prequel trilogy by Brian Herbert and Kevin J. Anderson...

, who sets out to destroy the Atreides empire. Recognizing this, Idaho remains loyal to the Atreides, and flees to the desert to protect the children. In order to get Stilgar to join the Fremen opposition to Alia's rule, Duncan kills Javid, Alia's secret lover, on the neutral ground of Sietch Tabr. He also insults Stilgar three times, by saying to him the three deadliest insults a Fremen could ever hear: "You wear a collar!", "You are a servant! You've sold Fremen for their water!" and "You have no immortality! None of your descendents carry your blood!" Duncan then allows himself to be struck down by an enraged Stilgar, who realizes afterward that Alia would be forced by political necessity to execute him and his only hope of survival is to join the Fremen rebels — which is what Duncan had planned from the beginning. Duncan's last gasping words were, "Two deaths for the Atreides. The second for no better reason than the first."

The God Emperor's ghola series

God Emperor of Dune
God Emperor of Dune
God Emperor of Dune is a science fiction novel by Frank Herbert published in 1981, the fourth in the Dune series. It was ranked as the #11 hardcover fiction best seller of 1981 by Publishers Weekly.-Plot introduction:...

(1981) reintroduces Idaho as a serial ghola: Leto II has ruled as a sandworm
Sandworm (Dune)
The sandworm is a fictional form of desert-dwelling creature from the Dune universe created by Frank Herbert. They first appear in the 1965 novel Dune, considered to be among the classics in the science fiction genre, and are iconic of the Dune series.In the series, the sandworms called Shai-Hulud...

-human hybrid for 3,500 years, and has continually had an Idaho ghola to serve him. Beyond his personal affection for Idaho, to Leto Idaho represents loyalty, humanity, and the spirit of the unknown, something which the God Emperor, having perfect prescience, knows nothing of. It is also implied that Duncan is needed for Leto's plan for humanity's ultimate survival — called the Golden Path — to come to fruition. However, the Idaho gholas, with their memories restored, struggle to deal with what the Atreides have become. Where before, the hallmark of Atreides rule was justice, Leto's reign has been one of godhood and oppression. Idaho's old-fashioned conscience rebels, leading the Idaho ghola to attempt to kill Leto (who as a sandworm is invulnerable to all but water and extreme violence). Leto notes that only nineteen of "his" Duncans have survived long enough to die what is considered a "natural death." In just about all of these rebellions, the Idaho ghola is killed by the God Emperor. After a certain time, the God Emperor orders another one from the Tleilaxu, or the Tleilaxu themselves just send another one as a token for their security.

The novel chronicles the perceptions and actions of a new Duncan that has just been ordered from the Tleilaxu. Like the others before him, Duncan is appalled at what Atreides rule has become, but Leto appoints him as the head of his otherwise all-female military, the Fish Speakers. Leto also reveals that he has repeatedly used his Duncan gholas in his breeding program to genetically improve the Atreides line. The current Duncan is intended to mate with Siona Atreides, the end product of Leto's breeding program: she is invisible to prescient sight. Duncan is extremely reluctant and protests, saying that he is not Leto's stud. He does catch the eye of Hwi Noree, the Ixian Ambassador sent to Arrakis with the explicit purpose of wooing the Emperor. Leto forbids Duncan from having any relations with her, but he disobeys and sleeps with Hwi.

Duncan eventually joins Siona's rebels and works with her to assassinate Leto. His plan is successful, but Hwi is killed in the process. Leto reveals that he knew of their plan, and that his death is simply another step to ensuring the Golden Path. Siona, having seen the Golden Path during her trial in the desert, realizes she was bred as a key figure for humanity's survival. At the end of the novel, she schemes on how to carefully seduce Duncan and mate with him, as Leto had originally intended. None of their descendants will be able to be tracked by prescience, forever free of any one person's vision and ensuring that humanity could never be completely found and destroyed.

Fifteen hundred years later in Chapterhouse: Dune (1985), the Bene Gesserit Bellonda assesses the many Duncans who came before:
In the original and early gholas, his character had been dominated by impulsiveness. Quick to hate, quick to give loyalty. Later Idaho-gholas tempered this with cynicism but the underlying impulsiveness remained. The Tyrant had called it to action many times. Bellonda recognized a pattern. He can be goaded by pride. His long service to the Tyrant fascinated her. Not only had he been a Mentat several times but there was evidence he had been a Truthsayer in more than one incarnation.

The Bene Gesserit ghola series

The Bene Gesserit become the consumers of Idaho gholas in Heretics of Dune
Heretics of Dune
Heretics of Dune is a 1984 science fiction novel by Frank Herbert, fifth in a series of six novels. It was ranked as the #13 hardcover fiction best seller of 1984 by The New York Times.-Plot introduction:...

(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
Miles Teg
Miles Teg is a fictional character in the Dune universe created by Frank Herbert.-Description:In Heretics of Dune , Miles Teg — the former Supreme Bashar of the Bene Gesserit — is noted to be 296 standard years old and to have a striking resemblance to his ancestor, Leto Atreides I...

 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
Murbella
Murbella is a fictional character in the Dune universe created by Frank Herbert. She appears in Heretics of Dune and Chapterhouse: Dune by Frank Herbert, as well as Hunters of Dune and Sandworms of Dune by Brian Herbert and Kevin J. Anderson.-Storylines:Murbella is raised as an Honored Matre, and...

, an Honored Matre, tries to sexually bond Idaho, 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 bond 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 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 restores the memories of the Miles Teg ghola, and escapes in the no-ship, evading the trap set for him by the strange couple.

Sequels

Brian Herbert
Brian Herbert
Brian Patrick Herbert is an American author who lives in Washington state. He is the elder son of science fiction author Frank Herbert....

 and Kevin J. Anderson
Kevin J. Anderson
Kevin J. Anderson is an American science fiction author with over forty bestsellers. He has written spin-off novels for Star Wars, StarCraft, Titan A.E., and The X-Files, and with Brian Herbert is the co-author of the Dune prequels...

 continued from the original series with Hunters of Dune
Hunters of Dune
Hunters of Dune is the first of two books written by Brian Herbert and Kevin J. Anderson to conclude Frank Herbert's original Dune series of novels....

(2006) and Sandworms of Dune
Sandworms of Dune
Sandworms of Dune is the second of two novels written by Brian Herbert and Kevin J. Anderson to conclude Frank Herbert's original Dune series of novels. They have stated that it is based on notes left behind by Frank Herbert for Dune 7, his own planned seventh novel in the Dune series...

(2007), originally planned to be Dune 7 by Frank Herbert
Frank Herbert
Franklin Patrick Herbert, Jr. was a critically acclaimed and commercially successful American science fiction author. Although a short story author, he is best known for his novels, most notably Dune and its five sequels...

. 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
Bene Tleilax
The Bene Tleilax or Tleilaxu are an extremely xenophobic and isolationist society in Frank Herbert's science fiction Dune universe. Genetic manipulators who traffic in biological products such as artificial eyes, gholas, and "twisted" Mentats, the Tleilaxu are a major power in the Imperium...

 Scytale
Scytale (Dune)
Scytale is a fictional character in the Dune universe created by Frank Herbert. In the novel Dune Messiah , Scytale is a Tleilaxu Face Dancer who participates in the conspiracy to topple the rule of Paul Atreides. He later returns as a ghola and Tleilaxu Master in Heretics of Dune and...

, 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
Thinking machines (Dune)
Thinking machines is a collective term for artificial intelligence in the Dune universe created by Frank Herbert. The Butlerian Jihad a human crusade against thinking machines is an epic turning point in the back-story of the Dune universe...

, and the old couple are actually the computer-entity Omnius and the robot Erasmus. In the final confrontation with Omnius, Paul Atreides
Paul Atreides
Paul Atreides is a fictional character in the Dune universe created by Frank Herbert. Paul is a prominent character in the first two novels in the series, Dune and Dune Messiah , and returns in Children of Dune . The character is brought back as two different gholas in the Brian Herbert/Kevin J...

 (brought back as a ghola and with his power of prescience just-now restored), and then Norma Cenva
Norma Cenva
Norma Cenva is a fictional character from the Dune universe created by Frank Herbert. Mentioned briefly in Herbert's God Emperor of Dune , she plays a large role in the Legends of Dune prequel trilogy written by Brian Herbert and Kevin J. Anderson...

 (the Oracle of Time to the Navigators
Guild Navigator
A Guild Navigator is a fictional humanoid in the Dune universe created by Frank Herbert. Humans mutated through the consumption of and exposure to massive amounts of the spice melange, they are able to use a limited form of prescience to safely navigate interstellar space in a starship called a...

), both reveal that Duncan is the Ultimate Kwisatz Haderach
Kwisatz Haderach
In Frank Herbert's fictional Dune universe, Kwisatz Haderach is a term which refers to a prophesied messiah and superbeing. In the series, the Bene Gesserit, a matriarchal secret society, hope to create a male who can survive the deadly ritual spice agony that changes a capable female acolyte into...

; not Paul 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.

Prequels

According to the Prelude to Dune
Prelude to Dune
Prelude to Dune is a prequel trilogy of novels written by Brian Herbert and Kevin J. Anderson, set in Frank Herbert's Dune universe....

prequel
Prequel
A prequel is a work that supplements a previously completed one, and has an earlier time setting.The widely recognized term was a 20th-century neologism, and a portmanteau from pre- and sequel...

 trilogy
Trilogy
A trilogy is a set of three works of art that are connected, and that can be seen either as a single work or as three individual works. They are commonly found in literature, film, or video games...

 (1999–2001) by Brian Herbert and Kevin J. Anderson, Duncan Idaho is born on the planet Giedi Prime
Giedi Prime
Giedi Prime is a fictional planet in Frank Herbert's 1965 science fiction novel Dune. A planet of Ophiuchi B , it is the homeworld of the vicious House Harkonnen, the sworn enemies of House Atreides.-Description:...

, 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
Glossu Rabban
Glossu Rabban is a fictional character in the science fiction novel Dune by Frank Herbert.The Appendix IV: The Almanak of en-Ashraf Glossu Rabban is a fictional character in the science fiction novel Dune by Frank Herbert.The Appendix IV: The Almanak of en-Ashraf Glossu Rabban is a fictional...

. 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
Caladan
Caladan is a fictional planet in the Dune universe created by Frank Herbert, first mentioned in the 1965 novel Dune.-Overview:Caladan, the third planet of Delta Pavonis, is the ancestral fiefdom of House Atreides, who have ruled it for twenty-six generations, from the ancient Castle 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
Dune: House Harkonnen
Dune: House Harkonnen is a 2000 science fiction novel by Brian Herbert and Kevin J. Anderson, set in the fictional Dune universe created by Frank Herbert. It is the second book in the Prelude to Dune prequel trilogy, which takes place before the events of Frank Herbert's celebrated 1965 novel Dune...

, Duncan undergoes the immense rigors needed to be 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
Dune: House Corrino
Dune: House Corrino is a 2001 science fiction novel by Brian Herbert and Kevin J. Anderson, set in the fictional Dune universe created by Frank Herbert. It is the third book in the Prelude to Dune prequel trilogy, which takes place before the events of Frank Herbert's celebrated 1965 novel Dune...

, Duncan is an instrumental part of the liberation of the planet Ix
Ix (Dune)
Ix is a fictional planet featured in the Dune series of science fiction novels written by Frank Herbert, and derivative works. In Dune it is noted that Ix is classed with the planet Richese as "supreme in machine culture," and that Ixian solido projectors "are commonly considered the best." In...

 from the Sardaukar and Tleilaxu
Bene Tleilax
The Bene Tleilax or Tleilaxu are an extremely xenophobic and isolationist society in Frank Herbert's science fiction Dune universe. Genetic manipulators who traffic in biological products such as artificial eyes, gholas, and "twisted" Mentats, the Tleilaxu are a major power in the Imperium...

, and even manages to defeat Count Hasimir Fenring
Hasimir Fenring
Count Hasimir Fenring is a fictional character in the Dune universe created by Frank Herbert. He is featured in the science fiction novel Dune by Frank Herbert, and is also a key character in the Prelude to Dune trilogy by Brian Herbert and Kevin J...

 in single combat.

Other adaptations

In the 1992 video game Dune
Dune (video game)
Dune is a 1992 video game, based upon Frank Herbert's science fiction novel of the same name. Developed by Cryo Interactive and published by Virgin Interactive, is the first of the Dune computer games. Dune blended adventure with economic and military strategy, and is considered by many the most...

, Duncan is a minor character with whom the player (as Paul Atreides) can interact. At first he gives some gameplay advices, and during most of the game he keeps track of spice production and reports to the player whenever talked to. He is also employed when a shipment of spice is requested by the Emperor, or the player must pay a smuggler.
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