Foundation series

The Foundation series is a science fiction book series written by American author Isaac Asimov. First collected in 1951, for thirty years the series was a trilogy: Foundation, Foundation and Empire, and Second Foundation. It won the one-time Hugo Award for "Best All-Time Series" in 1966. Asimov began adding new volumes in 1981, with two sequels: Foundation's Edge and Foundation and Earth, and two prequels: Prelude to Foundation and Forward the Foundation. The additions made reference to events in Asimov's Robot and Empire series, indicating that they were also set in the same fictional universe.
The premise of the stories is that, in the waning days of a future Galactic Empire, the mathematician Hari Seldon spends his life developing a theory of psychohistory, a new and effective mathematical sociology. Using statistical laws of mass action, it can predict the future of large populations. Seldon foresees the imminent fall of the Empire, which encompasses the entire Milky Way, and a dark age lasting 30,000 years before a second empire arises. Although the inertia of the Empire's fall is too great to stop, Seldon devises a plan by which "the onrushing mass of events must be deflected just a little" to eventually limit this interregnum to just one thousand years. To implement his plan, Seldon creates the Foundations—two groups of scientists and engineers settled at opposite ends of the galaxy—to preserve the spirit of science and civilization, and thus become the cornerstones of the new galactic empire.
A key feature of Seldon's theory, which has proved influential in real-world social science, is an uncertainty or incompleteness principle: if a population gains knowledge of its predicted behavior, its self-aware collective actions become unpredictable.

Publication history

Original stories

The original trilogy of novels collected a series of eight short stories published in Astounding Magazine between May 1942 and January 1950. According to Asimov, the premise was based on ideas in Edward Gibbon's History of the Decline and Fall of the Roman Empire, and was invented spontaneously on his way to meet with editor John W. Campbell, with whom he developed the concepts of the collapse of the Galactic Empire, the civilization-preserving Foundations, and psychohistory. Asimov wrote these early stories in his West Philadelphia apartment when he worked at the Philadelphia Naval Yard.

''Foundation'' trilogy

The first four stories were collected, along with a new introductory story, and published by Gnome Press in 1951 as Foundation. The later stories were published in pairs by Gnome as Foundation and Empire and Second Foundation, resulting in the "Foundation Trilogy", as the series is still known.

Later sequels and prequels

In 1981, Asimov was persuaded by his publishers to write a fourth book, which became Foundation's Edge.
Four years later, Asimov followed up with yet another sequel, Foundation and Earth, which was followed by the prequels Prelude to Foundation and Forward the Foundation, published after his death in 1992. During the two-year lapse between writing the sequels and prequels, Asimov had tied in his Foundation series with his various other series, creating a single unified universe. The basic link is mentioned in Foundation's Edge: an obscure tradition about a first wave of space settlements with robots and then a second without. The idea is the one developed in Robots of Dawn, which, in addition to showing the way that the second wave of settlements were to be allowed, illustrates the benefits and shortcomings of the first wave of settlements and their so-called C/Fe culture. In this same book, the word psychohistory is used to describe the nascent idea of Seldon's work. Some of the drawbacks to this style of colonization, also called Spacer culture, are also exemplified by the events described in The Naked Sun.

Asimov's ''Foundation'' series novels

Note: This plot outline for the seven novels follows the series' in-universe chronology, which is not the order of publication. After many years as a trilogy comprising "Foundation", "Foundation and Empire", and "Second Foundation", the series was expanded by two prequels and two sequels.

''Prelude to Foundation (1988)''

Prelude to Foundation opens on the planet Trantor, the empire's capital planet, the day after Hari Seldon has given a speech at a mathematics conference. Several parties become aware of the content of his speech. Seldon is hounded by the Emperor and various employed thugs who are working surreptitiously, which forces him into exile. Over the course of the book, Seldon and Dors Venabili, a female companion and professor of history, are taken from location to location by Chetter Hummin who, under the guise of a reporter, introduces them to various Trantorian walks of life in his attempts to keep Seldon hidden from the Emperor.
Throughout their adventures all over Trantor, Seldon continuously denies that psychohistory is a realistic science. Even if feasible, it may take several decades to develop. Hummin, however, is convinced that Seldon knows something, so he continuously presses him to work out a starting point to develop psychohistory.
Eventually, after much traveling and introductions to various, diverse cultures on Trantor, Seldon realizes that using the entire known galaxy as a starting point is too overwhelming; he then decides to use Trantor as a model to work out the science, with a goal of later using the applied knowledge on the rest of the galaxy.

''Forward the Foundation (1993)''

Eight years after the events of Prelude, Seldon has worked out the science of psychohistory and has applied it on a galactic scale. His notability and fame increase and he is eventually promoted to First Minister to the Emperor. As the book progresses, Seldon loses those closest to him, including his wife, Dors Venabili, as his own health deteriorates into old age. Having worked his entire adult life to understand psychohistory, Seldon instructs his granddaughter, Wanda, to set up the Second Foundation.

''Foundation (1951)''

Called forth to stand trial on Trantor for allegations of treason, Seldon explains that his science of psychohistory foresees many alternatives, all of which result in the Galactic Empire eventually falling. If humanity follows its current path, the Empire will fall and 30,000 years of turmoil will overcome humanity before a second Empire arises. However, an alternative path allows for the intervening years to be only one thousand, if Seldon is allowed to collect the most intelligent minds and create a compendium of all human knowledge, entitled Encyclopedia Galactica. The board is still wary but allows Seldon to assemble whomever he needs, provided he and the "Encyclopedists" be exiled to a remote planet, Terminus. Seldon agrees to these terms – and also secretly establishes a second Foundation of which almost nothing is known, which he says is at the "opposite end" of the galaxy.
After fifty years on Terminus, and with Seldon now deceased, the inhabitants find themselves in a crisis. With four powerful planets surrounding their own, the Encyclopedists have no defenses but their own intelligence. At the same time, a vault left by Seldon is due to automatically open. The vault reveals a pre-recorded hologram of Seldon, who informs the Encyclopedists that their entire reason for being on Terminus is a fraud, insofar as Seldon did not actually care whether or not an encyclopedia was created, only that the population was placed on Terminus and the events needed by his calculations were set in motion. In reality, the recording discloses, Terminus was set up to reduce the dark ages from 30,000 years to just one millennium, based on following his calculations. It will develop by facing intermittent and extreme "crises" – known as "Seldon Crises" – which the laws governing psychohistory show will inevitably be overcome, simply because human nature will cause events to fall in particular ways which lead to the intended goal. The recording reveals that the present events are the first such crisis, reminds them that a second foundation was also formed at the "opposite end" of the galaxy, and then falls silent.
The Mayor of Terminus City, Salvor Hardin, proposes to play the planets against each other. His plan is a success; the Foundation remains untouched, and he becomes the effective ruler. Meanwhile, the minds of the Foundation continue to develop newer and greater technologies which are smaller and more powerful than the Empire's equivalents. Using its scientific advantage, Terminus develops trade routes with nearby planets, eventually taking them over when its technology becomes a much-needed commodity. The interplanetary traders effectively become the new diplomats to other planets. One such trader, Hober Mallow, becomes powerful enough to challenge and win the office of Mayor and, by cutting off supplies to a nearby region, also succeeds in adding more planets to the Foundation's control.

''Foundation and Empire (1952)''

An ambitious general of the current Emperor of the Galaxy perceives the Foundation as a growing threat and orders an attack on it, using the Empire's still-mighty fleet of war vessels. The Emperor, initially supportive, becomes suspicious of his general's long-term motive for the attack, and recalls the fleet despite being close to victory. In spite of its undoubted inferiority in purely military terms, the Foundation emerges as the victor and the Empire itself is defeated. Seldon's hologram reappears in the vault on Terminus, and explains to the Foundation that this opening of the vault follows a conflict whose result was inevitable whatever might have been done – a weak Imperial navy could not have attacked them, while a strong navy would have shown itself by its successes to be a direct threat to the Emperor himself and been recalled.
A century later, an unknown outsider called the Mule has begun taking over planets at a rapid pace. The Foundation comes to realize, too late, that the Mule is unforeseen in Seldon's plan, and that the plan cannot have predicted any certainty of defeating him. Toran and Bayta Darell, accompanied by Ebling Mis – the Foundations's greatest psychologist – and a court jester familiar with the Mule named Magnifico, set out to Trantor to find the Second Foundation, hoping to bring an end to the Mule's reign. Mis studies furiously in the Great Library of Trantor to decipher the Second Foundation's location in order to visit it and seek their help. He is successful and also deduces that the Mule's success stems from his being a mutant who is able to change the emotions of others, a power he used to first instill fear in the inhabitants of his conquered planets, then to make his enemies devoutly loyal to him. Mis is killed by Bayta Darell before he can reveal the location, she having realised that Magnifico is in fact the Mule and has been using his gifts to drive Mis forward in his research, so that he can learn the location himself and subjugate the Second Foundation. Dismayed at having made a mistake which allowed Bayta to see through his disguise, the Mule leaves Trantor to rule over his conquered planets while continuing his search.

''Second Foundation (1953)''

As the Mule comes closer to finding it, the mysterious Second Foundation comes briefly out of hiding to face the threat directly. It consists of the descendants of Seldon's psychohistorians. While the first Foundation has developed the physical sciences, the Second Foundation has been developing Seldon's mathematics and the Seldon Plan, along with their own use of mental sciences. The Second Foundation ultimately wears down the Mule, who returns to rule over his kingdom peacefully for the rest of his life, without any further thought of conquering the Second Foundation.
However, as a result, the first Foundation has learned something of the Second Foundation beyond the simple fact that it exists, and has some understanding of its role. This means their behavior will now be chosen in light of that knowledge, and not based on uninformed natural human behavior, which means their behavior will no longer be the natural responses required by the mathematics of the Seldon Plan. This places the Plan itself at great risk. In addition, the first Foundation starts to resentfully consider the other as a rival, and a small group secretly begins to develop equipment for detecting and blocking mental influence in order to detect members of the Second Foundation. After many attempts to infer the Second Foundation's whereabouts from the few clues available, the Foundation is led to believe the Second Foundation is located on Terminus. The Foundation uncovers and destroys a group of fifty members of the Second Foundation and is left believing they have destroyed the Second Foundation. No longer concerned with the perceived threat, their behavior as a society will tend towards those anticipated by the Plan.
In fact the group of fifty were volunteers on Terminus whose role was to be captured and give the impression that they composed the whole of the Second Foundation, so that the Seldon Plan would be able to continue unimpeded. The Second Foundation itself, however, is finally revealed to be located on the former Imperial Homeworld of Trantor. The clue "at Star's End" was not a physical clue, but was instead based on an old saying, "All roads lead to Trantor, and that is where all stars end." Seldon, being a social scientist and not a physical one, placed the two Foundations at "opposite ends" of the galaxy, but in a sociological rather than physical sense. The first Foundation was located on the Periphery of the galaxy, where the Empire's influence was minimal; the Second Foundation was on Trantor, where, even in its dying days, the Empire's power and culture were strongest.

''Foundation's Edge (1981)''

Believing the Second Foundation still exists, young politician Golan Trevize is sent into exile by the current Mayor of the Foundation, Harla Branno, to uncover the Second Foundation; Trevize is accompanied by a scholar named Janov Pelorat. The reason for their belief is that, despite the unforeseeable impact of the Mule, the Seldon Plan still appears to be proceeding in accordance with the statements of Seldon's hologram, suggesting that the Second Foundation still exists and is secretly intervening to bring the plan back on course. After a few conversations with Pelorat, Trevize comes to believe that a mythical planet called Earth may hold the secret to the location. No such planet exists in any database, yet several myths and legends all refer to it, and it is Trevize's belief that the planet is deliberately being kept hidden. Unknown to Trevize and Pelorat, Branno is tracking their ship so that, in the event they find the Second Foundation, the first Foundation can take military or other action.
Meanwhile, Stor Gendibal, a prominent member of the Second Foundation, discovers a simple local on Trantor who has had a very subtle alteration made to her mind, far more delicate than anything the Second Foundation can do. He concludes that a greater force of Mentalics must be active in the Galaxy. Following the events on Terminus, Gendibal endeavors to follow Trevize, reasoning that by doing so, he may find out who has altered the mind of the Trantor native.
Using the few scraps of reliable information within the various myths, Trevize and Pelorat discover a planet called Gaia which is inhabited solely by Mentalics, to such an extent that every organism and inanimate object on the planet shares a common mind. Both Branno and Gendibal, who have separately followed Trevize, also reach Gaia at the same time. Gaia reveals that it has engineered this situation because it wishes to do what is best for humanity but cannot be sure what is best. Trevize's purpose, faced with the leaders of both the First and Second Foundations and Gaia itself, is to be trusted to make the best decision among the three main alternatives for the future of the human race: the First Foundation's path, based on mastery of the physical world and its traditional political organization ; the Second Foundation's path, based on mentalics and probable rule by an elite using mind control; or Gaia's path of absorption of the entire Galaxy into one shared, harmonious living entity in which all beings, and the galaxy itself, would be a part.
After Trevize makes his decision for Gaia's path, the intellect of Gaia adjusts both Branno's and Gendibal's minds so that each believes he or she has succeeded in a significant task. Trevize remains, but is uncertain as to why he is "sure" that Gaia is the correct outcome for the future.

''Foundation and Earth (1986)''

Still uncertain about his decision, Trevize continues on with the search for Earth along with Pelorat and a local of Gaia, advanced in Mentalics, known as Blissenobiarella. Eventually, Trevize finds three sets of coordinates which are very old. Adjusting them for time, he realizes that his ship's computer does not list any planet in the vicinity of the coordinates. When he physically visits the locations, he rediscovers the forgotten worlds of Aurora, Solaria, and finally Melpomenia. After searching and facing different dilemmas on each planet, Trevize still has not discovered any answers.
Aurora and Melpomenia are long deserted, but Solaria contains a small population which is extremely advanced in the field of Mentalics. When the lives of the group are threatened, Bliss uses her abilities to destroy the Solarian who is about to kill them. This leaves behind a small child who will be put to death if left alone, so Bliss makes the decision to keep the child as they quickly escape the planet.
Eventually, Trevize discovers Earth, but it, again, contains no satisfactory answers for him. However, it dawns on Trevize that the answer may not be on Earth, but on Earth's satellite – the Moon. Upon approaching the planet, they are drawn inside the Moon's core, where they meet a robot named R. Daneel Olivaw.
Olivaw explains that he has been instrumental in guiding human history for thousands of years, having provided the impetus for Seldon to create psychohistory and also the creation of Gaia, but is now close to the end of his ability to maintain himself and will cease to function. Despite replacing his positronic brain, he is going to die shortly. He explains that no further robotic brain can be devised to replace his current one, or which will let him continue assisting for the benefit of humanity. However, some additional time can be won to ensure the long term benefit of humanity by merging R. Daniel Olivaw's mind with the organic intellect of a human – in this case, the intellect of the child that the group rescued on Solaria.
Once again, Trevize is put in the position of deciding if having Olivaw meld with the child's superior intellect would be in the best interests of the galaxy. The decision is left ambiguous as it is implied that the melding of the minds may be to the child's benefit, but that she may have sinister intentions about it.

Development and themes

The early stories were inspired by Edward Gibbon's The History of the Decline and Fall of the Roman Empire. The plot of the series focuses on the growth and reach of the Foundation, against a backdrop of the "decline and fall of the Galactic Empire." The themes of Asimov's stories were also influenced by the political tendency in SF fandom, associated with the Futurians, known as Michelism.
The focus of the books is the trends through which a civilization might progress, specifically seeking to analyze their progress, using history as a precedent. Although many science fiction novels such as Nineteen Eighty-Four or Fahrenheit 451 do this, their focus is upon how current trends in society might come to fruition, and act as a moral allegory on the modern world. The Foundation series, on the other hand, looks at the trends in a wider scope, dealing with societal evolution and adaptation rather than the human and cultural qualities at one point in time. In this he followed the model of Thucydides' work, The History of the Peloponnesian War, as he once acknowledged.
Furthermore, the concept of psychohistory, which gives the events in the story a sense of rational fatalism, leaves little room for moralization. Hari Seldon himself hopes that his Plan will "reduce 30,000 years of Dark Ages and barbarism to a single millennium," a goal of exceptional moral gravity. Yet events within it are often treated as inevitable and necessary, rather than deviations from the greater good. For example, the Foundation slides gradually into oligarchy and dictatorship prior to the appearance of the galactic conqueror, known as the Mule, who was able to succeed through the random chance of a telepathic mutation. But, for the most part, the book treats the purpose of Seldon's plan as unquestionable, and that slide as being necessary in it, rather than mulling over whether the slide is, on the whole, positive or negative.
The books also wrestle with the idea of individualism. Hari Seldon's plan is often treated as an inevitable mechanism of society, a vast mindless mob mentality of quadrillions of humans across the galaxy. Many in the series struggle against it, only to fail. However, the plan itself is reliant upon the cunning of individuals such as Salvor Hardin and Hober Mallow to make wise decisions that capitalize on the trends. On the other hand, the Mule, a single individual with mental powers, topples the Foundation and nearly destroys the Seldon plan with his special, unforeseen abilities. To repair the damage the Mule inflicts, the Second Foundation deploys a plan which turns upon individual reactions. Psychohistory is based on group trends and cannot predict with sufficient accuracy the effects of extraordinary, unforeseeable individuals, and as originally presented, the Second Foundation's purpose was to counter this flaw. Later novels would identify the Plan's uncertainties that remained at Seldon's death as the primary reason for the existence of the Second Foundation, which had retained the capacity to research and further develop psychohistory.
Asimov tried unsuccessfully to end the series with Second Foundation. However, because of the predicted thousand years until the rise of the next Empire, the series lacked a sense of closure. For decades, fans pressured him to write a sequel. In 1982, after a 30-year hiatus, Asimov gave in and wrote what was at the time a fourth volume: Foundation's Edge. This was followed shortly thereafter by Foundation and Earth. The story of this volume ties up all the loose ends and brings together all of his Robot, Empire, and Foundation novels into a single story. He also opens a brand new line of thought in the last dozen pages regarding Galaxia, a galaxy inhabited by a single collective mind. This concept was never explored further. According to his widow Janet Asimov, he had no idea how to continue after Foundation and Earth, so he started writing the prequels.

The ''Foundation'' series timeline

Timeline inconsistencies

Early on during Asimov's original world-building of the Foundation universe, he established within the first published stories a chronology placing the tales about 50,000 years into the future from the time they were written. This precept was maintained in the pages of his first novel Pebble in the Sky, wherein Imperial archaeologist Bel Arvardan refers to ancient human strata discovered in the Sirius sector dating back "some 50,000 years". However, when Asimov decided decades later to retroactively integrate the universe of his Foundation and Galactic Empire novels with that of his Robot stories, a number of changes and minor discrepancies surfaced – the character R. Daneel Olivaw was established as having existed for some 20,000 years, with the original Robot novels featuring the character occurring not more than a couple of millennia after the early-21st century Susan Calvin short stories. Also, in Foundation's Edge, mankind was referred to as having possessed interstellar space travel for only 22,000 years, a far cry from the 50 millennia of earlier works.
In the spring of 1955, Asimov published an early timeline in the pages of Thrilling Wonder Stories magazine based upon his thought processes concerning the Foundation universe's history at that point in his life, which vastly differs from its modern-era counterpart. Many included stories would later be either jettisoned from the later chronology or temporally relocated by the author. Also, the aforementioned lengthier scope of time was changed. For example, in the original 1950s timeline, humanity does not discover the hyperspatial drive until around 5000 AD, whereas in the reincorporated Robot universe chronology, the first interstellar jump occurs in 2029 AD, during the events of I, Robot.

Fictional timeline

Below is a summarized timeline for events detailed in the series. All dates are quoted in Galactic Era and Foundation Era which starts in 12,068 GE.

Cultural impact

Impact in nonfiction

In Learned Optimism, psychologist Martin Seligman identifies the Foundation series as one of the most important influences in his professional life, because of the possibility of predictive sociology based on psychological principles. He also lays claim to the first successful prediction of a major historical event, in the 1988 US elections, and he specifically attributes this to a psychological principle.
In his 1996 book To Renew America, U. S. House Speaker Newt Gingrich wrote how he was influenced by reading the Foundation trilogy in high school.
Paul Krugman, winner of the 2008 Nobel Memorial Prize in Economic Sciences, credits the Foundation series with turning his mind to economics, as the closest existing science to psychohistory.
Businessman and entrepreneur Elon Musk counts the series among the inspirations for his career. When Musk's Tesla Roadster was launched into space on the maiden flight of the Falcon Heavy rocket in February 2018, amongst other items it carried a 5D optical data storage copy of the Foundation series.
Stating that it "offers a useful summary of some of the dynamics of far-flung imperial Rome", Carl Sagan in 1978 listed the Foundation series as an example of how science fiction "can convey bits and pieces, hints and phrases, of knowledge unknown or inaccessible to the reader". In the nonfiction PBS series , Sagan referred to an Encyclopedia Galactica in the episodes "Encyclopaedia Galactica" and "Who Speaks for Earth".


In 1966, the Foundation trilogy beat several other science fiction and fantasy series to receive a special Hugo Award for "Best All-Time Series". The runners-up for the award were Barsoom series by Edgar Rice Burroughs, Future History series by Robert A. Heinlein, Lensman series by Edward E. Smith and The Lord of the Rings by J. R. R. Tolkien. The Foundation series is still the only series so honored. Asimov himself wrote that he assumed the one-time award had been created to honor The Lord of the Rings, and he was amazed when his work won.
The series has won three other Hugo Awards. Foundation's Edge won Best Novel in 1983, and was a bestseller for almost a year. Retrospective Hugo Awards were given in 1996 and 2018 for, respectively, "The Mule" for Best Novel and "Foundation" for Best Short Story.

Impact in fiction and entertainment

Science fiction parodies, such as Douglas Adams' The Hitchhiker's Guide to the Galaxy and Harry Harrison's Bill, the Galactic Hero, often display clear Foundation influences. For instance, "The Guide" of the former is a spoof of the Encyclopedia Galactica, and the series actually mentions the encyclopedia by name, remarking that it is rather "dry", and consequently sells fewer copies than the guide; the latter also features the ultra-urbanized Imperial planet Helior, often parodying the logistics such a planet-city would require, but that Asimov's novel downplays when describing Trantor.
Frank Herbert also wrote Dune as a counterpoint to Foundation. Tim O'Reilly in his monograph on Herbert wrote that "Dune is clearly a commentary on the Foundation trilogy. Herbert has taken a look at the same imaginative situation that provoked Asimov's classic—the decay of a galactic empire—and restated it in a way that draws on different assumptions and suggests radically different conclusions. The twist he has introduced into Dune is that the Mule, not the Foundation, is his hero."
In 1995, Donald Kingsbury wrote "Historical Crisis", which he later expanded into a novel, Psychohistorical Crisis. It takes place about 2,000 years after Foundation, after the founding of the Second Galactic Empire. It is set in the same fictional universe as the Foundation series, in considerable detail, but with virtually all Foundation-specific names either changed, or avoided. The novel explores the ideas of psychohistory in a number of new directions, inspired by more recent developments in mathematics and computer science, as well as by new ideas in science fiction itself.
In 1998, the novel Spectre by William Shatner and Judith and Garfield Reeves-Stevens states that the Mirror Universe divergent path has been studied by the Seldon Psychohistory Institute.
The oboe-like holophonor in Matt Groening's animated television series Futurama is based directly upon the "Visi-Sonor" which Magnifico plays in Foundation and Empire. The "Visi-Sonor" is also mirrored in an episode of Special Unit 2, where a child's television character plays an instrument that induces mind control over children.
During the 2006–2007 Marvel Comics Civil War crossover storyline, in Fantastic Four #542 Mister Fantastic revealed his own attempt to develop psychohistory, saying he was inspired after reading the Foundation series.
According to lead singer Ian Gillan, the hard rock band Deep Purple's song The Mule is based on the Foundation character: "Yes, The Mule was inspired by Asimov. It's been a while but I'm sure you've made the right connection...Asimov was required reading in the 60's."

Radio adaptation

An eight-part radio adaptation of the original trilogy, with sound design by the BBC Radiophonic Workshop, was broadcast on BBC Radio 4 in 1973—one of the first BBC radio drama serials to be made in stereo. A BBC 7 rerun commenced in July 2003.
Adapted by Patrick Tull and Mike Stott, the dramatisation was directed by David Cain and starred William Eedle as Hari Seldon, with Geoffrey Beevers as Gaal Dornick, Lee Montague as Salvor Hardin, Julian Glover as Hober Mallow, Dinsdale Landen as Bel Riose, Maurice Denham as Ebling Mis and Prunella Scales as Lady Callia.

Film adaptation

By 1998, New Line Cinema had spent $1.5 million developing a film version of the Foundation Trilogy. The failure to develop a new franchise was partly a reason the studio signed on to produce The Lord of the Rings film trilogy.
On July 29, 2008, New Line Cinema co-founders Bob Shaye and Michael Lynne were reported to have been signed on to produce an adaptation of the trilogy by their company Unique Pictures for Warner Brothers.
However, Columbia Pictures successfully bid for the screen rights on January 15, 2009, and then contracted Roland Emmerich to direct and produce. Michael Wimer was named as co-producer.
Two years later, the studio hired Dante Harper to adapt the books. This project failed to materialize and HBO acquired the rights when they became available in 2014.

Television series

In November 2014, TheWrap reported that Jonathan Nolan was writing and producing a TV series based on the Foundation Trilogy for HBO. Nolan confirmed his involvement at a Paley Center event on April 13, 2015. In June 2017, Deadline reported that Skydance Media will produce a TV series. In August 2018 it was announced that Apple has commissioned a 10 episode straight-to-series order.
However, on April 18, 2019, Josh Friedman left the project as co-writer and co-showrunner. This was apparently planned, with either Friedman or screenwriter David Goyer leaving and the other staying. On 13 March 2020, Apple suspended all active filming on Apple TV+ shows due to the COVID-19 outbreak.
On June 22, 2020 at Apple Worldwide Developers Conference, Tim Cook announced a TV series for 2021 on Apple TV.

Books within the greater ''Foundation'' series

Merging with other series

The series is set in the same universe as Asimov's first published novel, Pebble in the Sky, although Foundation takes place about 10,000 years later. Pebble in the Sky became the basis for the Empire series. Then, at some unknown date Asimov decided to merge the Foundation/Empire series with his Robot series. Thus, all three series are set in the same universe, giving them a combined length of 18 novels, and a total of about 1,500,000 words. The merge also created a time-span of the series of around 20,000 years.
The stand-alone story Nemesis is also in the same continuity; being referenced in Forward the Foundation, where Hari Seldon refers to a twenty-thousand-year-old story of "a young woman that could communicate with an entire planet that circled a sun named Nemesis." Commentators noted that Nemesis contains barely disguised references to the Spacers and their calendar system, the Galactic Empire and even to Hari Seldon which seem to have been deliberately placed for the purpose of later integration into the Foundation universe.

Asimov's "Author's Note" in ''Prelude to Foundation''

The foreword to Prelude to Foundation contains the chronological ordering of Asimov's science fiction books. Asimov stated that the books of his Robot, Empire, and Foundation series "offer a kind of history of the future, which is, perhaps, not completely consistent, since I did not plan consistency to begin with." Asimov also noted that the books in his list "were not written in the order in which they should be read". In the Author's Note, Asimov noted that there is room for a book between Robots and Empire and The Currents of Space, and that he could follow Foundation and Earth with additional volumes.
Forward the Foundation, Nemesis, and The Positronic Man do not appear in Asimov's list, as they were not yet published at the time, and the order of the Empire novels in Asimov's list is not entirely consistent with other lists. For example, the 1983 Ballantine Books printing of The Robots of Dawn lists the Empire novels as: The Stars, Like Dust, The Currents of Space, and Pebble in the Sky. Given that The Currents of Space includes Trantor and that The Stars, Like Dust does not, these two books possibly were accidentally reversed in Asimov's list.

Asimov's standalone novels set in the ''Foundation'' universe

While not mentioned in the "Author's Note" of Prelude to Foundation, the novels The End of Eternity, Nemesis, and The Positronic Man are related to the greater Foundation series.
The End of Eternity is vaguely referenced in Foundation's Edge, where a character mentions the Eternals, whose "task it was to choose a reality that would be most suitable to Humanity". Asimov himself did not mention The End of Eternity in the series listing from Prelude to Foundation. As for Nemesis, it was written after Prelude to Foundation, but in the author's note Asimov explicitly states that the book is not part of the Foundation or Empire series, but that some day he might tie it to the others.
In Forward the Foundation, Hari Seldon refers to a 20-thousand-year-old story of "a young woman that could communicate with an entire planet that circled a sun named Nemesis", a reference to Nemesis. In Nemesis, the main colony is one of the Fifty Settlements, a collection of orbital colonies that form a state. The Fifty Settlements possibly were the basis for the fifty Spacer worlds in the Robot stories. The implication at the end of Nemesis that the inhabitants of the off-Earth colonies are splitting off from Earthbound humans could also be connected to a similar implication about the Spacers in Mark W. Tiedemann's Robot books. According to Alasdair Wilkins, in a discussion posted on Gizmodo, "Asimov absolutely loves weird, elliptical structures. All three of his non-robot/Foundation science fiction novels — The End of Eternity, The Gods Themselves, and Nemesis — leaned heavily on non-chronological narratives, and he does it with gusto in The Gods Themselves."
In The Robots of Dawn, Dr. Han Fastolfe briefly summarizes the story from The Positronic Man or "The Bicentennial Man" in a conversation with Elijah Baley.

Asimov's novels set in the greater ''Robot''/''Empire''/''Foundation'' universe

The following novels are listed in chronological order by narrative:
  1. I, Robot - a fixup novel composed of 9 short stories about robots, set in the 21st century on Earth
  2. The Positronic Man - a standalone robot novel, co-written with Robert Silverberg, based on Asimov's 1976 novelette "The Bicentennial Man", set from the 22nd to 24th centuries
  3. Nemesis - a standalone novel, set in the 23rd century in a star system about 2 light years from Earth, when interstellar travel was new
  4. The Caves of Steel - first Robot Series/R. Daneel Olivaw novel, set in the 35th century on Earth
  5. The Naked Sun - second Robot Series/R. Daneel Olivaw novel, set in the 35th century on the Spacer planet Solaria
  6. The Robots of Dawn - third Robot Series/R. Daneel Olivaw novel, set in the 35th century on the Spacer planet Aurora
  7. Robots and Empire - fourth Robot Series/R. Daneel Olivaw novel, set in the 37th century on Earth, Solaria, Aurora, and Baleyworld
  8. The Stars, Like Dust - first Empire Series novel, set thousands of years in the future before the founding of a Galactic Empire
  9. The Currents of Space - second Empire Series novel, set thousands of years in the future during Trantor's unification of the galaxy into a Galactic Empire
  10. Pebble in the Sky - third Empire Series novel, primarily set thousands of years in the future on Earth, when the galaxy is unified into a Galactic Empire
  11. Prelude to Foundation - first Foundation Series novel
  12. Forward the Foundation - second Foundation Series novel
  13. Foundation - third Foundation Series novel
  14. Foundation and Empire - fourth Foundation Series novel
  15. Second Foundation - fifth Foundation Series novel
  16. Foundation's Edge - sixth Foundation Series novel
  17. Foundation and Earth - seventh Foundation Series novel
  18. The End of Eternity - a standalone novel, about Eternity, an organization "outside time" which aims to improve human happiness by altering history

    Other authors contributing to the expanded series

Asimov's novels covered only 500 of the expected 1,000 years it would take for the Foundation to become a galactic empire. The novels written after Asimov did not continue the timeline but rather sought to fill in gaps in the earlier stories. The Foundation universe was once again revisited in 1989's Foundation's Friends, a collection of short stories written by many prominent science fiction authors of that time. Orson Scott Card's "The Originist" clarifies the founding of the Second Foundation shortly after Seldon's death; Harry Turtledove's "Trantor Falls" tells of the efforts by the Second Foundation to survive during the sacking of Trantor, the imperial capital and Second Foundation's home; and George Zebrowski's "Foundation's Conscience" is about the efforts of a historian to document Seldon's work following the rise of the Second Galactic Empire.
Also, shortly before his death in 1992, Asimov approved an outline for three novels, known as the Caliban trilogy by Roger MacBride Allen, set between Robots and Empire and the Empire series. The Caliban trilogy describes the terraforming of the Spacer world Inferno, a planet where an ecological crisis forces the Spacers to abandon many long-cherished parts of their culture. Allen's novels echo the uncertainties that Asimov's later books express about the Three Laws of Robotics, and in particular the way a thoroughly roboticized culture can degrade human initiative.
After Asimov's death and at the request of Janet Asimov and the Asimov estate's representative, Ralph Vicinanza approached Gregory Benford, and asked him to write another Foundation story. He eventually agreed, and with Vicinanza and after speaking "to several authors about project", formed a plan for a trilogy with "two hard SF writers broadly influenced by Asimov and of unchallenged technical ability: Greg Bear and David Brin." Foundation's Fear takes place chronologically between part one and part two of Asimov's second prequel novel, Forward the Foundation; Foundation and Chaos is set at the same time as the first chapter of Foundation, filling in background; Foundation's Triumph covers ground following the recording of the holographic messages to the Foundation, and ties together a number of loose ends. These books are now claimed by some to collectively be a "Second Foundation trilogy", although they are inserts into pre-existing prequels and some of the earlier Foundation storylines and not generally recognized as a new Trilogy.
In an epilogue to Foundation's Triumph, Brin noted he could imagine himself or a different author writing another sequel to add to Foundation's Triumph, feeling that Hari Seldon's story was not yet necessarily finished. He later published a possible start of such a book on his website.
More recently, the Asimov estate authorized publication of another trilogy of robot mysteries by Mark W. Tiedemann. These novels, which take place several years before Asimov's Robots and Empire, are Mirage, Chimera, and Aurora. These were followed by yet another robot mystery, Alexander C. Irvine's Have Robot, Will Travel, set five years after the Tiedemann trilogy.
In 2001, Donald Kingsbury published the novel Psychohistorical Crisis, set in the Foundation universe after the start of the Second Empire.
Novels by various authors are loosely connected to the Robot series, but contain many inconsistencies with Asimov's books, and are not generally considered part of the Foundation series.
In November 2009, the Isaac Asimov estate announced the publication of a prequel to I, Robot under the working title Robots and Chaos, the first volume in a prequel trilogy featuring Susan Calvin by fantasy author Mickey Zucker Reichert. The first book was published in November 2011 under the title I, Robot: To Protect, followed by I, Robot: To Obey in 2013 and I, Robot: To Preserve in 2016.

Stories set in the ''Foundation'' universe, including works by other authors

The following works are listed in chronological order by narrative:
2011I, Robot: To ProtectNew prequel I, Robot trilogy by Mickey Zucker Reichert
2013I, Robot: To ObeyNew prequel I, Robot trilogy by Mickey Zucker Reichert
2016I, Robot: To PreserveNew prequel I, Robot trilogy by Mickey Zucker Reichert
11950I, RobotRobot short stories. First collection, which were all included in The Complete Robot, though it also contains a binding text, no longer in The Complete Robot.
1964The Rest of the RobotsIncludes 8 Robot short stories that were not in I, Robot.
1982The Complete RobotCollection of 31 Robot short stories written between 1939 and 1977, including all of the stories in I, Robot and The Rest of the Robots.
1986Robot DreamsIncludes "Robot Dreams" and other short stories.
1990Robot VisionsIncludes "Robot Visions," "Too Bad," "Christmas Without Rodney," and other short stories and essays.
1995GoldA collection of short stories and essays, including robot short stories "Cal" and "Kid Brother".
1993PredatorFirst book of Isaac Asimov's Robots in Time series by author William F. Wu
1993MarauderSecond book of Isaac Asimov's Robots in Time series by author William F. Wu
1993WarriorThird book of Isaac Asimov's Robots in Time series by author William F. Wu
1994DictatorFourth book of Isaac Asimov's Robots in Time series by author William F. Wu
1994EmperorFifth book of Isaac Asimov's Robots in Time series by author William F. Wu
1994InvaderSixth book of Isaac Asimov's Robots in Time series by author William F. Wu
21992The Positronic ManRobot novel based on Asimov's short story "The Bicentennial Man", co-written by Robert Silverberg
31989NemesisThe novel is set in an era in which interstellar travel is in the process of being discovered and perfected.
1948"Mother Earth"Short story set between the early Earth era and the era of the Robot novels, at a time when the Spacer worlds were first being colonised. Contains some minor inconsistencies with later stories. Published in The Early Asimov, or Eleven Years of Trying
41954The Caves of SteelThis is the first of the Robot novels.
51957The Naked SunThe second Robot novel.
1972"Mirror Image"Written after having received numerous requests to continue the story of detective Elijah Baley and his robot partner R. Daneel Olivaw, featured in his earlier novels The Caves of Steel and The Naked Sun. Published in The Complete Robot and later in Robot Visions.
61983The Robots of DawnThe third Robot novel.
Hugo Award nominee, 1984
Locus Award nominee, 1984
1987OdysseyFirst book of Isaac Asimov's Robot City series by Michael P. Kube-McDowell
1987SuspicionSecond book of Isaac Asimov's Robot City series by Mike McQuay
1987CyborgThird book of Isaac Asimov's Robot City series by William F. Wu
1988ProdigyFourth book of Isaac Asimov's Robot City series by Arthur Byron Cover
1988RefugeFifth book of Isaac Asimov's Robot City series by Rob Chilson
1988PerihelionSixth book of Isaac Asimov's Robot City series by William F. Wu
1989ChangelingFirst book of Isaac Asimov's Robots and Aliens series by Stephen Leigh
1989RenegadeSecond book of Isaac Asimov's Robots and Aliens series by Cordell Scotten
1990IntruderThird book of Isaac Asimov's Robots and Aliens series by Robert Thurston
1990AllianceFourth book of Isaac Asimov's Robots and Aliens series by Jerry Oltion
1990MaverickFifth book of Isaac Asimov's Robots and Aliens series by Bruce Bethke
1990HumanitySixth book of Isaac Asimov's Robots and Aliens series by Jerry Oltion
2000MirageRobot Mystery series by Mark W. Tiedemann.
2001ChimeraRobot Mystery series by Mark W. Tiedemann.
2002AuroraRobot Mystery series by Mark W. Tiedemann.
2005Have Robot, Will TravelRobot Mystery series by Alexander C. Irvine.
71985Robots and EmpireThe fourth Robot novel.
Locus Award nominee, 1986
1993Isaac Asimov's CalibanCaliban trilogy by Roger MacBride Allen.
1994Isaac Asimov's InfernoCaliban trilogy by Roger MacBride Allen.
1996Isaac Asimov's UtopiaCaliban trilogy by Roger MacBride Allen.
81951The Stars, Like DustThe first Empire novel.
91952The Currents of SpaceThe second Empire novel.
101950Pebble in the SkyThe third Empire novel; however, it was Asimov's first full novel to be published.
1945"Blind Alley"Short story set in the Foundation universe. Published in the March/1945 issue of Astounding Science Fiction, and later included in the collection The Early Asimov.
111988Prelude to FoundationThis is the first Foundation novel.
Locus Award nominee, 1989
121993Forward the FoundationThe second Foundation novel.
1997Foundation's FearThe first book of the Second Foundation trilogy by Gregory Benford.
1998Foundation and ChaosThe second book of the Second Foundation trilogy by Greg Bear.
1999Foundation's TriumphThe third book of the Second Foundation trilogy by David Brin.
131951FoundationThe third Foundation novel. Actually, it is a collection of four stories, originally published between 1942 and 1944, plus an introductory section written for the book in 1949. Published, slightly abridged, as part of an Ace Double paperback, D-110, with the title The 1000-Year Plan, in 1955.
141952Foundation and EmpireThe fourth Foundation novel, made up of two stories, originally published in 1945. Published with the title The Man Who Upset the Universe as a 35c Ace paperback, D-125, in about 1952.
151953Second FoundationThe fifth Foundation novel, made up of two stories, originally published in 1948 and 1949.
161982Foundation's EdgeThe sixth Foundation novel.
Nebula Award nominee, 1982;
Hugo Award winner, 1983;
Locus Award winner, 1983
171986Foundation and EarthThe seventh Foundation novel.
Locus Award nominee, 1987
1989Foundation's FriendsFoundation's Friends, Stories in Honor of Isaac Asimov is a 1989 anthology of short stories set in the timeline of the greater Foundation series. It was edited by Martin H. Greenberg, with contributing authors including Ray Bradbury, Robert Silverberg, Frederik Pohl, Poul Anderson, Harry Turtledove, and Orson Scott Card.
2001Psychohistorial CrisisPsychohistorical Crisis is a science fiction novel by Donald Kingsbury. An expansion of his 1995 novella "Historical Crisis", it is a re-imagining of the world of Isaac Asimov's Foundation series, set after the establishment of the Second Empire.
181955The End of EternityMembers of the time-changing organization Eternity seek to ensure that their own organization is founded as history says it was, by ensuring the conditions for that event happen as history says they happened. Asimov tied this novel into his broader Foundation Series, by suggesting in Foundation's Edge that it is set in a universe where Eternity had existed but was destroyed by Eternals, resulting in an all-human galaxy.

Major characters in the ''Foundation'' series