Link between the Robot and Foundation universes was tightened by letting the robot R Daneel Olivaw - originally introduced in The Caves of Steel - live on for tens of thousands of years and play a major role behind the scenes in both the Galactic Empire in its heyday and in the rise of the two Foundations to take its place.
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Prelude to Foundation Series opens on the planet Trantor, the empire's capital planet, the day after Hari Seldon has given a speech at a mathematics conference.
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Foundation Series's plan is a success; the Foundation remains untouched, and he becomes its effective ruler.
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Meanwhile, the minds of the Foundation Series continue to develop newer and greater technologies which are more compact and powerful than the Empire's equivalents.
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In spite of its undoubted inferiority in purely military terms, the Foundation Series emerges as the victor, and the Empire itself is defeated.
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The Foundation Series comes to realize, too late, that the Mule is unforeseen by Seldon's plan.
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Foundation Series is successful and 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.
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However, as a result, the first Foundation Series learns something of the Second Foundation Series beyond the simple fact that it exists, and has some understanding of its role.
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The Second Foundation Series itself is finally revealed to be located on the former Imperial homeworld of Trantor.
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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 Series still exists and is secretly intervening to bring the plan back on course.
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Meanwhile, Stor Gendibal, a prominent member of the Second Foundation Series, 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 Series can do.
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Foundation Series concludes that a greater force of Mentalics must be active in the Galaxy.
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Foundation Series 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.
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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 Series, which had retained the capacity to research and further develop psychohistory.
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Foundation Series opens a brand new line of thought in the last dozen pages regarding Galaxia, a galaxy inhabited by a single collective mind.
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Foundation Series's Edge takes place 500 years after the establishment of the Foundation Series, outside of the original trilogy of novels.
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Foundation Series 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.
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In 1966, the Foundation trilogy beat several other science fiction and fantasy series to receive a special Hugo Award for "Best All-Time Series".
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The Foundation series was the only series so honored until the establishment of the "Best Series" category in 2017.
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Foundation Series's Edge won Best Novel in 1983, and was a bestseller for almost a year.
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