The Shadow Out of Time is a novella by American horror fiction writer H. P. Lovecraft. Written between November 1934 and February 1935, it was first published in the June 1936 issue of Astounding Stories (Link here) .

(source wiki)

Novel by H. P. Lovecraft

Synopsis

The narrative follows a professor who experiences a profound amnesia. As he struggles to reclaim his memories, he is haunted by vivid and disturbing dreams that hint at his past experiences during the time his consciousness was displaced.

Peaslee by M.S.Corley

He unaccountably sees strange vistas of other worlds and of an ancient library city. When he is returned to his own body, he finds that those around him have judged him insane due to the actions of “the other” that possessed his body. While he was experiencing an alien existence in Earth’s ancient past, the “other” occupying his body was experiencing a human one in the present day.

Professor Nathaniel Wingate Peaslee - By miguelzuppo

The narrator at first believes his episode and subsequent dreams to be the product of some kind of mental illness. His initial relief at discovering other cases like his throughout history is withered when he discovers that the other cases are too similar to his own to be without a connection. The narrator’s dreams become more vivid, and he becomes obsessed with archaeology and ancient manuscripts.

The Great Race of Yith by Pahapasi.

His tenuously held sanity is challenged when he discovers the proof he seeks—and that not only do remains of the ancient library still exist on Earth, but also the remain of those who destroyed them…

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EXTRA

The Shadow Out of Time - Graphic novel adaptation by I.N.J. Culbard

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The Shadow Out of Time (DART production) - Radio drama adaptation

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The Shadow Out of Time Short movie adaptation on YT. Collaboration between Richard Svensson (the lone animator), Daniel Lennéer and Christopher Johansson. Åke Rosén stars, and John Hutch narrates.