A major sub-plot of the game is inspired by Lovecraft's novella The Shadow Out of Time.
Dark Adventure Radio Theatre: The Shadow Out of Time is a radio drama performed by the H. P. Lovecraft Historical Society, and based on the novella The Shadow Out of Time by H. P. Lovecraft.
The Shadow Out of Time, a 1936 horror novella by American author Howard Phillips Lovecraft
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Tremaine remained editor until 1937, during which time he bought such important stories as H.P. Lovecraft's At the Mountains of Madness (sold by Julius Schwartz) and The Shadow Out of Time (sold by Donald Wandrei), apparently without reading them.
They are mentioned in many of Lovecraft's stories, including At the Mountains of Madness (1936), The Dream-Quest of Unknown Kadath (1926), "The Other Gods" (1933), and The Shadow Out of Time (1936).
In The 4400 episode "Wake Up Call", Tess Doerner bases her description of the future on the city of the Great Race as described in "The Shadow Out of Time."