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100,000 BC, alternatively titled An Unearthly Child and The One In The Stone Age was an adventure recorded and logged by the Doctor's TARDIS, (PROSE: Press Play [+]Loading...["Press Play (short story)"]) detailing the First Doctor's time with the Tribe of Gum. (TV: An Unearthly Child [+]Loading...["An Unearthly Child (TV story)"]) The Thirteenth Doctor watched it while in self-isolation. (PROSE: Press Play [+]Loading...["Press Play (short story)"])