Origins of the Cybermen (audio story)

 was the first installment of The ArcHive Tapes anthology, narrated and produced by David Banks.

Publisher's summary
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Plot
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Cast
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Continuity

 * The documents cover the origins of the Cybermen on Mondas, (TV: The Tenth Planet) and the divergence between the original Mondasians and the Faction of Planet 14. (TV: The Invasion)