When the TARDIS lands in a quarry on Earth, the Doctor and Sarah are caught in a quarrying explosion. Sarah is found clutching what appears to be a fossilized hand, buried in one-hundred-fifty-million-year-old strata. Analysis shows the hand to be silicon-based and inert, but when Sarah begins to act as if possessed, the Doctor suspects that it may still be alive… and it has started to regenerate.

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