When the TARDIS lands in a quarry on Earth, Sarah unearths what appears to be a fossilised 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...

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Main Cast: Tom Baker, Elisabeth Sladen, Stephen Thorne, Judith Paris, Roy Pattison, Roy Skelton, Rex Robinson, Glyn Houston, Frances Pidgeon, John Cannon

Director: Lennie Mayne

Writers: Dave Martin, Bob Baker

Editor: Christopher Rowlands

Cinematographer:

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