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...
Tom Baker
as The Doctor
Elisabeth Sladen
as Sarah Jane Smith
Stephen Thorne
as Kastrian Eldrad
Judith Paris
as Eldrad (female form)
Roy Pattison
as Zazzka
Roy Skelton
as King Rokon
Rex Robinson
as Dr. Carter
Glyn Houston
as Professor Watson
Frances Pidgeon
as Miss Jackson
John Cannon
as Elgin
David Purcell
as Abbott
Renu Setna
as Intern
