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...
The Doctor
Sarah Jane Smith
Kastrian Eldrad
Eldrad (female form)
Zazzka
King Rokon
Dr. Carter
Professor Watson
Miss Jackson
Elgin
Abbott
Intern
Guard
Driscoll
