
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...
Cast

Tom Baker
The Doctor

Elisabeth Sladen
Sarah Jane Smith

Stephen Thorne
Kastrian Eldrad

Judith Paris
Eldrad (female form)
Roy Pattison
Zazzka

Roy Skelton
King Rokon
Rex Robinson
Dr. Carter

Glyn Houston
Professor Watson
Frances Pidgeon
Miss Jackson

John Cannon
Elgin
David Purcell
Abbott

Renu Setna
Intern
Robin Hargrave
Guard

Roy Boyd
Driscoll
Crew
Lennie Mayne
Director

Dave Martin
Writer

Bob Baker
Writer

Robert Holmes
Script Editor
Christopher Rowlands
Editor

Philip Hinchcliffe
Producer
Marion McDougall
Production Assistant
Christine Ruscoe
Production Design
Max Samett
Camera Operator
Barbara Lane
Costume Design
Judy Neame
Makeup Artist
Graham Bedwell
Sound
Brian Hiles
Sound
Derek Slee
Lighting Director
Colin Mapson
Visual Effects Designer

Dudley Simpson
Original Music Composer

Max Faulkner
Stunt Coordinator

Dick Mills
Special Sound Effects

Delia Derbyshire
Theme Song Performance
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