The blue crystal that the Doctor took from Metebelis III in a previous adventure is desperately sought by the Eight Legs, a race of mutated spiders, as the final element in their plan for universal domination. With help from an old mentor, the Doctor realises the only way to foil the plot is to make the ultimate sacrifice. The Doctor must risk death to return to the cave of the Great One and save the universe.
Cast
Jon Pertwee
The Doctor
Tom Baker
The Doctor
Elisabeth Sladen
Sarah Jane Smith
Nicholas Courtney
Brigadier Lethbridge-Stewart
Richard Franklin
Mike Yates
John Levene
Sergeant Benton
John Dearth
Lupton
Carl Forgione
Land
Andrew Staines
Keaver
Terence Lodge
Moss
Christopher Burgess
Barnes
John Kane
Tommy
Kevin Lindsay
Cho-Je
George Cormack
K'anpo
Cyril Shaps
Professor Clegg
Chubby Oates
Policeman
Pat Gorman
Soldier
Terry Walsh
Man with Boat
Michael Pinder
Hopkins
Stuart Fell
Tramp
Geoffrey Morris
Sabor
Ralph Arliss
Tuar
Gareth Hunt
Arak
Jenny Laird
Neska
Joanna Monro
Rega
Walter Randall
Guard Captain
Max Faulkner
Guard Captain
Ysanne Churchman
Spider Voice
Kismet Delgado
Spider Voice
Maureen Morris
Spider Voice
Crew
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