Overview

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.

Genres

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

Cyril Shaps

Professor Clegg

Pat Gorman

Soldier

Terry Walsh

Man with Boat

Gareth Hunt

Arak

Jenny Laird

Neska

Max Faulkner

Guard Captain