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.

Details

Cast

Jon Pertwee

Tom Baker

Elisabeth Sladen

Nicholas Courtney

Richard Franklin

John Levene

John Dearth

Carl Forgione

Andrew Staines

Terence Lodge