Punishment Of The Krotons

This is the fifth story from Season 17.
==Story==
The Doctor, Macy and Susan arrive on the desolate planet of Gondor, where they discover that the planet's inhabitants are being terrorized by the Krotons, a race of robotic beings who demand that the Gondorians give them a regular supply of raw materials. The Doctor and his companions quickly get involved in the conflict and soon discover that the Krotons are not just demanding raw materials - they are using the planet's resources to build a powerful weapon capable of destroying entire planets. 
==Cast==
The Doctor -Macy Gray -Susan -
==Behind The Scenes==
This episode would be written by