"It is the year 2450 and a fragile peace exists between the great empires of Earth and Draconia. The TARDIS materialises aboard on Earth cargo ship which comes under attack. Arrested and accused of espionage, The Doctor is sentenced to life imprisonment on the Moon, but salvation arrives in an unexpected form...
Can The Doctor and Jo stop The Master's plans to provoke a galactic war and reveal the deadly enemy waiting for the chance to destroy both empires?"
Written By: Malcolm Hulke
Directed By: Paul Barnard