When the Master steals the Time Lords' secret file on the Doomsday Weapon, they grant the Doctor a temporary reprieve from his exile on Earth to deal with the crisis. He and Jo arrive on the planet Uxarieus and become enmeshed in a struggle between an agrarian colony and a powerful mining corporation.
Jon Pertwee , Katy Manning , Nicholas Courtney , Roger Delgado , John Ringham , David Webb , Roy Skelton , Helen Worth , John Scott Martin , Pat Gorman
BBC
