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.

Cast:Jon Pertwee, Katy Manning, Nicholas Courtney, Roger Delgado, Nicholas Pennell, John Ringham,

Genre:Science Fiction, Drama, Adventure,

country:United Kingdom,

Production:BBC,