Revenge of the Cybermen: The time ring takes the Doctor, Sarah and Harry back to Nerva, but to a period many thousands of years earlier than their previous visit. This is Voga, also known as the planet of gold as that metal can be found in abundance there. The three friends learn that a space plague has killed all but a handful of Nerva's crew. A visiting civilian scientist named Kellman is in fact a traitor working with a group of Cybermen who want to destroy Voga as gold dust can coat their breathing apparatus and suffocate them. Can the Doctor stop them?
Silver Nemesis: The Doctor and Ace visit England in 1988, where three rival factions - the Cybermen, a group of Nazis and a 17th Century sorceress named Lady Peinforte - are attempting to gain control of a statue made of a living metal, validium, that was created by Rassilon as the ultimate defence for Gallifrey. Can the Doctor plays the three factions off against one other and eventually defeat to the Cyber Leader?